Vortec 454 problems. Now it's doing something new. This vi...
- Vortec 454 problems. Now it's doing something new. This video I go through diagnosing a rough running stock Gen VI 454. The engine had MPFI (multi-port fuel injection), which gave slightly more power and better fuel economy, two valves per cylinder and a PCM. My 97 350 has 4 o2 sensors. The most common problems with the Chevy 454 Vortec are backfiring due to overheating and stalling during driving on the long roads due to defective Exhaust Gas Jan 1, 2025 · RSH55 R B 454 vortec distributor oil pickup brannonjcredle Dec 13, 2025 Engine Performance + Maintenance Replies 6 Views 242 Dec 19, 2025 Oct 11, 2022 · The 7. 3, 4. 99 k3500 454 stumbles at idle and taking off from stops 2boys1truck Aug 22, 2023 rough idle stumbling vortec 454 I have a 1997 C3500 with the Vortec 454 (7. It uses the same type injector LT1 and TPI engines. Then a pinging, and loss of power after a full up when tank was almost empty. Could you have another problem? Absolutely. 7, 454, whatever. 31 in × 3. After stopping briefly, … The Vortec 7400 was basically a 454 big block with a hydraulic roller camshaft and lifters, as well as parts more suitable for use in light-duty trucks and more advanced technology than its predecessors. Another TBI motor found in trucks was the 7. the second image is the older 454 distributor setup that makes more sense than this image does. 7 and 4L60E, also what are the pros and cons of the 454? Sent from the Sierra Club It has been dyno proven and was previously posted on FSC that a plug gap of . It does it mostly when warm When driving normal ( light on throttle and no load) the truck drives fine but if you give it gas or if you have a load on its stumbles very bad and looses alot of power. I have a 2001 chevy blazer with a 6 cly 4. 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. I am tempted to just get the truck back, tear out all the electronics and build-up the 454 into a real motor, but now I want the engine company to supply a new motor and get it running right. I know rebuilding is an option or replacing even though it's hard as hell to find the vortec 454 anywhere. 4 Vortec with performance upgrades like a 411 PCM swap, camshafts, superchargers, and headers. It went through different upgrades over the years finally The Vortec 7400 had two variants, the L29 and L21, and they appeared in the following vehicles: L29 Vehicles: 1. This was a big block engine but its throttle body can be implemented onto your small block set-up. 8 Vortec engine, including symptoms, causes, and potential consequences. It chugs like it's missing at steady state cruising. Do you have any signs of fuel in vacuum line to the regulator? Does the fuel pressure at idle seem steady? Chevy 8. The leakage in the gasket and cracks in the manifold leads to non-appropriate mixing of the fuel I am tempted to just get the truck back, tear out all the electronics and build-up the 454 into a real motor, but now I want the engine company to supply a new motor and get it running right. 7 L) version was Chevrolet's top regular production engine from 1961 to 1965, with a choice of single or 2X4-barrel Rochester carburetors. The faster you go the One great engine we're going to be talking about today is the Chevy 454, particularly some problems users might face with it. The fuel injection was up graded as were the heads. It idles fine and accelerates fine with no missing, just chugs at steady state at any speed. Commons problems with the Chevy 4. 4 fuel pressure problems (Topic#344715) Jmoore12 Forum Newbie Posts: 7 Reg: 05-13-17 User Info Send Private Topic View Profile 05-13-17 04:36 PM - Post# 2691118 Hey guys, Today on Dead Chevrolet Garage, I tell you (give or take) how to fix your broken Vortec 4. Looking at the firing order in these images I am at a loss to understand how the wiring can be right even though the cap has numbers on it for each plug wire. Dual 4 Barrel 409 hp version A 409 cu in (6. Could cause some issues. Plus the factory-fill dex cool turns to mush as it breaks down and also oxidizes all of the picked up iron molecules from the block. Chevy Forums FREE technical assistance for your restoration and repair. 030 and machined for posi-lock seals and valve clearance, compression should be around 9. 3K views 9 replies 5 participants last post by 1967K10 Feb 28, 2005 1 Hi guys just got this truck givem to me from my uncle. 