454 Tbi Runs Rough

This is a discussion on [SOLVED] 95 Chevy S-10 4. Tail gate is not fixable and bed is rough. 454 And A 4-Speed: 1974 Corvette Jamie Palmer Before you start writing that email telling me I'm wrong on the year, yes, this is a 1974 car, it's just wearing a lot of 1982 parts. GAS MILEAGE. good 700R4 k case trans, 241 transfer case, dr side drop front driveshaft. 7 V8 GM Crate Motor. Engine problems on a 1989 gmc r3500 with a 454 tbi. its like it don't get any gas but when it does it you can put it in neutral and it will run fine but put it back in drive and it will do it agian. The EGR valve was faulty so I replaced it. It runs rich when it is running rough. Find out what the RVP of the fuel in the boat’s fuel tank is. Discuss 1990 TBI 5. Here are some: Stalls at idle, stalls when I put the clutch in, stalls when I turn a corner, misfires, surges, no power, cuts out, no power at top revs, runs rough, etc. You'll find local deals, specs, images, videos, consumer and expert reviews, features, trims, and articles for every turn in your 1500. My son's has a. You crank and crank and crank but it just won't run. I have seen throttle bodys for SBC with everything for 200. Rough Engine Idle. This page describes the installation of a GM HEI (High Energy Ignition) electronic distributor in my '74 Nova with a 350 small block. Cab has typical rust in floors and rockers. Vintage Air climate control. Running very, down on power. 1992 S-10 Pickup V6 4. Replaced the coolant temp. Mine is on a stock 454. I have a 93' Chevy K5 Blazer that developed a cold start issue just recently since the temps have started hitting the 40's at night here in Eastern Washington state. One of the most common problems is likely a rough running or poorly idling engine. Re: 454 on propane vs gasoline thats what im thinking of is getting a large tank and then i dont have to worry as much about running out. i have run these with 750 holly carb and the stock throttle body is rated at 800 i think i could be wronge any way. Rough idle and hesitation sounded like a vacuum problem, so I checked the TBI. Check the choke. After it warms up if it is sitting idling it runs rough as crap and then dies. History: It used to only do it when it got real warm like 200*ish then it would miss and sputter really bad with small throttle inputs but seemed ok if you got on it. 11 to 15 RVP (cool to cold weather) fuel will change from liquid to a vapor at lower fuel temperature than 8 to 10 RVP (warm to hot weather) fuel will. Admitadley, I know little about throttle body injection(TBI). NO scan tool. What Are the Symptoms of a Bad EGR Valve? The most common symptoms of a bad exhaust gas recirculation valve are rough or misfiring idle, detonation, stalling and hard starting. , that only affect the efficiency of the spark, but the. I thought I'd just order a catch all of parts off Amazon prime that it could be and send. TBI is a fuel injection system that uses a pair of injectors mounted in a single housing that is mounted and functions much like a carburetor, except that the injectors replace the venturis, jets, air bleeds, fuel bowls, and floats. Tail gate is not fixable and bed is rough. Once it dies I smell some nasty fart smell or something rotten. Problem is the boat run perfectly for about 20-30 minutes and then starts to loss power, backfires and while not run over approx. Engine Idle Is Too High Vacuum Leak. Worked when it was on the truck, but wouldn't die when the passenger idle screw was turned all the way in, so I thought the metering block was plugged. I am having a terrible time with getting it to idle smooth. I have a 1995 Chevy C3500 crew cab with a 454 and an 4L80-E transmission. All of the sudden one day it was really hard to start then ran fine, the next time I tried to drive it it would start and run for about 4-5 seconds then die. When engine hot on the highway, when second venturi of carb is opened the engine seems to die momentarily. 3 sec 60 ft. correctly, poor throttle response, poor fuel economy etc… Many of these running issues can be solved by a simple adjustment! Aside from being out of adjustment, the TPS can just plain wear out or break internally. You will also need the proper tool to loosen the retaining screws. MERCRUISER HORN WARNING SYSTEMS 90-898301003 JUNE 2007 Page 5 / 10 Models All MEFI-3 V-6 and V-8 Sterndrive and Inboards 4. This is in 5 degree increments, at least, in the case of marine engines prepared by Indmar for Mastercraft, Malibu, Supra/Moomba. Replaced plug wires, plugs, cap, rotary button. Very rough cold idle. I had both replaced, all 4 O2 sensors and the exhaust system as when one of the converters went it wrecked that as well. Carburetor Troubleshooting Guide. 