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1993 rough (& slow?) idle

DanC

Well-known member
Joined
Jun 12, 2002
Messages
74
Location
Bradford, MA USA
Corvette
1993 Ruby Red Coupe
My 1993 automatic hot idle speed is about 500-600 rpms and is a little rough. Smooths right out above that speed and runs well throughout the speed range.

It also smooths out with the A/C on as the idle kicks up to about 900 rpm.

Do I have a problem or is this normal? This has been my 1st summer with the car and it has been consistent since the spring when it came out of winter storage.

Car has about 48K on it and is in very good shape. I've had nothing apart. I did run a 1/2 a can of Sea Foam through the intake via one of the manifold vacuum fittings and the rest of the can in 1/2 tank of fuel, but it made no noticable difference (except for the smoke during the treatment :) ).

Advice?
 
Rough Idle

I have almost the same problem with my 1985 Vette, the question I have, is there any sudden surge or idle problem around the 1000 RPM when automatic shifting or is just when you are sitting there idleing. They tell us to check, fuel pump pressure, wiring, plugs, and related ignition, egr valve, also use tetron addative to the gas, good luck and please let us know if you find the answer. Doc
 

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