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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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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    What Are the Symptoms of a Faulty Mass Air Flow Sensor?
    • The engine stalls soon after starting.
    • The engine drags or hesitates when idle or under load.
    • The engine hesitates and jerks during acceleration.
    • The engine hiccups.
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Either your cold start system is not operating, or your Mass Air Flow Sensor is coated with varnish and needs to be cleaned with carb cleaner. Your engine coolant temp sensor tells your engine computer what the temo of the engine is. The computer then tells the fuel injectors how much fuel to inject. When engine is cold, it injects more fuel to keep the engine running. So, it may be the coolant temp sensor. Autozone can run a computer scan for free and tell you what the fault codes are. However, if the coolant sensor fails to always reading warm engine, the scan may not get a fault code for that.
A coolant sensor should be about $75, cheaper on ebay. Report back on codes and progress.

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