ROUGH IDLE COUPLED WITH ACCELERATION ISSUES

  • Tiny
  • MustangLove
  • 1998 Ford Mustang
  • 60,000 miles

I've had some issues with this car. Back in May I had the intake manifold gasket, the waterpump, and the thermostat replaced after the coolant in my radiator corroded just about everything. I got that taken care of then noticed my car was still idling wierdly (when I started the car while it was still warm it would rev then decrease to almost stalling out). The wierd idling is a little more mellow these days, but I've started seeing a new symptom as of very recently: I can take my foot off the gas and my car will still slowly, but surely accelerate of its own accord. I have to ride my break and when its like that, it revs at around 1500rpms. This is terrifying! I was told replacing the fuel pump would help that and that the O2 sensor would fix the idling, I'm about to go get those done, but I have a gut feeling there is more to this. Can someone please tell me if the o2 and fuel filter would save my baby or is there more work that I should have done?

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Monday, July 16th, 2012 AT 5:56 PM

5 Replies

  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

Suspect problem with Idle Speed Controler chekc engoine light on? Any codes?

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Monday, July 16th, 2012 AT 6:00 PM
  • Tiny
  • MustangLove
  • Member

Yeah, when I took it to the shop, they ran a diagonistics scan and found that the o2 sensor, bank 1 sensor 1 was running lean.

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Wednesday, July 18th, 2012 AT 12:36 PM
  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

Usually that is an exhaust leak in front of 02's

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Thursday, July 19th, 2012 AT 7:42 PM
  • Tiny
  • MustangLove
  • Member

I've had this gut feeling that it was some kind of air/exhaust leak, but I'm no professional and didn't no for sure. What would be the best way to determine if that really is whats going on?

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Friday, July 20th, 2012 AT 12:57 PM
  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

Dis connect ISC what effect on idle? Inspect exhaust for leak maybe audible

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Friday, July 20th, 2012 AT 3:18 PM

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