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Rough idle when fueling.

Tiny
SEASOLDIER
  • MEMBER
  • 2001 MITSUBISHI MIRAGE
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 76,000 MILES
When my car is running I take the fuel cap off and the car develops a rough idle and smooths out after a minute or so, I notice this when I fuel up and the car is running.
Friday, July 22nd, 2011 AT 11:43 PM

5 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
For safety reasons, the engine should be turned off when refueling. If problem does not occur during normal uses, then it is nothing to worry about.
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Saturday, July 23rd, 2011 AT 12:54 AM
Tiny
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Under normal driving I have an engine stumble only when the a/c is on, other than that it runs fine. Yes I know the car should be off when fueling, and it usually is but once when I had someone in the car it was real hot and I left it running for the passenger, that's when I noticed the stumble.
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Sunday, July 24th, 2011 AT 3:03 PM
Tiny
KHLOW2008
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Vehicle is equipped with emission controls and when fuel cap is off, the EVAP system would detect presence of fuel fuems which can cause it to react causing the erratic idling.

As to the engine stumble when A/C is turned on, if it occurs only at the time A/C compressor cuts in when turned on and/or when gas pedal is released after accelerating, the idle control system is not working efficiently.

Getting the throttle body and ISC cleaned should resolve the problem.
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Sunday, July 24th, 2011 AT 3:20 PM
Tiny
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Thanks so much for your reply, you guys are great.
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Sunday, July 24th, 2011 AT 3:31 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
You're welcome.

Have a nice day.
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Sunday, July 24th, 2011 AT 4:34 PM

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