Common questions

Is there a problem with my 454 engine?

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Is there a problem with my 454 engine?

I have asked a number of people and have been told that it is a motor home issue caused by the dog house engine cover and that the 454 was redesigned around that time to increase engine heat to increase millage. My question remains, is it just my 454 or have other people had the same problem?

Can a 454 be installed in a motorhome?

The 454 installed in motorhomes cannot disappate enough heat leading to overheating climbing grades, hot weather, hauling or just when it seemed like it wanted to! Cracked exhaust headers are way common due to this.

What happens if your O2 sensor is bad?

Sudden decrease in fuel mileage. A defective O2 sensor will likely cause your air-fuel mixture to be too rich and directly affect your fuel economy. Flashing check engine light or malfunction indicator lamp in the vehicle?s dash board. Of course this can happen for other reasons as well (and a defective oxygen sensor is one of them!)

Why does my 454 heater not work in my RV?

We spend a Whole Lot of Time crawling in under around and through that 454… mostly due to heat related issues. The 454 installed in motorhomes cannot disappate enough heat leading to overheating climbing grades, hot weather, hauling or just when it seemed like it wanted to! Cracked exhaust headers are way common due to this.

Where is the O2 oxygen sensor in the engine?

Also, The (O2) Oxygen Sensor is not able to measure the air or the fuel entering the engine. Because, the (O2) Oxygen Sensor is located in the exhaust and that where it reads the actual oxygen content in the exhaust. Depending on the year; make and model of your vehicle you could have anywhere from one to four (O2) Oxygen Sensors.

How does the fuel pump work in a 454 engine?

It pumps fuel to the throttle body and the direct fuel injector system through the fuel supply line and then through an in-line fuel filter. The pump is designed to provide pressurized fuel at 125 kPa (18psi.) A pressure regulator in the TBI keeps fuel available to the injectors at a constant pressure between 62 and 90 kpa. (9 to 13psi.)

What happens if the O2 sensor fails to function?

Finally, if your (O2) sensor fails to function properly; your engine management computer cannot determine the air to fuel ratio. Therefore, the engine is forced to guess how much fuel to use. Resulting, in a polluted engine and a poorly functioning vehicle. It’s true that many of these symptoms could be caused by various problems.

What kind of fuel system did the 1980 Chevy 454 use?

A M4MC or EM4MC carburetor was used on most of the 1980 series engines. This is an aspirated fuel delivery system with the addition of a mixture control system controlled by the ECM.

I have asked a number of people and have been told that it is a motor home issue caused by the dog house engine cover and that the 454 was redesigned around that time to increase engine heat to increase millage. My question remains, is it just my 454 or have other people had the same problem?

What to do if your RV has a 454 problem?

The plug wires burn out from the heat. I was told to get a good set and replace evvery 25000 miles. I figured may I would cut holes in side panels to let the heat out. In aviation we always figured the heat outlet should be twice the inlet size. Good luck. George ▶ Reply Thank you for the comments George.

Why does my 454 spark plug keep failing?

The previous owner told us that there was a small problem, it would “pop back through the carb” under load. I tried lots of things and finally found the culprit. Manifold heat was so hot it would cause failure of the number 7 spark plug boot.

Why does my motor home stall when I Turn on the vacuum?

My motor home has a fuel-efficiency gauge (vacuum meter) and the stalling starts when I enter the yellow to red zone (low vacuum, I guess) and disappears when it is back to the green zone. ▶ Reply It sounds as if it’s the 454 curse to me.

What do you put in the boot of a 454?

The splash shields on the right side of the motor have been removed I assume in an effort to let some of the engine heat escape. I have finally found a way to keep the heat from attacking the boot. I use the heavy duty boot, place it inside of the heat sock (used on race cars and such), and fill the heat sock with silicone designed for wood stoves.

The plug wires burn out from the heat. I was told to get a good set and replace evvery 25000 miles. I figured may I would cut holes in side panels to let the heat out. In aviation we always figured the heat outlet should be twice the inlet size. Good luck. George ▶ Reply Thank you for the comments George.

The previous owner told us that there was a small problem, it would “pop back through the carb” under load. I tried lots of things and finally found the culprit. Manifold heat was so hot it would cause failure of the number 7 spark plug boot.

