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1991 Isuzu Trooper idle problem

Tiny
CSJETER
  • MEMBER
  • 1991 ISUZU TROOPER
  • 236,000 MILES
Won't maintain idle.
Replaced timing chain. In process replaced push rods lifters. Cylinder head machined prior to chain going. During troubkeshooting replaced all sensors and properly adjusted tps.
Replaced both fuel injectors. To no avail replaced computer. Problem continues to exist.
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Monday, October 21st, 2013 AT 7:14 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Have you checked for vacuum leaks? Have you checked the idle air control valve?
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Tuesday, October 22nd, 2013 AT 5:24 AM
Tiny
CSJETER
  • MEMBER
  • 2 POSTS
Yes. It appears to be a vaccum leak but am unable to locate. The following have been done:
After replacing timing chain had to replace push rods, lifters, cyclinder heads machined, replaced all sensors incl. TPS (which were properly adjusted), changed IAC, replaced computer, TBI, rebuilt fuel pressure regulator, repaced intake manifold gaskets, throttle body gaskets. Checked all vaccum hoses. Could not find leaks. The vechicle does not maintain idle after reaching operating temp. Idle drops. Struggles between 2-5rpms. Currently in the process of replacing coil.
Please advise as what else I may overlooked.
Btw: recently found the accelerator screw. It appears to be rusted and is currently a little hard to move.
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Tuesday, October 29th, 2013 AT 10:33 PM
Tiny
JACOBANDNICKOLAS
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I don't feel the coil is the problem. When checking for a vacuum leak, have you used something like carb cleaner?
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Wednesday, October 30th, 2013 AT 4:58 AM

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