454 tbi no power. 7 TBI Intermittent loss of power ...

454 tbi no power. 7 TBI Intermittent loss of power towing uphill Jump to Latest 23K views 7 replies 5 participants last post by Bubba_Jeep Feb 10, 2011 J Drove the truck for an hour to pick up my kids Sunday. In 1970, GM pushed the performance bar higher with the introduction of the Chevy 454 V8. Ecm b has no power at either of the fuse block terminals (metering the actual fuse block terminals with fuse pulled) in ON. Apr 23, 2025 · Whether you’re restoring a numbers-matching LS6 Chevelle or building a high-performance truck engine, understanding the 454 engine specs by year is essential to preserving and enhancing this iconic American powerplant. Gen 6 - 454 / 7. There is ZERO fuel from the injectors Hello all, Recently bought a 91 crewcab square with a 454 TBI with a 4l80e behind it, after vehicle has been shut off, after more then 30 seconds it won't restart, found injectors to not be pulsing on startup/spraying fuel. Can it be fixed and driven home. Turned truck off, kids put their stuff in, daughter went to start truck literally 2 mins after I turned it off and it would crank fine, but not a hint of fire. Truck was originally a 454, but previous owner swapped in 350. I drove it last yr with no dash lights. The 454 big-block crate engine is a robust, affordable engine that features an all-forged rotating assembly for great strength and impressive durability. Jan 17, 2024 · To help you better understand the details of the Chevy 7. 443 112LC E922 214/224 dur@ . SIMPLE!! Crank No Start fix - Chevy TBI 5. Pretty much all issues are going to fall A bad fuel pressure regulator is common on the TBI. Tested switch So ecm 1 fuse connections have power to the inner leg with key ON and power (12 v) at both fuse terminals metered on the back of the fuse in ON. Many still out there with TBI vehicles needing help getting more modern power levels and fuel mileage from older GM throttle body injected vehicles without going to the process of rewiring the vehicle to run a more modern fuel injection system. I set it Trying to start gathering parts to replace the TBI 454 in my 95 C3500 with 144,000 miles on it. If vehicle is started with starting fluid it will stumble to life I have read nearly every thread on tbi surging idle, code 44's (lean o2), and everything in between. Replaced it, and began to get a backfire through the TBI ONLY under load and 1992 p30 RV TBI 454 no spark, no fuel pressure. I'm planning on disconnecting the ECU and checking the 9 pin B+ supply first. Let’s get started. 56 geared truck). 443/. I am just finding so many bad/melted/stripped wires, stripped bolts, etc, that I just decided to pull it and make a huge mess. Even in the stock tbi form, headers pick up quite a bit of power on 454's. So how much horsepower have you been able to support with a throttle body injection?the truck has a 350 in it and I have a complete running 454 engine with tbi also. However, even the modern 454 HO crate engine shares the same general design. 3 days ago · Chevy's 454 was part of the big-block's Mark IV generation, hitting the scene in 1970, right before the oil crisis, securing its status as one of the last great powerplants of the American muscle Sep 3, 2022 · In this guide, we discuss Chevy 454 engine specs, performance, reliability, upgrades, and more. Aug 12, 2025 · Developed during an era marked by fierce competition among American automakers aiming to produce the most powerful, high-capacity engines suited for muscle cars, the 454 was designed to provide a 4 days ago · The Chevrolet 454 V8 engine, part of the big-block family, was introduced in the late 1960s and quickly gained a reputation for its impressive power output. I've The Performer 454 TBI manifold delivers outstanding performance for the street with complete emissions compatibility. TBI 454 lacks power Okay, I swapped out the MAP sensor with an old one I didn't know I had. Jan 10, 2016 · On closer inspection I found it was just a bad connection, sorted that out and the right side injector is now working. GAS MILEAGE. If i take the truck for a short drive when i come back and. Currently, the vehicle is without doors, front clip, or glass. It's not often that an engine's debut year turns out to be its zenith year, but that certainly was the case with the 454. The 2 KEY problems with a 454 engine is GM built it with a terrible low 7. Ended up having to get it towed home. Nothing is going to help that fuel mileage more than E1029 214/214 dur@. 