Question about 1985 Chevrolet Corvette

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Poor acceleration almost sounds like a missfire, gets a little better after engine temp over 75c. After long run it will show code 32 (egr) But the EGR works fine.... Vacuum?

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EGR valve could be sticking. Try removing it and cleaning it out with carb clean. Carbon buildup can cause this problem.

Posted on Jun 21, 2009


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Have you checked for vacuum leaks? Poor idling when cold that gets better when the engine warms up, or at higher RPMs are symptoms of vacuum leaks. Check all hoses and connectors. If it's a manifold gasket, you will want to use a smoke machine (check when the engine is cold).

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Combining the hot cat converter and the missfire code, I would lean toward a fuel problem. Too lean or pressure too low.
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Has to be a fuel problem somewhere along the line ,poor mileage is the result of too much fuel being burnt and what ever is causing this is the problem ,now as this vehicle is a 5.7 litre with a massive CO2 footprint then i would respectfully suggest that you trade this vehicle in for scrapage and buy a nice new kia seed or better still a niceford fiesta diesel or a VW polo diesel ,all these cars will do 70+ mpg which is a far better alternative than a gas guzzler yank tank .Any way this one --try hooking up a code reader if it has a OBDII and reading the PIDS with engine running as this will show the air flow and timing advance as this should give a clue as to whats wrong ,also use a timing light with a magnetic sensor and check each lead in turn in case you have a failed coil pack and the induction sensed timing light will show if a cylinder is missing or fluctuating under load .

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could be a cold start issue. there is a water temp sensor near the thermostat. when you start your engine first for the day it will show the engine to be cold and therefore the computer will do a 'cold start', meaning using more fuel. but this should throw a computer code. if you are not getting any codes from the computer then check for a vacuum leak. like the EGR vacuum line for starters. the egr should be closed when the engine is cold and open as the engine warms up.

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