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1998 Chevy Cheyenne Fast idle

Tiny
JD438
  • MEMBER
  • 1998 CHEVROLET CHEYENNE
  • V8
  • 2WD
  • AUTOMATIC
  • 142,000 MILES
I have had some problems with my 98 chevy that started out with a rough idle. I took it in and they said it had a bad MAP sensor and post cat o2. I replaced both and still had the rough idle. I cleared the codes and ran again, got P0151, P0300, P0507, P1153. I checked the right bank plugs and they were fouled and I replaced. Replaced the right bank 02 and cleared the codes. It runs better, but now I still have the P0507 code for fast idle, 1200-1300 in park and about 1100 in gear rolling down the street. What is causing my fast idle?
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Saturday, February 28th, 2009 AT 4:33 PM

2 Replies

Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
Idle air control motor or blown intake gasket
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Saturday, February 28th, 2009 AT 7:47 PM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
If one bank of plugs got fouled that is sometimes a sign of a leaking fuel pressure regulator. Its the passengers side that fould out. Also check for a restricted converter if you have loss of power too.
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Saturday, February 28th, 2009 AT 7:53 PM

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