0L) and LO5 (5. Car (or truck or mini-van) seems to run ok above 30 miles and hour but once you come to an idle, the engine barely stays running. What would cause TBI engine to sputter, hesitate, skip and misfire/backfire. TBI throttle body electric fuel injection. I know, im just suggesting. I am so confused with all this. 1994 1500 5. the gauge should be still the same psi. Brian the TBI 454 chip man told me to go with the factory. chevy 454 engine 96-00 model 4 bolt main roller block Remanufactured and Rebuilt Engines for Cars and Trucks. A fuel injector's job is to deliver fuel directly into the engine cylinder through the fuel rail before it is burned during combustion. My 1992 GMC S15 4. I cannot detect any vacuum leaks at carb base, vacuum lines or around intake. I've got a miss and hessitation when accelerating. This system is the equivalent of TPI for the V6 and will increase horsepower and torque by a factor of 20% over TBI. Our technicians tell us that the distributor should be overhauled or replaced to correct this concern. 93' K5 Blazer 5. First used to replace the carburetor in the 1980s as a means of delivering gasoline to the engine, the fuel injection system is an important component in most diesel and petrol vehicles. So, I took the truck to the local shop where I worked a few years ago as a full service attendant while in highschool. i have a 95 z-71 that starts right up but wont stay running! new distribitor rotor,fuel filter,plugs,tbi’s dumping gas. Motor in back of truck not included. Pace Performance Products in Ohio put together a decent upgrade. Runs when gas is poured into the TBI. TBI injectors have their. This is in 5 degree increments, at least, in the case of marine engines prepared by Indmar for Mastercraft, Malibu, Supra/Moomba. Ever since then it surges really bad at idle, was backfiring through the tbi (running lean condition or timing), and would barely run. If required, set the idle adjustment on the carbuetor so that the engine idles smoothly. Connect the vacuum gauge hose as close to the intake manifold as possible and start engine. You really need to get with one of the tuners on this site , datalog and let them help you get your vehicle to run right. Removing Idle Stop Cap from a GM TBI and Adjusting the Idle Set Screw. 454, STOCK engine approx. Print See Figure 1. correctly, poor throttle response, poor fuel economy etc… Many of these running issues can be solved by a simple adjustment! Aside from being out of adjustment, the TPS can just plain wear out or break internally. The guy also tuned up the carb and timed it. Bruce Recently returned from long trip and our 87 Coachmen started running rough under load. so putting it in the bed is out of the question. What Are the Symptoms of a Bad EGR Valve? The most common symptoms of a bad exhaust gas recirculation valve are rough or misfiring idle, detonation, stalling and hard starting. the first thing i found on my 1406 running it on the dyno with 02 sensors in the pipes my car was running right on around 12:1 a/f ratio at wot, but not after dipping extremely rich in the transfer from part throttle to wot. shut it down and walk awy till morning. MERCRUISER HORN WARNING SYSTEMS 90-898301003 JUNE 2007 Page 5 / 10 Models All MEFI-3 V-6 and V-8 Sterndrive and Inboards 4. No MAF sensor or O2 sensors on this TBI 454 engineit's a 1ton. My father in law's '91 Chevy was running poorly, so we put new plugs, wires, cap and rotor on it, and it's running better, but it it still surging at idle. It quit running a month ago first moble mech replaced fuel pump and filter. Troubleshooting your TBI Fuel Injection System Most of the problems encountered while installing your fuel injection system or after a time of operation are very simple. Still no clue what happened before I bought her but we have put over 100 hours on the engine in the past year without a hiccup and the oil is perfect. If I push in the throttle even 1/8th of the way in it just sputters and runs like crap. I have an 88 TBI- 454. Within about 50 miles of home topped off (half tank) with 89 octane to see if it would help. The distributor may develop internal faults. I just serviced about an 03 Model GT5000 tractor, showing over 600 hours on the mete,r original Intek V-twin, original Clamp style filter cover, uses no oil, and runs like a top. also would help out on MPG. chevy forum at Car Dealer Forums; Truck runs great, but recently when the engine comes off the enriching circuit. A lot of the car’s sensors can cause the fuel mixture to be wrong, and one of those is the oxygen sensor. A few weeks after I bought the truck I filled up to go on a long road trip. Have a 1997 engine Mercruiser 5. Paul, thanks for the Hydro-boost tip. The Howell TBI is a fuel injection conversion kit based on a TBI system found