Question about 1994 Mercury Grand Marquis

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1994 MGM engine stops running at long stoplights

I had replaced the MASS AIRFLOW SENSOR a couple of weeks ago because during cold starts I would have to wait a couple of minutes just to warm up the car before the car could move forward, it would basically **** back and forth and stall before pressing on the gas. Now, that doesn't happpen, after it was replaced no more hesitation, but now I don't hear the engine, no more rough idling, the engine is quiet as if It is about to die on me. While in drive and when at a long stoplight, or railroad crossing, my engine would just shut off, its as if it never reaches idle. I was thinking it can be the AIR BYBASS VALVE but there many names for that. I really think it soething to do with my idling. Anyone please help....I have had my car for four years and I never had a problem until now?!? //

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IAC Valve. I'm sure you've had this fixed by now.

Posted on Jan 04, 2010

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1 Answer

Starts cold then pull out it will die un til it gets good and at running temp done replaced pickup and tried coil it looses its voltage ti coil when this happens.


lots of mystery cold start problems that occur with electronic engine controls are attributed to two items , coolant temperature sensor (not the one that displays on dash) and the mass airflow sensor )these use a heated wire to measure airflow so if its dirty then it don't read the right airflow

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    • The engine drags or hesitates when idle or under load.
    • The engine hesitates and jerks during acceleration.
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Why won't my van start when it's cold outside & when I brake it acts like it's going to die on me. Also loud pops come out of muffler when trying to start. It starts fine when it warms up.


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