1988 Chevy Silverado idle problems

1988 CHEVROLET SILVERADO
87,500 MILES • V8 • 2WD • AUTOMATIC
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MARK IAGULLI
  • MEMBER
  • 2 POSTS
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
Nov 24, 2008 at 9:14 PM
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MASTERTECHTIM
  • ✓Experienced Mechanic
  • 4,750 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.
Nov 24, 2008 at 10:27 PM
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MARK IAGULLI
  • MEMBER
  • 2 POSTS
p.s.i replaced egr,plugs, wires,code 44 lean keeps coming up.and replaced o2 senser three times
Nov 25, 2008 at 1:13 AM
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MASTERTECHTIM
  • ✓Experienced Mechanic
  • 4,750 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.
Nov 25, 2008 at 9:49 PM
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