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2005 Mustang GT 4.6, 24 valve, loping idle.

Tiny
STEPHEN FISHER
  • MEMBER
  • 2005 FORD MUSTANG
  • 54,000 MILES
Replaced manifold, installed C&L performance manifold and 62mm L&M throttle body and ford racing cold air kit. Used bama custom tuning. Troubleshot, found no vacuum leaks. No manifold leaks. NO IAC valve on 4.6 liter, on cold starts high idle than after about 3-min's begins to lope between 700- 1500 rpm's. All this started after tuning and mod. It will stop when air conditioner is turned on. Or put in drive, (automatic-transmission.) Haven't replaced any sensors. Could this be a bad TPS, Thottle postion sensor? Or should I replace the MAF TO A AFTER MARKET SENSOR? I think I'll get my multimeter and do some testing. Any other advise. Also could the MAF be maxing out?
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Tuesday, October 18th, 2011 AT 12:03 AM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
With aftermarket parts, I don't have a manual to refer to. It could be the MAF.
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Tuesday, October 18th, 2011 AT 12:39 AM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
What about fishing net for ford/mustang performance/mod forum to seek others who may have had this problem?
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Tuesday, October 18th, 2011 AT 1:17 AM

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