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I have a 95 mustang v6 that I got as a project. It had blown was gasket and ran rough at idle with lack of power. I redid heads and gaskets etc it runs great and has good power but still idles rough at around 500 rpm, step on gas it smooths right out. I changed plugs wires and coil, and seafoamed it. It sometimes idles smooth but its short lived. When in traffic idling engine lite will blink then when moving it goes out and shows no codes. Any ideas?

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  • 946 Answers

Idling is too slow at 500 rpm.......think about at least 650 rpm to charge the battery and keep up inertia for better take-off power.
Find out how to increase rpm,whether it's a screw-stop adjustment or a timing problem. don-ohio (:^)

Posted on Jun 12, 2013

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Posted on Jan 02, 2017

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SOURCE: 95 GMC Jimmy 4.3l W vin rough idle

My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.

Posted on Dec 10, 2008

  • 1 Answer

SOURCE: 2003 Silverado rough idle, idles good after "check engine" light

Check your o2 sensor voltage, those trucks are real bad for o2 sensors, and yes if one sensor is reading 0mv, the others will start to drop out, and the vehicle will run very, rough. You also may check fuel system pressure, should be almost 60p.s.i. If its alot lower, Id be looking into a fuel pump. If that vehicle is drive-by-wire (no throttle cable), the throttle bodies get very dirty and cause that concern also. Id start by having the vehicle scantested.

Posted on Feb 07, 2009

  • 12 Answers

SOURCE: rough idle / engine surges until power is applied

Sounds like a possible vaccume hose leak?

Posted on Feb 07, 2009

  • 41 Answers

SOURCE: 2002 Subaru outback was idling rough and sometimes

Could be the Idle Control Valve?

Posted on Jul 06, 2009

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