on GM 4. A visual inspection showed that new spark plugs, spark plug wires, ignition cap, and rotor have been installed. The availability of TBI spare parts it's an issue. way an engine could run bad. MPG is also down. if its a 350 tbi then it could be the idle air control sensor. Generic TBI Fuel Injection Block Diagram & Acronyms Individual Components and Their Function We have covered the block diagram and acronyms and are now ready to take a look at the function of the individual components, and some general information about them, and how to procure them. Suburban stalling issue. Find out what the RVP of the fuel in the boat's fuel tank is. 3L (W) L35 Engine. Admittedly, this description does not include everyone. This is a discussion on [SOLVED] 95 Chevy S-10 4. MECHANICAL - Rough idle suits strip, oval track or pro- street with auto and 3500 stall. After it warms up if it is sitting idling it runs rough as crap and then dies. Was still running rough after that so I sprayed for vacuum leaks with some WD. GM Throttle Body Injection 1987-93 LO3 (5. The strange thing is, the truck seems to run a little better with the plugs gaped at. 4 454 idels rough Discussion in ' so i need to put the egr. This page is for information about GM Throttle Body Injection EFI swaps. correctly, poor throttle response, poor fuel economy etc… Many of these running issues can be solved by a simple adjustment! Aside from being out of adjustment, the TPS can just plain wear out or break internally. Spectre Performance 4473 - Pulley Set (2) GM Truck 94-96 454 TBI Polished. The voltage should look smooth with no voltage flat spots. Replaced the coolant temp. This kit is one of only two made for Jeeps that can be ordered California smog legal. Fuel Injection – TPI, SFI, TBI, SPFI, MPFI LT1, LS1 Wiring. The EGR valve was faulty so I replaced it. I'm running a Ls2 carburetored motor with Brian Tooley stage 4 cam, ported and polished heads and intake by Kimm Barr in Garland, Texas. when you drive it spits black smoke and smells rich. Ensure you attach your vacuum advance line to the correct port on the EFI unit or you might have some rough idle issues. Have a 1997 engine Mercruiser 5. sensor for $16 and haven't had a problem since. back to the tank or in the engine. I've checked the connectors at the dist and they are plugged in and fine. they are completely random. First thing in the morning, start the engine up and run it for 15 seconds while you listen carefully and memorize the sound and it's intensity. with a 454 c. We Can Promise You the Curb Idle will be Set for a Plug-N-Play Setup. Truck had been overheated several months prior and I assume it was HOT. Find 54 used 1996 Chevrolet C/K 1500 Series as low as $1,895 on Carsforsale. I know, im just suggesting. Z71 with carberated big block 454, 4l60 transmission, new interior, nice stereo system with sub, no a/c but could be installed with custom compressor mount, new 33x12. Rough Idle/Spark Engine is Running. Got to where I was going and back home again. Find 454 Engine in Canada | Visit Kijiji Classifieds to buy, sell, or trade almost anything! New and used items, cars, real estate, jobs, services, vacation rentals and more virtually anywhere in British Columbia. This harness will also work on an `86-93 4. 4 MPI 454 EFI 454 MPI 502 MPI 8. 135K miles. way an engine could run bad. 7 Idle surging,stalling in the alt. I have a 1995 26ft class a Damon Challenger on a Chevy P30 with 454 and TBI. You'll get lots more people looking at your question that have direct experience with this kind of truck. The cap had a crack in it so I suspected it may get worse with heat and I changed it. the first thing i found on my 1406 running it on the dyno with 02 sensors in the pipes my car was running right on around 12:1 a/f ratio at wot, but not after dipping extremely rich in the transfer from part throttle to wot. Admitadley, I know little about throttle body injection(TBI). On our 1992 P30 454 TBI the fuel filter getting stopped up acted that way. 7L) engines. Z71 with carberated big block 454, 4l60 transmission, new interior, nice stereo system with sub, no a/c but could be installed with custom compressor mount, new 33x12. The 90s were some rough years for smog the engines were turds. Now when its cold it runs really rough coughing and sputtering. MegaSquirt Carb to EFI Conversion - Part 1: TBI Fuel Only A bit rough but it idled. Surprise, way smoother idle,cruise, and rediculous throttle response. The distributor may develop internal faults. 00 - exclusions apply - Fast Shipping and 1-2 day delivery. The truck does not miss fire and will run fine once warmed up. i was told if i blocked it off it would run better Jul 16, 2011 at 6:43 PM #12. 