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post #1 of 4 (permalink) Old 03-07-2007, 12:18 PM Thread Starter
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Car won't stay running

I have a 90 or 91 T-bird. It was given to me. It won't stay running. It has a 3.8 in it. The guy said the problem just started. Any ideas as to what I could check out?
It has spark, fuel, and compression. So could it be the MAF? or some other ensor. If you play with the throtle you can keep it running while in Park it idles fine. Just trying to move it the car wants to die.
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post #2 of 4 (permalink) Old 03-07-2007, 01:55 PM
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Try disconnecting the MAF sensor and see if that changes anything. If it does, the sensor is probably bad. The IAC could be bad, especially if you can keep the car running by giving it a little throttle. When you give it throttle and hold it at a spot, does the car run smooth? If so, it's more likely the IAC. Other things to check: vacuum leaks, fuel pressure, spark plugs & wires, fuel pump.

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post #3 of 4 (permalink) Old 03-07-2007, 06:07 PM Thread Starter
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It has recent plugs, wires. What and where is the IAC? What should the fuel pressure be at? I am kinda new to these cars. I am use to carbs. this is my first bad running noncarbed car. My 94 T-bird and 04 Mustang all run great. So this is just a toy to play with. Thanks for the help guys.
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post #4 of 4 (permalink) Old 03-07-2007, 08:24 PM
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The IAC is the idle air control valve. It's a device attached to the throttle body or intake on cars that regulates the amount of air entering the engine when the car is at idle. This is how the computer controls the idle speed of the car and also how the car is able to start without touching the throttle. On your car, the IAC is mounted in a crappy place. If you look down on the top of the intake manifold from the driver's side, you'll see it down there.

Fuel pressure should be around 32 psi at idle and 40 psi with no vacuum applied to the fuel pressure regulator.

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