Join Date: Aug 2007
Location: Northern Wackyfornia
My Ride: 86 & 87 GLHS
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Strange new driving sensation (86 GLHS)
I have a GLHS with a stock configuration engine, stock turbo, 3" wastegate, 2.5" exhaust, and stock A-525. After the engine is warm, the RPM's at idle had been sitting at 1100 and was running flawless. Without touching anything under the hood, the RPM's suddenly dropped last week to at a fairly consistent 800 at idle. If I am driving a constant speed in the city, the car starts bucking a little like the engine doesn't want to hold a constant RPM (If I am parked in neutral and bring the engine over 2000 RPM's, I see tach needle fluctuating up and down by several hundred) . I get the same sensation if I am descending a hill in 2nd gear for braking or if I am moving slowly with RPM's low in any gear. Acceleration, boost, and shifting through the gears seem to be normal. The engine does not seem to have any extra vibrations out of the ordinary.
Does anybody have an idea where I should begin looking to solve this problem? Thanks in advance for your help.