How big is a pace Arrow 454 engine?

A 1987 Pace Arrow, 34 foot on a P-30 Chassis with a 454 engine. I fought the same type of problem for the better part of a year and a half. Changed the fuel filters, bought a tune up, had fuel tank cleaned etc etc. I finally gave up on the “experts” and did some serious trouble shooting myself, applying some cause and effect reasoning etc.

Is the 454 Ho a big block engine?

Chevrolet Performance’s 454 HO crate engine is a Big-Block bargain – an affordable engine with performance specs that will make you think it’s 1970 all over again.

Can a 454 be used as a diesel?

While you are correct the 454 won’t have the torque of a diesel, it sounds like Dave and Bea have a problem. We had a 91 Pace with the 454, and we could still do 45MPH over the Tehachapi pass in California–a pretty steep, long hill. Sounds to me the engine just needs a good tune-up as suggested by the other posters.

Chevrolet Performance’s 454 HO crate engine is a Big-Block bargain – an affordable engine with performance specs that will make you think it’s 1970 all over again.

How old is a Chevy 454 V-8 engine?

To find out just how much the 30-year-old behemoth could muster, they took it to Westech Performance’s dyno room. Of course, the guys wanted to see what the old iron block had in her, so they ran a baseline test. They left all the original parts in place like the two-barrel carburetor and dilapidated ignition system.

Why does my GM Truck start then die?

He was thinking fuel pump or fuel filter. He was about to take it to a dealer to be checked out when someone told him to turn the key to the on position and leave it there until the dash lights went out then start the truck. He did this and says the truck is running fine now. It reset the security system.

Why does my Chevy 1500 die after idle time?

WHEN YOU LET THE MOTOR WARM UP IT WILL JUST DIE OUT AFTER ABOUT 5 MINUTES IDLE TIME BUT WILL START RIGHT BACK UP THEN DIE AGAIN MAYBE 2 MINUTES LATER. IF I PUT IT RIGHT IN DRIVE AND GO IT WILL RUN FIND UNTIL I HAVE TO STOP THEN IT WILL DIE OUT AGAIN.

Why does my Chevy 1500 die in neutral?

I was wondering if it dies in neutral or park with foot off the brake or only at a stop with brake pedal depressed. If it only dies with brake pedal depressed the problem will lie in the brake booster. Since you’re not stepping on the brake when running down the road, the vehicle runs fine and won’t show a code.

What should I do if my Chevy 1500 dies?

TRIED NEW COOLANT TEMP SENSOR AND NEW IAC ALSO CHANGED THE THROTTLE BODY GASKET AND CLEANED THROTTLE BODY. I HAVE ALSO REMOVED ENGINE GROUND AND SANDED CABLE END AND REINSTALLED. I STILL HAVE A HIGH IDLE AND MOTOR STILL DIES IN GEAR AND WAS WANDERING IF I SHOULD ADRESS THE HIGH IDLE ISSUE FIRST OR JUST KEEP AFTER THE ENGINE DYING.

What’s the problem with my Chevy 1500 4by4?

NO VACUM LEAKS PLUGGED BOOSTER HOSE SHOT CARB CLEANER ON INTAKE BUT SAME PROBLEM.ONCE ENGINE DIES AFTER FIRST COUPLE OF MINUTES IT DIES OUT IN ABOUT 20 SECONDS IF STARTED UP AGAIN IT WILL DO THE SAME THING DIES OUT I N ABOUT 20 SECONDS. I CLEARD THE TROBLE CODE FOR THE TPS AND IT DID NOT COME BACK ON SO NO TROBLE CODES I AM STUMPED………

Why does my car make a rattling noise when I start it?

An engine rattling noise, or a clicking sound in an engine, can spring up from a number of sources. Whether it’s engine knocking when accelerating or some kind of spark knock or just a general engine noise, some are more serious than others, but there’s one thing that’s true of them all: it’s never good to leave it alone.

What should the idle RPM be on a Chevy 454 Eng?