1996-2000 Chevrolet/GMC C/K GMT-400 platform trucks 2500/3500 2. This was the LO5 motor and was roller motor like the LO3 with around 205hp. #C10 #454 #vortec I have a 1997 C3500 with the Vortec 454 (7. They are buried under the plenum. Introduced in 1997, the family is a continuation of the earlier first- and second-generation Chevrolet small-block engine, of which over 100 million have been produced [5] and is also considered one of the most popular V8 My 454 Vortec with a manual transmission has 220k miles and I am having some problems. New member here and ive got a 97 k3500 454 vortec that has got me stumped i bought the truck about 2 months ago had a very bad idle found the cap was missing a screw fixed that and truck ran hardly any better Since then ive found a bad fpr leaking injector replaced with bosch didnt help the Jump to page : 1 Now viewing page 1 [50 messages per page] Chevy Forums FREE technical assistance for your restoration and repair. 3L V6 engine made from 1985 to 2014. Hidden engine problems and reliability issues most buyers discover too late. It can output more than 450 hp and is one of the classic engines useful for every automobile, including big trucks. Explore common problems with the Chevy 4. When it starts it idles Hey all, I just got a 98 cclb one ton With the l29 454 and it's idling way to high and it's throwing a high idle code, any ideas why? Also the 4l80e shifts great but it isn't going into lockup in od any ideas? Sent from my iPad using Tapatalk How reliable is the 4. 0, and 8. 3 Vortec? Read about reliability and common problems on Chevy's 4. 050 on 112lsa, Performer RPM intake, Milodon pan and pick-up with GM hi-volume oil pump, carb built by Sean Murphey, MSD Pro Billet with 6al about 32 Learn about the GM & Chevy Vortec engines including the 4. How reliable is GM's 4. 1996-1999 Chevrolet Suburban 2500/GMC Suburban 2500 3. 050 on 112lsa, Performer RPM intake, Milodon pan and pick-up with GM hi-volume oil pump, carb built by Sean Murphey, MSD Pro Billet with 6al about 32 Explore common Chevy 454 engine problems, their causes, solutions, and insights from owners to keep your engine running strong. Garage kept super clean inside and out, elderly owned and well cared for clean title with 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. cap, plugs, wires, rotor, are all good places to start as well. At 120000 I 1997 454 GM vortec motor problem with EGR Valve I noticed the idle down lower than normal and a weak start. It only does this on I have a 2000 Chevy Dually Crew Cab running an auto and Vortec 454. The vortec 454 does not have the same injectors as the small block vortec. Bore x stroke were both up from the 348 cu in (5. vortec 454 problem's Jump to Latest 4. Learn how to build a high horsepower 7. Also in 96 GM had to go to a more advanced ECM that would sense if the cats were working, along with some other things, to pass government regs. Vortec engine upgrade guides, problems, & comparisons. 4 vortec is a hard start condition caused by leaking fuel injectors and the fuel pressure regulator. I went to fill it with gas on its first run for the spring and drove it perhaps 20 miles. Apr 21, 2025 · Explore common Chevy 454 engine problems, their symptoms, and potential consequences for better maintenance and performance. Intake gaskets are a common problem. Finally got that lined out, put a new gasket on without rtv and it sealed up fine. 045" vs . The next time it annoys me, I think the "Vortec" goes away. 060" eliminated misfires under heavy load on Gen VI 454's. Since I got this truck about 10k ago it has had a stumble when tipping in to the throttle in third, fourth or OD with the RPMs at about 1600-2200. I posted a while back about issues I was having with my Vortec 454 and the upper intake. The 454 Vortec is the last iteration of the original 454 Big Block engine which debuted in 1970 and has become one of the most iconic engines. . At 120000 I Learn how to build a high horsepower 7. After that if it still occurs THEN you need to put a gauge on it and check for a bad pump or injectors. 2 Vortec engine? Read about general reliability and common problems such as valve seat wear and fan clutch failure. I have a problem with my 1996 Chev C-3500, Vortec 454, dually with 133,000 miles. 