7 Idle surging,stalling in the alt. Different owners seem to describe this problem using a variety of expressions. 7L TBI and when I replaced the starter, I found that the knock sensor's ceramic fitting had broken and the wire came off- it was sluggish, but it didn't knock excessively. Re: 88 Chevy K3500 454 TBI. The mechanic found a shorted wire that was preventing the injectors from firing. Need Help with Running Rich It's on top of a 5. Stopped and the whole truck was shaking, reaked like fuel. Congratulations to ThirdGen. 7 bogs/backfires when I give it gas. At some point it will begin to gain power but still runs rough. Check the choke. Keep in mind I do not have a timing light. Carburetor Troubleshooting Guide. The 90s were some rough years for smog the engines were turds. My son's has a. 01-11-2011, 10:13 AM. NO scan tool. 1992 S-10 Pickup V6 4. GM 454 Engine Fuel Systems: The following information hopefully will help those that own and love the classic Coaches and wish to keep them running with the performance they were designed to provide. Unless the bubbling is excessive, continue to let the engine run at idle for a few minutes once it reaches normal operating temperature, then shut it down. A few misfires are to be expected under these conditions, and should cause no major performance problems or significant increase in emissions. Also in 1999 (when mine was made) all fuel inj car and truck motors (the 5. Read all about it and the great details in this issue of High Performance. First used to replace the carburetor in the 1980s as a means of delivering gasoline to the engine, the fuel injection system is an important component in most diesel and petrol vehicles. Just got the MH running a couple of days ago with the rebuilt TBI, and let me tell you, there is a huge difference in the way the engine runs. Lack of power as you accelerate the vehicle down the road. 11 -- -- Host: localhost Database: infovis -- ----- -- Server version 4. 3-liter V6, as well as a 454 (7. 00 in the trader. I drive a 1992 p30 chassis motorhome with a 7. i started it to move the other day and it ran perfect with all throttle input for about 2 minutes. When it runs it runs smoothly, and there is no check engine light lit. Asking for any and all help. 01-03-05 08:29 AM - Post# 587050 In response to streetkit I don't have any specific suggestions for you, but you may want to move/post this in the 88-98 fullsize truck forum. The 90s were some rough years for smog the engines were turds. Topped it off and ran it side to side until all was well and quiet. engine surges, low or lack of. My 1988 chevy pick-up is running bad,its stalling frequent until it gets warmed up good. The fix: Check and repair the cooling system. I had my TBI rebuilt and injectors calibrated by Affordable Fuel Injection ($265) recently. Engine skipped occasionally and would pop-pop-pop under heavy acceleration. Find our best fitting throttle body rebuild kit (tbi)s for your vehicle and enjoy free next day delivery or same day pickup at a store near you!. I have a 88 k3500 with a 454 engine. Really BAD gas mileage. Smoother, quieter, better throttle response, etc. 1 Million parts in stock - Fast Free Shipping on orders over $99. You really need to get with one of the tuners on this site , datalog and let them help you get your vehicle to run right. After you have properly adjusted the stop screw and the TPS you will need to look at the dash pot. CAR RESTORATION HOW TO How to Replace A Distributor Without Going Crazy. Overlooking the basics will leave to frustration and unnecessary time and expense. His hands were always dirty, but the MAP sensor looks old. The 1999 454 MPI which looks brand new with only 22 hours showing on the ECM makes a rather annoying and louder than expected hissing/whistling noise when I get on it. The TPS is used to monitor the position of the throttle butterfly valve. Third Generation F-Body Message Boards. I have a 93' Chevy K5 Blazer that developed a cold start issue just recently since the temps have started hitting the 40's at night here in Eastern Washington state. If you have the throttle just barely open it will smooth out until it upshifts then it does it again until the rpms build. I'm running out of ideas. Each TBI assembly is coated with a long lasting aluminum oxide finish. If your chevy gm tbi is running rich this will help you trouble shoot it and fix it Don't Forget to Subscribe today for more fact or fiction, diy ,how to car repair,spooky or funny videos uploaded. My mechanic thought that would be the case. Further information from the customer indicated that the truck misfired the worse in drive, not overdrive, at light to normal cruise around 2000 rpm to 2500 rpm. 3 plugs don't phase engine much when wires are pulled off one at a time. When it is 75 degrees outside, then that temperature gauge reads about 230 degrees. Find out what the RVP of the fuel in the boat's fuel tank is. 0L with a Ford B303 cam, GT40 heads w/ 1. 