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I have a 1985 4.3 (Z) with no fault codes. Stalls when placing it in drive

Tiny
DAVE FISHER
  • MEMBER
  • 1985 CHEVROLET MONTE CARLO
  • 130 MILES
The engine stalls under load (Placing it in Drive). Transmission is a 700-R4 and has a pressure switch for the converter lock out bypassed. Replaced EGR, TPS, EAC and Intake Gasket.

Ground from sensor to PCM? If so need to find the ground pin outs
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Wednesday, December 7th, 2011 AT 4:36 PM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
First eliminate all vacuum or air leaks in the system. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
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Wednesday, December 7th, 2011 AT 5:14 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Disconnect the TCC solenoid and see what happens
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Wednesday, December 7th, 2011 AT 5:19 PM
Tiny
DAVE FISHER
  • MEMBER
  • 2 POSTS
Replaced IAC and Injectors and cleaned throttle plate and body. Fuel pressure is very good. Vacuum holds steady in park.
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Wednesday, December 7th, 2011 AT 5:26 PM

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