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1988 Chevy Silverado idle problems

Tiny
MARK IAGULLI
  • MEMBER
  • 1988 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 87,500 MILES
Truck idles high low high low.I have changed tbi gasket, tps, map senser, idle air control, coil, distributor, checked for vac leaks, new exuast, and fuel filter. Checked timing ok
Tuesday, November 25th, 2008 AT 5:14 AM

3 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Unplug the vacuum line to the egr valve and plug it and tap on top of valve to make sure its fully seated and drive it, if surge goes away then problem is with valve or solenoid.
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Tuesday, November 25th, 2008 AT 6:27 AM
Tiny
MARK IAGULLI
  • MEMBER
  • 2 POSTS
P.S.I replaced egr, plugs, wires, code 44 lean keeps coming up. And replaced o2 senser three times
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Tuesday, November 25th, 2008 AT 9:13 AM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Unplug egr and plug it. If the egr solenoid is applyinf vacuum to it then it will be partially open causing it to run lean. You will need to check fuel pressure too. The specs are 9 to 13 psi but I found that if it doesnt have atleast 11 psi then it will run poorly.
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Wednesday, November 26th, 2008 AT 5:49 AM

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