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Old 07-12-2010, 07:01 PM
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1991 5.0 mustang.

for the past few months my car has started blowing white smoke when i take off from a light, but it is only after the car sits and idles at the stop lights..so i went and changes plugs and wires figuring that would help, it probably needs a valve job. Now i have a whole new problem..... when i start the car it wont even idle it goes to about 1-2k rpm and then just dies... If i keep pressing the gas so that it will keep feeding the engine gas i can manage to keep it running, but it runs terrible. i cant even drive the car because it wont idle and stay started... any ideas on where to start?

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Old 07-12-2010, 07:14 PM
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Check it for vacuum leaks. Is the check engine light on? if so check the codes.
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Old 07-12-2010, 08:18 PM
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if it just got worse after you changed the plugs and wires I would go back and double check everything.
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Old 07-12-2010, 09:08 PM
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ok,, i drove it after changing the plugs and it was fine so i dont thats is.... and the engine light is not on.
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Old 07-12-2010, 09:36 PM
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does that have the mass air flow senser?
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Old 07-13-2010, 02:50 AM
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is it still blowing white smoke?

If it is, then you got a bad head gasket.
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Old 07-13-2010, 10:57 AM
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i dont know if its blowing white smoke i cant get to idle long enough to look. and i believe it has a mass flow sensor.
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Old 07-13-2010, 11:03 AM
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You`ve checked it for vacuum leaks? Some times the vacuum line splits on the bottom side where you can`t see it and you have to feel around them to find it.
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Old 07-13-2010, 11:25 AM
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I had a similar problem with a 5liter that sounds exactly the same. Disconnect the mass sensor and see if that helps, the check engine light will come on but the problem will lighten up. if it lightens up at all then replace the sensor. if nothing changes or it get worse obviously its not that.

did you check to make sure there were no vacuum leaks? as asked above^^^^
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Old 07-13-2010, 02:18 PM
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thanks guys it was the mass air sensor!!!
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