You want the idle to be around 800 to 900 rpm with the vehicle in park and around 700 rpm with the vehicle in neutral. Monitor your tachometer while adjusting. Adjust the idle by sound if you do not have a tachometer. Listen for the engine rpm to drop until just before it starts to sputter.

What kind of engine does a GM 454 have?

Loosing your brakes in the mountains is not when to decide to change the brake fluid. BTW, our Foretravel is a 1993 with 157,000 miles. Joe, as Brett may have already said, Welcome to the Forum. The GM 454 (7.4) is a great engine. The basic engine is a real workhorse.

What was the last year the Chevy 454 was made?

Another big blow for the 454 was the gas crisis of 1973 which pretty much sealed the fate for the motor during this period. The last Chevelles of 1973 used the 454 but by this point the engines had been toned down to a measly 245 horsepower. The Corvette followed suit by the end of 1974 and also bid farewell to this once powerful engine.

What causes idle problems in a 1994 TBI 454?

At speed it runs fine, but when droping down in rpm it is very delayed in getting to 800rpm. The engine is the origional stock ’94, 454 in a 4WD Suburban. Any suggestions on where to start trouble shooting? Thanks, mike Never getting down to proper idle is likely a vacuum leak.

What to do if your Chevy 454 Idles low?

Check to see if the EGR valve is stuck open a little. If it is unable of running below 800 RPM test the fuel pressure, especially if the idle sounds weak and unstable. Is that 800 RPM, in park, or in drive?

What are the timing instructions on a Chevy 454?

Chevy 454 Timing Instructions. The numbers to the left of the V, looking at the engine from the front, are degrees of advance or how many degrees before top dead center. The numbers to the right of the V are degrees after top dead center. You always want to have the timing advanced or before top dead center.

Where is the compression stroke on a Chevy 454?

Look for the long straight line on the balancer and mark this. Look at the timing plate on the driver’s side of the timing chain cover. Notice that it has a V cut in the center of the marker plate — this is top dead center on the compression stroke.

How old is my Chevy Suburban HVAC actuator?

Chevy Mechanic: CCTMSTR, GM Certified Master Technician replied 11 years ago It sounds like a hvac actuator,Air inlet , temp or mode door actuator. increase and decrease the temp control, move the mode knob to different positions. Blower off.Is the sound inside or outside. open the hood to verify.Bare with me the vehicle is 16 years old.

Can a GM 454 back fire under load?

I have a 95 Bounder 28 with GM 454. I bought it used and discovered too late that it back fires under load during a hill climb. If I back off it stops but I also end up dropping down to 40-45 mph at times.

What causes a Chevy 350 to backfire when idle?

If a main vacuum hose such as the power brake booster feed line has broken or failing off it will cause a lean backfire due to the additional air allowed into the engine intake manifold. This problem will be accompanied by high or low engine idle and a harder to push brake pedal than normal.

What makes a GM 454 backfires a carb?

If a 4 barrel it might be the accelerator pump. I’mpretty sure Tim’s is a throttle body injection like mine. These look like a carb but are far from it. For that period it was GM’s answer to a carb and I think they worked better than a carb, but they came with their own problems.

Is the GM 454 a throttle body injection?

I’mpretty sure Tim’s is a throttle body injection like mine. These look like a carb but are far from it. For that period it was GM’s answer to a carb and I think they worked better than a carb, but they came with their own problems. I’m having problems with my engine which is a gen 5 454 tbi 220 model made in 1992.

If a main vacuum hose such as the power brake booster feed line has broken or failing off it will cause a lean backfire due to the additional air allowed into the engine intake manifold. This problem will be accompanied by high or low engine idle and a harder to push brake pedal than normal.

What causes an intake back fire in a car?

If the check engine or service engine soon light in on scan the computer for trouble codes. This will help locate the system that is having a problem and needs repair. An intake back-fire explosion can be caused by the fuel air mixture being to lean when the engine is demanding power.

Is there a problem with a 74 Chev Van?

I had starter problem on 74 chev van a few yearsback.Wouldn’t startafter towing trailer. It burned out and discount auto had a high temp rebuilt.It was just a starter that had armature and selinoid turned down. Never had another problem.

Are there any problems with the Chevy 454?

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.

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.

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Ruth Doyle