1993 Chevy Truck low idle

Tiny
PHILSUSOEV
  • MEMBER
  • 1993 CHEVROLET TRUCK
  • V8
  • 2WD
  • AUTOMATIC
  • 286,000 MILES
My truck has had a low idle, also upon light acceleration, and around 1200-1800 RPM, it has some hesitation. It runs fine other than that. I changed the idle air sensor at the throttle body, now it seems worse. Had trouble starting the truck this morning. What else could it be and why would it get worse after changing the IAC? Thanks.
Thursday, July 2nd, 2009 AT 10:07 AM

5 Replies

Tiny
DR LOOT
  • MECHANIC
  • 2,311 POSTS
The first thing I would've done is change the fuel filter and checked the fuel pressure that is what it's starting to sound like.
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Friday, July 10th, 2009 AT 10:23 PM
Tiny
PHILSUSOEV
  • MEMBER
  • 3 POSTS
I changed the fuel filter, I have since changed the MAP sensor, O2 sensor, plugs, wires, cap, rotor, EGR valve solenoid, coil, IAC, TPS. I took it in to a shop, they said it's my distributor that is making the timing jump around. So I guess I'll change that next?
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Friday, July 10th, 2009 AT 10:34 PM
Tiny
DR LOOT
  • MECHANIC
  • 2,311 POSTS
That could be true, and it may be a possibility, but you haven't mentioned you check the fuel pressure?
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Friday, July 10th, 2009 AT 10:58 PM
Tiny
PHILSUSOEV
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  • 3 POSTS
Changed the EGR valve, runs like a champ now.
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Wednesday, July 15th, 2009 AT 5:10 PM
Tiny
DR LOOT
  • MECHANIC
  • 2,311 POSTS
A dirty EGR Valve will cause a e radical idle, but I just assumed by your statement "I have since changed. EGR valve solenoid" I assumed that you had already looked at that, at any rate, I'm glad you solve the problem and thanks for the info I will pass it on.
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Wednesday, July 15th, 2009 AT 5:21 PM

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