Quote:
Originally Posted by Terry Waldron
Have a 92 chevy truck 454 TBI, idles so high I can drive it 15 to 18 mph without touching the gas. I have checked lines for vacuum leaks, replaced TBI gasket, IAC valve, PCV valve, EGR valve, Coolant Temp sensor. Any ideas. would help.
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No codes? If you already changed the IAC, then the computer must be sending it false voltage signals. Possibly not reading RPM correctly? Did you clean out the hole where the IAC plunger rides?
If all else fails, you could bug Ed Wright about it.Don't tell him I sent you.