1998 GMC Jimmy once in while shuts off when shifted in park

Tiny
ROYCAR71
  • MEMBER
  • 1998 GMC JIMMY
  • 125,708 MILES
I recently had po452, po171, po174. I had fuel pressure sensor and elbow on top of intake manifold pleumn from pcv valve replaced. I took off Mass Air flow Sensor and cleaned with CRC MAF spray. No CEL shows now. But on occasion I get little hesitation when I step gas and truck shuts off when I shift gear into park. It will start up and drive ok other than earlier mentioned hesitation.
Sunday, September 15th, 2013 AT 6:48 PM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
171,174 can be caused by vacuum leaks, pcv valve, mass air flow failure or low fuel pressure. Mass air flow cleaners have little or no effect. Assuming you cleared the codes, they will return after failing 3 drive cycles if there is still an issue. You need to monitor the long term fuel trims to diag the failure.

As far as idling, it could be a vacuum leak, throttle body or idle air control.

Roy
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Saturday, September 21st, 2013 AT 2:11 AM
Tiny
ROYCAR71
  • MEMBER
  • 363 POSTS
Currently, codes have not returned. I still get the occasionally abrupt shut off when shifting to park.
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Friday, September 27th, 2013 AT 1:49 AM

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