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- '99 Mercury Grand Marquis Rough Idle/Stalls
September 11, 2005, 4:07 pm
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I have a '99 Grand Marquis recently it started have problems at idle.
Sometimes it idles but it feels like it is idling below its normal idle
speed. When driving it doesn't have a problem at any speed, however,
occasionally when cornering it will die. The check engine light has not
come on (other than the normal times when starting or restarting). I had
the codes checked anyway and as I expected I set a code of P1507 because I
have been keeping my foot on the accelerator to keep it from dieing at
idle. Any suggestions would be greatly appreciated.
Re: '99 Mercury Grand Marquis Rough Idle/Stalls
On Sun, 11 Sep 2005 12:07:17 -0400, "lmcsween"
IT sounds like tha IAC is dirty. Many times they can be
cleaned and reinstalled after soaking in throttle body
cleaner for a while followed by a good spray dousing. While
you are at it, it would be a good idea to clean the MAF
sensor and the EGR ports in the manifold. The IAC will not
normally set a fault code just because it is dirty. It can
also cause hard cold starts and no high idle when cold as it
- George Csahanin
September 11, 2005, 10:35 pm