1990 Corvette idling rough?
I own a 1990 Corvette that has had a fresh tune-up within the past six months, which included new spark plugs, wires, filters, and a distributor. However, when I start the engine, it idles roughly to the point of almost shaking. I took it around the block and noticed it ran better at higher speeds, but the rough idling returned when I slowed down. I don't believe the issue is related to the spark or fuel systems. Could it potentially be an issue with the air intake or something else? I would appreciate any thoughts or insights into what might be causing this problem.
4 Answers
The very first step before spending a penny on a rough idle condition is to do a compression test. If the compression is even then you know you have a tune related problem. Without knowing the condition of the engine you could be throwing money at this for days before finally figuring out you have a burnt valve or bad rings in one hole.
That said, at this point it’s not hard to pull the EGR valve off and block it off to see if that’s leaking and to also disconnect one injector at a time while looking for a no change condition. If you find a low hole you could try swapping injectors to see if the misfire moves with the injector but at the very least do a compression check on that hole before you go to all the trouble.
check the computer for error codes. Google search old GM computer testing.
Air wouldn’t cause a rough idle. What you have sounds like a misfire and even with new plugs and wires, if a piston is damaged and oil is getting past the ringlands that would wet the spark plug and that cylinder would not fire. Have you pulled all the spark plugs to make sure they are dry?
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