Are there any problems with the Chevy 454?

It fired right up and runs decent. It kinda shakes at idle. can smoke the duallys through 2nd gear. how ever no power under load. it has enough to get where you are going but if there is any hill and you start to give it throttle it starts shaking horribly, seems like the engine is gonna fly apart.

What kind of fuel delivery system does a 454 engine use?

This is an aspirated fuel delivery system with the addition of a mixture control system controlled by the ECM. It is not even close to the ECM used today. This fuel delivery system uses a mechanical fuel pump with the addition of an inline lift pump between this pump and gas tank on some systems to help prevent vapor-lock.

What’s the low rpm on a GMC 454?

At the time this pic was taken I had just started cranking the engine hence the low Volts (9.90) & low rpm (125).The engine started afterward and now have this..

How can I tell if my GMC Truck has a hard start?

The first step in diagnosing a hard start or no start on a GMC or Chevy truck with one of these systems, therefore, would be to check fuel pressure. If fuel pressure is less than the KOEO specification, you need to test the fuel pump and its voltage supply circuit.

What kind of truck is the GMC 454?

I am working on a truck for the inlaws. its a 1991 r3500 gmc (1980’s body style crew cab dually tbi 454 4l80e) Original motor broke the crank and threw 2 rods.

Why is my fuel gauge not working properly?

Fuel gauge troubleshooting begins with isolating the problem either to the gauge, sending unit, fuse or wiring. The most common gauge problems are either a bad ground at the tank, or a sender problem.

What are the symptoms of a bad ignition module?

The following are usually the most common symptoms of a bad spark plug wires, or a bad distributor cap and rotor on this type of GM distributor mounted ignition control module: The car (or truck, or mini-van, or van) starts and runs, but with a misfire. The check engine light is on. Lack of power.

Why are my GM 454 backfires breaking down?

If you see any white stains around the ground bracket, the coil is breaking down due to being over worked ( too long at max voltage). Another thing to check is fuel pressure. The system is already a low pressure system to start with. Unfortunately you have to tee into the pressure feed line to get this info.

Is there an ECM on a 1993 GM 454?

There is No true ECM on the 1993 454. There is a mechanical advance spring set up under the distributor cap. Also, unless the engine system has been updated; there is a vacuum advance unit attached to the metal base under the cap. The top item is to replace ALL the vacuum lines.

I am working on a truck for the inlaws. its a 1991 r3500 gmc (1980’s body style crew cab dually tbi 454 4l80e) Original motor broke the crank and threw 2 rods.

It was seen in the limited-edition 1990 Chevrolet SS pickup truck and the Suburban line. The 454 was built for peak performance, but overheating problems could occur with this engine.

What causes a Chevy 454 engine to overheat?

It was seen in the limited-edition 1990 Chevrolet SS pickup truck and the Suburban line. The 454 was built for peak performance, but overheating problems could occur with this engine. A clogged air filter or intake tube can severely reduce the amount of air that gets to the 454’s engine.

What kind of thermostat does a 454 engine use?

I believe a lot of 454 engine originally came with the 195 thermostat. I bought a new 454 – 450 LS-6 crate engine in 1970 but I forget which thermostat it came with. I ran a 180 in mine

When did the Chevy 7.4 liter 454 come out?

Chevrolet’s 7.4-liter 454 engine was originally manufactured for Corvettes, Chevelles and Camaros from 1970 until the 1974 model year, and it appeared in many heavy-duty trucks until 1996. It was seen in the limited-edition 1990 Chevrolet SS pickup truck and the Suburban line.

What kind of motor does a Chevy 454 have?

Got a gm crate 454 out of a motorhome with only 20k on it. it was a carbed motor. that ran with no issues. I pulled the valve covers and in take, cleanest motor i ever seen. put the tbi intake on it and all the following parts

Where are the plugs on a GM 454?

One needs to remover the Cap and the rotor to get a good look at at things, just be real careful not to pull off any of the plug wires if your not real familiar with the firing order of the cap connections. Then connect a section of vacuum hose to the vacuum assemble, located on the passengers side, right side of the distributor.

Is the Vortec 454 in a 97 Silverado 3500?

I have a 97 silverado 3500 with the vortec 454 in it. It has 200k on it, and has a horrible low throttle input miss and a high idle at times. It is also way down on power and stumbles until you really give it some gas, but even then, you can tell its low on power.

Is there a Vortec 454 fuel pressure regulator?

The vortec 454 does not have the same injectors as the small block vortec. It uses the same type injector LT1 and TPI engines. They are buried under the plenum. Do you have any signs of fuel in vacuum line to the regulator? Does the fuel pressure at idle seem steady?

Are there any problems with the Chevy 454?