1997 Jimmy

Tiny
DEWEY62
  • MEMBER
  • 1997 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 162,000 MILES
1997 jimmy 4.3, got p0102 code (maf sensor), I replaced with new maf and erased code and truck still runs rough, I disconnected maf and code comes back but the truck runs fine, I repeated that procedure a few times with same results, sure could use some help here, by the way I just replaced intake manifold gaskets upper/lower, replaced wires, plugs, map sensor, frustrated in minn, mn. Thanks much
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Monday, March 7th, 2011 AT 9:53 AM

5 Replies

Tiny
WRENCHTECH
  • EXPERT
Did you have this problem before replacing those parts?
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Monday, March 7th, 2011 AT 12:57 PM
Tiny
DEWEY62
  • MEMBER
First off, thank you for replying wrenchtech, sorry for not revealing that pertinent info, no is the answer, it was running fine, just leaking from manifold front seal, so my nephew and I who are both pretty mechanically inclined dug in and tried to save my girlfriend some money and have become bewildered with why its not running correctly now, I did read a thread today that when changing a maf sensor you should disconnect your battery for 10 min and reattatch so that the ecm can relearn (reset its self), also I contemplated maybe fuel pressure is low? Please respond with any ideas, thank you, ps if I had a credit card or bank card I would have been happy to donate something or if I were standing before you I would be happy to compensate you for your time and or trouble, I am appreciative for your input to this frustrating problem, (going on 2+weeks), thanks again
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Wednesday, March 9th, 2011 AT 9:53 AM
Tiny
WRENCHTECH
  • EXPERT
Well, I hate to say it but you didn't have the problem before you worked on it so it's likely something you did in the process. Go back over your work and look for damaged or pinched wires. Check the intake snorkel and all attaching hoses and make sure there are no air leaks between the MAF and the throttle body.
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Wednesday, March 9th, 2011 AT 12:44 PM
Tiny
DEWEY62
  • MEMBER
Wrenchtech, well im glad you did say, we went through the applicable wiring, vacuum lines, even tried the ecm relearn process, assessed it couldnt have been the fuel pressure because it ran fine when the maf was disconnected, so we figured it had to be in the vacuum system somewhere but couldnt find exactly where, so we brought it to a friends mechanic and he put his vacuum reader on it and found nothing, he then put his electronic analyzer on it and found there was a vacuum leak somewhere, he grabbed a spray bottle of good old h2o and sprayed it around the purge solenoid valve and sure enough it sucked the water up right away, in the reassembly process we wrongly seated the purge valve, it took ten minutes to rectify a 2+week mystery(headache), old lesson relearned, always put it back the way you found it, by the way my nephew and I thinks its awesome that guys like you and others like you take time out of your day to help your fellow man in time of need, god willing keep up the good work, once again thank you and god bless.
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Thursday, March 10th, 2011 AT 11:52 AM
Tiny
WRENCHTECH
  • EXPERT
Glad to hear you found your problem.
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Thursday, March 10th, 2011 AT 12:13 PM

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