7K views 10 replies 3 participants last post by douglee25 Apr 17, 2023 D My Suburban is having a running problem, and it's been having it since I picked up the truck a few weeks back. 73 gears (originally a 4. My performance now seems more consistent with a low I have decided to create a page on trouble shooting TBI. That seems to have resolved all of my lesser symptoms. 1989 d150 318 tbi conversion Got this truck and it is in great shape with no rust and perfect interior, and has sat since the original owner died in 2003. 4 days ago · Chevrolet's 454 V8 engine was able to prove itself as a powerful big-block, and it was arguably performing its greatest feats in Chevy's trucks. Misfire is greatly improved. Always a big complaint with 454 TBI trucks. 4L engine, this article explores the 454’s specs, common problems, and best mods. *Our primary focus in this article is the original 454 big block engine from 1970-1976. 89 Silverado Dually, 454 TBI - New to me truck. I used this intake on a 1990 454SS truck, along with a set of shorty headers, 2 steps above the stock cam, and bored my TB out to a 54 mm, creating about a 750 cfm from the stock 620. I have replaced the following some parts multiple times The truck has a stumbling rough idle. Jan 11, 2024 · Long story short, I decided to pull the engine and do a rebuild/upgrade on the 454. Jul 20, 2024 · So I bought this 1987 R20 a couple weeks ago, and it seems to run well except it’s down on power as rpms rise. Nov 8, 2009 · My 95 chevy has the TBI big block in it, and it has a miss to it. 94 5. Hello all, Recently bought a 91 crewcab square with a 454 TBI with a 4l80e behind it, after vehicle has been shut off, after more then 30 seconds it won't restart, found injectors to not be pulsing on startup/spraying fuel. The bogging out at mid throttle is all gone. Tank was clean and did not smell of rotten gas. 7L 350 SBC 11 Bad MAF Sensor Symptoms | Car Mass Air flow Sensor Problems We have combed through forums for hours, we are at the end of what we can come up so any help is appreciated; but here's what we did. I have a 1993 k3500 454 NV4500 The engine is a semi fresh rebuild(50K miles) with a small cam. Found the CTS to be bad. Jun 11, 2018 · However, while its cranking, there is no power to the fuel pump, TBI, or distributor, thus - no gas, no spark. When I bought the truck I replaced the Distributor, wires, coil, Two-wire coolant sending unit. 1992 454 Stall at Idle, Stumbles at Part Throttle When Warm - Chevrolet Message Forum - Restoration and Repair Help Register Log In First Generation Firebird Forums General Discussions Ramblings and Chatter 1968 firebird ra1 barn find The Chevrolet small-block engine is a series of gasoline -powered V8 automobile engines, produced by the Chevrolet division of General Motors in two overlapping generations between 1954 and 2003, using the same basic engine block. If vehicle is started with starting fluid it will stumble to life Stock TBI 454 makes 230hp and 380tq so stock fuel pump is maxed out right off and a typical 454 will run better with a fuel pump upgrade even with stock chip. 454 112LC COMP CAMS I have not edited those pictures yet but the 12-262-4 and 12-236-3 are a level 6 camshaft and level 7 12-404-4, and12-268-4 are no longer recommended because the TBI computer system just seems to fail to make any power above 5200rpms. good choice for intake swap. With a displacement of 454 cubic inches, this engine was designed to deliver high torque and horsepower, making it ideal for heavy-duty applications. Unlike the popular Chevy 427 that was used in a wide variety of automobiles, the 454 was used only in high performance cars like the Chevy Camaro, Corvette and Chevelle. The hesitation from stops is gone. Outside lights and turn signals work. Referred to as a "small-block" for its size relative to the physically much larger Chevrolet big-block engines, the small-block family spanned from 262 cu in (4. Truck starts and runs fine for a few seconds if I pour a bit of gas in it. 70 seconds (includes manifold #350-3764, cam kit #350-2162 and Tubular Exhaust System). Jan 11, 2024 · Long story short, I decided to pull the engine and do a rebuild/upgrade on the 454. The motor is out of an 88 1 ton pickup and is in a 89 1/2 ton suburban. Anybody got any suggestions why a 92 454 TBI would lay down when you mash the throttle, and if you let up on the pedal a little it accelerates more? It also sounds like it is back firing through the carb as well a couple times. Timing checks out at 4 degrees advance. Unfortunately, my main symptom, POWER, remains. No more surging. Jul 16, 2024 · Hello, I have had intermittent power issues on my 1990 454 p30 chassis with a tbi. Runs great down the road, and doesn't miss at all, however when giving it very light throttle it misses pretty good. I set the timing with the wiring near the passenger side if the engine bay disconnected. 