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Thread: Cold stall

  1. #1

    Default Cold stall

    Hello I own a 1997 Mercury Grand Marquis with a 4.6 l engine I've noticed a cold stall on start up when I put it in reverse or drive. I put several parts in this car a mass airflow sensor cured the startup problem when it didn't want to start up initially then I put in a new IAC valve a new EGR valve new oxygen sensors upstream which was causing a computer light to come on that cured that and I tuned it up with some new spark plugs and wires they were very old and carbonized and a new battery too because the old one was starting to crank very slow but I still have this issue of cold stall when put in gear is this now fuel-related any ideas or opinions would be appreciated. thank you

  2. #2
    I post a lot... knucklehead0202's Avatar
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    Default

    First thing i would search for is vacuum leaks. With the car idling, spray starting fluid near various vacuum hoses/intake mating surfaces, etc. If you hear the idle change, you're close to the source of your leak. Also make sure your plugs are gapped correctly.

  3. #3
    I'm an air-conditioned gypsy gadget73's Avatar
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    The elbow at the PCV valve is a common leak point on these. It cracks.

    Ever used MAF cleaner to wash off the sensor? Sometimes they need cleaning. Does it generate any other codes?

    86 Lincoln Town Car (Galactica).
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    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

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  4. #4

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    MAF is new and no, no codes

  5. #5
    Beater gonna beat sly's Avatar
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    Yeah... if the PCV valve is original, that should probably be changed. Also, check the throttle body for excessive carbon buildup. If the air filter is dirty, that could be an issue as well.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM (SOLD), 93 Vic, 2000 Crown Vic, 2003 Expedition
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  6. #6

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    Are there 2 pcv valves? I see 1 on both valve covers. One a small one and one a bigger one.

  7. #7
    Beater gonna beat sly's Avatar
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    One is just an adapter for the hose.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM (SOLD), 93 Vic, 2000 Crown Vic, 2003 Expedition
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  8. #8
    Approaching 2 decades of DDing Box Panthers VicCrownVic's Avatar
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    For future searchers, it looks like a faulty new MAF was the issue: http://www.grandmarq.net/vb/showthre...talling-solved
    Vic

    ~ 1991 Mercury Grand Marquis LS "The Scab" - plenty of rot, summer DD
    ~ 1997 GMC Yukon - wannabe winter DD - returning summer 2020, I finally have an engine
    ~ 1991 Mercury Grand Marquis GS "The Ice Car" - My rotting winter DD
    ~ 1989 Mercury Grand Marquis GS - Rotting Retired DD
    Gone but not forgotten:
    ~ 1988 Country Squire ~ 1987 Ford Crown Vic


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