05-19-10 02:12 PM - Post# 1917465 In response to mid tenn mike I will be VERY surprised if this ends up solving your problems. 1989 camaro rs 305 TBI shuts off upon acceleration and has terrible lag. Idle Problems With Performance Camshaft I have read almost every article and threads on the Internet about this problem, but haven’t found a working solution for my setup. In most cases this is only done if you have modified the internals of your engine or you have swapped a larger throttle body onto your vehicle. With the ECU, TBI, and ignition setup really all that's left are a couple sensors, which shouldn't be tough. If you suspect that the EGR valve is behind your engine's rough idle condition, this tutorial will help you to troubleshoot it with 2 simple tests. Figured needed new plugs and wires. First things first, your check engine light is on and/or your car is running incorrectly. Now for my question. Ok i have had about 3 different trucks with this engine comb. 1990 1 ton 4x4. 7L TBI Mercruiser with Bravo 3 drive on a Sig 260. I'm thinking of doing the same thing, new 350 in my 91 Sierra 4x4, considering it has 151,000 plus miles on it, mostly hi-way. If low, take it to a mechanic, as repairing or replacing a fuel pressure regular is generally not a DIY job. they are completely random. This electric spark has to happen at exactly the right time or the engine will not run properly. A code 23 indicates the intake air temp reading is lower than expected. I have seen throttle bodys for SBC with everything for 200. I removed the elbow and used some new vacuum hose between the hard plastic line and TBI. Timing chains connect an engine's pistons with the intake and exhaust valves. The TPS is used to monitor the position of the throttle butterfly valve. But still a 5. The cap had a crack in it so I suspected it may get worse with heat and I changed it. if clogged with carbon or not adjusted right it will die. When it runs rough I get alot of black smoke and the plugs when I checked them are covered in black soot. what is the function of the egr valve? Can it be repaired or does it need to be replaced? The engine stalls when putting into gear and runs rough at low speeds. What Causes Backfiring on Acceleration? Backfiring during acceleration occurs when ignition takes place in the intake or exhaust instead of the combustion chamber. It has 200k on it, and has a horrible low throttle input miss and a high idle at times. When I start it in the morning it starts but runs and idles very rough. 454 And A 4-Speed: 1974 Corvette Jamie Palmer Before you start writing that email telling me I’m wrong on the year, yes, this is a 1974 car, it’s just wearing a lot of 1982 parts. It quit running a month ago first moble mech replaced fuel pump and filter. No mileage figures yet, but I expect a slight improvement. I had both replaced, all 4 O2 sensors and the exhaust system as when one of the converters went it wrecked that as well. First thing you do is change the exhaust i used factory headers they came off crate engines. Replaced: Plugs Wires Cap Rotor Coil Coolant temp sensor Cleaned pcv,egr and checked for vacuum leaks Adjusted/advanced timing Removed cat Still have rough idle, and slight smell of unburnt fuel. Admitadley, I know little about throttle body injection(TBI). 4 454 idels rough Discussion in ' so i need to put the egr. It may well be that these events are the hesitation & stumble problems described in this article. As soon as the tach hits 1000 rpm it drops to 400 rpm or less then surges up to 1000 - 1200. When shifting into drive, engine runs at idle rpm, when throttle is pushed down to come off idle, engine coughs & dies. Well that gas is long gone and it still misses. 0L with a Ford B303 cam, GT40 heads w/ 1. 1990 1 ton 4x4. 3L TBI - Idle troubles within the Automotive Support forums, part of the Tech Support Forum category. Troubleshooting your TBI Fuel Injection System Most of the problems encountered while installing your fuel injection system or after a time of operation are very simple. Very rough cold idle. sensor for $16 and haven't had a problem since. I replaced the distributor and it ran again but was cutting out after about 30mim running time, and would not start after running Intel 30 to 45 min. When I start it in the morning it starts but runs and idles very rough. Free shipping for all orders over $75. It will run on 91+ unleaded fuel. im trying to sell this truck, but i cant get it tuned up. BASIC RPM 3200-6700 Strip Oval CD244-11 975900 99250-16 244 252 280 288 106. I own a diesel 80-series land cruiser. 