High Idle when cold, revs between shifting

Tiny
SIDNEYBRENT
  • MEMBER
  • 1989 CHEVROLET TRUCK
  • 6 CYL
  • 2WD
  • MANUAL
  • 245,000 MILES
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.
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Sunday, June 19th, 2011 AT 7:19 AM

5 Replies

Tiny
RASMATAZ
  • MEMBER
Clean out the throttle bore/plate and look for vacuum leaks before engine gets to operating temperature-also check fuel pressure-let me know
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Sunday, June 19th, 2011 AT 9:14 AM
Tiny
SIDNEYBRENT
  • MEMBER
What is the throttle bore / plate. Is it where the throttle body meets with the intake manifold?
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Monday, June 20th, 2011 AT 7:26 AM
Tiny
RASMATAZ
  • MEMBER
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
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Monday, June 20th, 2011 AT 7:40 AM
Tiny
SIDNEYBRENT
  • MEMBER
This is a TBI the air cleaner is on top. I cleaned out using carb cleaner spray and inline fuel injector additive.
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Monday, June 20th, 2011 AT 6:38 PM
Tiny
RASMATAZ
  • MEMBER
Recheck the IACV, TPS and look for vacuum leaks-also rev's between shifts could mean the clutch slipping
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Monday, June 20th, 2011 AT 7:02 PM

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