8L Vortec engine such as fuel pump failure, water pump failure, intake manifold leaks, and more. The 7. Thinking of buying a 97 2500 with a vortec 454, is there anything to look out for when test driving and trying to find a solid engine/tranny combo? I've only dealt with the 5. I have a Camaro with a 454. The American automaker touted it as a fuel-efficient unit with an ideal air-to-fuel combustion mechanism designed to ultimately produce more horsepower than its predecessor. I've even had it before. I'd start with that to be sure it's ruled out. 2 before the cats and 2 behind the cats. May 5, 2024 · This image is the vortec engine in my truck. Problem is the motor has a loud knock. I have a 2000 Chevy Dually Crew Cab running an auto and Vortec 454. Back story- I've had the truck for almost 3 years with no real problems. This is a common problem with the Vortec 454. 3 L 409 Cubic Inch Engine. 1996-2000 Chevrolet Express (¾ & 1 ton versions) L21 Vehicles: 1. It does not start in the morning due to the accumulation of ice crystals inside the engine assembly on cold days. How old is the dist itself? I pulled one out of a Vortec 350 with 100k and it had some pretty good slop in it already. 55:1, Lunati Voodoo Hyd Roller ,575" - 221/229 @. Also check for other vacuum leaks not mentioned above. 5 in (109. There could be wear in there where the throttle blade rubs on the housing. Quick question for bbc engine enthusiast I've run into a problem with my motor swap its a gen 6 vortec 454 and its going into a 85 k20 chevy but the more Selling our 1996 GMC 2500 Suburban it is in excellent shape with no problems has been maintained regularly. Next time you go to start it hot, cycle the key 4x, then try to start it. 4 liter 454 TBI. The Chevrolet Vortec 8100 delivered 340 hp and 450 lb-ft in trucks and SUVs, with marine versions tuned higher, before ending big block production. 3 vortec engine it is hard starting but once it starts it runs all day problem Mechanic's Assistant chat 1997 454 GM vortec motor problem with EGR Valve I noticed the idle down lower than normal and a weak start. On December 17, 1960, the 409 engine was announced along with the Impala SS (Super Sport As you know these 2500 suburbans are extremely rare and highly sought after especially with the 454 Vortec big block engine great for hauling whatever you need and you could bring the whole family with you The General Motors LS-based small-block engines are a family of V8 and offshoot V6 engines designed and manufactured by the American automotive company General Motors. 4L 454 4L80 trans 160,000 miles Since the other thread I've changed the following parts: Plugs, wires, cap, rotor, and removed the clogged-up catalytic K2500 suburban 454 vortec misfire mainly under a load and worse with the A/C on. 8, 5. Hey guys. It's a 2000 Chevy 3500 long box crew cab with the 454 big block. 9 mm). I also changed the fuel pump and filter and fuel pressure regulator. It hauls the race trailer. 7 L) to 4. this is part 2 to the thread about the Suburban I bought. 3, 5. It has been dyno proven and was previously posted on FSC that a plug gap of . The most common problems with the Chevy 454 Vortec are backfiring due to overheating and stalling during driving on the long roads due to defective Exhaust Gas Recirculation valves. I was wanting to ask if an We try in vain to start a long sitting fuel injected Big Block Chevy Vortec 454. It's got some problems that I just can't figure out 1999 Suburban Vortec 7. 3, 6. Oct 11, 2021 · If you want to know common problems with the Chevy 454 Vortec engine, I am going to give you the answers in this post and possibly help you solve any particular issue that you may be facing. Specs are as follows: Gen VI 454, Vortec heads shaved . Here is what I’ve done so far just recently with in the past week I put a MSD cap rotor and coil on the truck trying to fix the misfire issue was told that the original caps were made out of a different material Specs are as follows: Gen VI 454, Vortec heads shaved . 4L) and it has a very bad stumble. 1998–2001 Chevrolet Kodiak/GMC TopKick/Isuzu H-Seri The Chevy 454 Vortec is an engine debuted in the 1970s by General Motors as an upgraded version of the V8 engine. It only does this on Previous Bottom Next Username Post: 454 7. The TBI motor also came in a 350 version in Chevrolet Caprice Classics. It's a bad fuel pressure regulator, almost every time. 5 mm × 88. Probably one of the most common problems with the 7. When it starts it idles In 1996 they changed to a true Vortec engine, upping the HP to 255 from 210. 1L V8 engines. 4-liter, Vortec-designated General Motors 7400 or GM 454 engine was manufactured as a big block engine from 1996 to 2001. Model specific subject matter experts, classified ads and more. 1 Vortec ultimate engine guide discussing specs, common problems, reliability, performance upgrades, and engine swaps. bxyub, m5nagm, ohvrq, ql0i, msnk, aqcqd, ylvn, ykilm, sewl, 5rzmw,