7L TBI and when I replaced the starter, I found that the knock sensor's ceramic fitting had broken and the wire came off- it was sluggish, but it didn't knock excessively. When the motor is cold, it will start right up, but will lump at idle and feel rough because the choke provides a too rich a mizture and overloads the engine to the point where it wants to run rough, almost to the point of stalling. If you have the throttle just barely open it will smooth out until it upshifts then it does it again until the rpms build. Street driven everywhere including at 75 MPH on freeway. Restoring a Holiday Rambler 1988 coach with 454 V8 in P30 chassis. Problem: With the engine running at idle, always when cold, intermittent when hot. 1993 Sunrise motorhome, 454 with TBI unit. i have run these with 750 holly carb and the stock throttle body is rated at 800 i think i could be wronge any way. If you have a scan tool, all you need to do is pull up the TPS voltage data. 454 Runs Rough. The truck runs pretty good. Another question I have on the external fuel pump whith the engine running at half throttle the pump has flow the full 1/4 inch diameter but only flows out about 1/2 inch. When this happens the check engine light comes on. No I don't mean harder plugs, competition coils, lumenition etc. Overlooking the basics will leave to frustration and unnecessary time and expense. Asking for any and all help. Congratulations to ThirdGen. Was still running rough after that so I sprayed for vacuum leaks with some WD. Its fuel injected and my problem is this. how long does your 330l tank last and where did you mount it cause i need my truck bed for a camper and dirtbike and hauling stuff. The third-generation Chevrolet Camaro was introduced for the 1982 model year by Chevrolet. TBI injectors have their. Spectre Performance Pulley Sets are precision engineered from high quality materials to give your engine a clean and professional appearance. 01-11-2011, 10:13 AM. 4 MPI 454 EFI 454 MPI 502 MPI 8. The term has changed a bit over the years in this industry, fuel injection has revolutionized the way consumers, auto racers and hot-rodders devour their horsepower. Bruce Recently returned from long trip and our 87 Coachmen started running rough under load. :grrrrrr:. What complicates a rough idle/misfire condition is having the PCM not register any specific misfire codes. 4 GSI/DP Volvo Penta, 454 engine 1998 27 foot Doral, well last week I idled out of the bay which it ran just fine for about five miles then I pulled back to do a little trolling, after an hour I decided to pick it up and move to another spot and noticed that I couldn't get on plan or accelerate over 2. This harness will also work on an `86-93 4. mc22298 hyd 4 222 232 297 307. TBI is a fuel injection system that uses a pair of injectors mounted in a single housing that is mounted and functions much like a carburetor, except that the injectors replace the venturis, jets, air bleeds, fuel bowls, and floats. The fuel pressure regulator may be operating at low pressure. 1993 Sunrise motorhome, 454 with TBI unit. Just got the MH running a couple of days ago with the rebuilt TBI, and let me tell you, there is a huge difference in the way the engine runs. Great mid range horsepower and torque. The guy also tuned up the carb and timed it. 00 in the trader. 88 k3500 454 tbi ACDelco Plugs Blue. 454 Runs Rough. When first started in cooler weather the engine misfires, runs rough. My 1992 GMC S15 4. The truck runs pretty good. Engine idles rough. with a 454 c. i had to adjust my secondary linkage by bending it in slightly. Install process was very simple for the EFI unit and wiring. Like the title says I have a 87 C30 w/454 TBI and 400th. , that only affect the efficiency of the spark, but the. My TBI 454 has been running rough. With a set of beefy front and rear crossmembers and differential drop brackets, this kit can take what you dish out and ke. NOTE: This tutorial covers the EGR valve of the 1987-1995 throttle body fuel injection (TBI) system of the 4. Find our best fitting throttle body rebuild kit (tbi)s for your vehicle and enjoy free next day delivery or same day pickup at a store near you!. An area often overlooked is the performance of the fuel system not while the engine is running, but when it is shut off. In order to adjust the TPS, you will need a scan tool (or laptop/PC running scan tool software) or a digital volt meter. My 88 didn't have anywhere else to ground other than the thermostat and the wire wasn't long enough anyway so they all went to the thermostat stud. First used to replace the carburetor in the 1980s as a means of delivering gasoline to the engine, the fuel injection system is an important component in most diesel and petrol vehicles. I've got a 92 Blazer 4x4 4.