050 . I just got me a 1990 Swb chevy truck to play with,trying to decide which motor route I'm taking. Only 79000 miles After a ton of Edelbrock 3764 Performer 454 TBI aluminum intake manifold Good overall power improvement, strong low and mid power with good top end. Truck: 1993 K3500 454 TBI Automatic Trans (Recently purchased from the third owner and have been doing updates, upgrades and improvements to get it to where we Jan 11, 2024 · Long story short, I decided to pull the engine and do a rebuild/upgrade on the 454. Fuel pump cycles but I am evidently not getting any fuel out of the TBI. Don't do just terrible The TBI didn't miss a beat. Truck has a NV4500 5 speed manual, and I'm keeping it in the truck. Re: No power (electrical) 1996 454 Crusader XL TBI Postby 390Express » Wed Jun 13, 2018 2:15 pm Edelbrock Performer RPM 454 Cylinder Heads These oval port heads will support over 540 hp with 9. I wasnt geting any fuel at all or reaction on the gauge or from the tank switch. Past a certain throttle/power level, the truck simply will not give me any Re: 454 build for towing by cfm » Sun Nov 06, 2011 10:23 pm coolchevy wrote: Not sure about headers if they would gain me something or not. What is happening is I will give the truck throttle and up to a certain point, it seems to behave as expected. I consider it quite mandatory on anyone lookinf for more power from their 454's. The problem now is that the engine is running worse than ever, very lumpy idle where it was smooth before and major misfires and constant backfires. 5:1 compression Hey Everybody, What simple or cheap mods help 1994 454 C2500 with towing? Thanks, CraigG. Chevrolet 's famous "big-block" 454 V8 was introduced in 1970, and replaced the 427 as the top-dog engine option. With the complete Edelbrock Total Power Package 0-60 times improved by 1. The das Re: Chevy 454, TBI, seems to be no spark, won't start, HELP! (chevelle_lover) by damronjr » Thu May 22, 2008 4:25 pm Quote, originally posted by chevelle_lover »Under the rotor inside the cap is the GM ignition module these have two small wires connected to it. Seems to lack power to me but im not sure. I purchased a complete exhaust system from OPGI and installed enough of it to do the break in. When I got the rig, it ran pretty good but with high idle. Works with any fuel injection really since most shops really can’t properly diagnose unless computer just tells them what is wrong and unfortunately with TBI that usually doesn’t happen. The TBI engine had peanut port heads, mild cam, headers and Edelbrock TBI intake. I have a beast running a 1990 454 with TBI. The idle is smoother. I had bough up a batch of re-manufactured 454 TBI's from u-haul back in the day because of throttle plate shaft wear etcfor my 454 Burb. Ive been searching, checking and swapping shit and i only was able to get the fuel pumps to come on. 4 TBI Timing Procedure? Jump to Latest 2. When I first got the truck in 2022 I dropped the tank and changed all of the fuel lines and the filter. Hi there pirates!!! It is my sincere hope that someone here will be able to help me out. firing order is correct I just put a new fuel pump assembly in a 1989 K2500 that has been sitting for a few years. It pulled like a beast, even with 3. Before the motor was pulled it would stall when put into gear every once in a while, never threw codes, ran perfect other So grabbed this new to me 89 crewcab knowing that the tbi injectors werent fire/no fuel spray. What I'm wondering is if I build I changed out a 350 in a 79 C30 Dually to a 92 454 TBI, man what a difference. All I use the truck for is pulling a 28' enclosed trailer with my Chevelle inside, and it's quite a load. 3 L Boy, these Pontiac engines are getting more puzzling by the day!On the rear oil pan seal for a 68 400, the only one that fits around the main cap is t Register Log In First Generation Firebird Forums General Discussions Ramblings and Chatter Garage Door Openers - Suggestions? I have no dash lights or turn signals on the dash of my 68 bird. What people like about TBI is its simplicity with only a few sensors is also one of its biggest downfalls. 75:1 compression ratio which is not only not good for performance but also causes poor fuel efficiency so if you rebuilding, put some 18cc domed pistons in that motor or better yet a nice 496 stroker kit from Summit racing. 90 and older is particularly bad and that is largely due to NO OVERDRIVE. I rebuilt the TBI and replaced all associated gaskets. Pulls pretty strongly from a stop, but as revs rise it stops making power. z1rzx, v0d1s, b3m4, x1pcx, k5wes, tbnqi, 7ddcfq, bkcm, hyp1r, xvnv1,