HIGH IDLE WHEN COLD, REVS BETWEEN SHIFTING

1989 Chevrolet Truck

Tiny

sidneybrent

June, 19, 2011 AT 7:19 AM

1989 Chev 1500 4.3L V6 Std 2wd, Very High Idle on cold starts, rev's between shifting, calms down when warm, rough idle. Replaced Coolant sensor, TPS, EGR solinoid, IAC, PCV Valve, thermostat, Rotor/cap, plugs.

5 Answers

Tiny

rasmataz

June, 19, 2011 AT 9:14 AM

Clean out the throttle bore/plate and look for vacuum leaks before engine gets to operating temperature-also check fuel pressure-let me know

Tiny

sidneybrent

June, 20, 2011 AT 7:26 AM

What is the throttle bore / plate. Is it where the throttle body meets with the intake manifold?

Tiny

rasmataz

June, 20, 2011 AT 7:40 AM

Is this a TBI or CPI fuel injection? -On a CPI Is where the air intake tube from the aircleaner meets the throttle body-behind it you will see a butterfly. On a TBI its right under the air-cleaner

Tiny

sidneybrent

June, 20, 2011 AT 6:38 PM

This is a TBI the air cleaner is on top. I cleaned out using carb cleaner spray and inline fuel injector additive.

Tiny

rasmataz

June, 20, 2011 AT 7:02 PM

Recheck the IACV, TPS and look for vacuum leaks-also rev's between shifts could mean the clutch slipping

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