VCCA Home Forums TECHNICAL - GENERAL Mechanical - Engine, Trans, etc can anyone help?

I have a commaro z28,305 v8, and no matter what I seam to do so far I can't seam to get the RPM's to go past 2500 or 3000 at the most. I have changed the plugs, plug wires,Ignition coil,Distributer cap, and tried adjusting the timing nothing seams to work, no Iam about to reinstall the vacume lines. If anyone could help it would be great? Thanks

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Possible fuel filter or fuel pump.

Gene is probably correct, but what I do not understand is the comment about reinstalling the vacumn lines, are you trying to rev the engine with the vacum lines unhooked?

Glyn, no I was told that maybe if some of my vacume lines were leaking it might have a similar effect, I wasn't sure so I decided to replace them any ways.

I just found that my car has two fule pumps an electrical and mechanical does anyone have any info? I don't know to much about cars accept how to change the fluids,and the grease zurks.

could a plugged exzost cause this problem?

Iam just about to replace the fule filter,and test the fule pumps, I will let you know if that works.

I had that happen on car it was a plugged up catalytic converter.

I had the same thing happen several times on the same vehicle in the past, and each time it turned out to be a plugged fuel filter.

my experiances with a plugged fuel filterer and also on another car that had a plugged tank screen was it would run ok for a few miles then quit, after a while it would start and run for a few more miles. The plugged catalytic converter caused the car to gradually lose power but ran steady. finally it got to where the car would not run any faster than 60 mph floorboarded.

Absolutely! A plugged catalytic converter will definitely have those symptoms (microdragon didn't mention if he has one on his car) but both times I experienced a dirty fuel filter I had the same symptoms as a plugged catalytic converter.

Right, And without knowing if the Camero even had a catalytic converter. Also no mention about whether it is a TBI, a TPI or carburated either. With the later engines I always noticed a slight miss at an idle when the filter needed to be changed. What do you think about the new filters on the GM trucks that never need to be changed? they are in the fuel tank.

My son had a car that would only go about 35 mph at full throttle. He found that the exhaust manifold would get red from driving it very far that way (trying to get where he was going). The engine was getting lots of fuel but burning it in the manifold. Yes, the cat converter guts had almost completely solifified. Putting in a "test pipe" transformed the car.

After you drive it a ways at full throttle, pop the hood and see if the engine is really hot. This could be a clue that it is a plugged catalytic converter. If the engine is at normal temp it is probably a fuel supply problem.

At one point in time Chevrolet used a laminated exhaust take down pipe which had a history of the inner laminate collapsing, restricting the exhaust flow, with a suimular result as described above. It was necessary to remove the pipe and drop a round object (golf ball) through it to determine if the inner laminate had in fact collasped. No visible signs by just looking at the unit.

This was in the 1965-67 years.Was common .Happened when the car was driven thru deep water and the exhaust pipe was hot.The info given here is rather scant but being a 305 would bring it up into th late '70's. +