Car shuts off when i come to a stop - Ford Mustang Forum
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post #1 of 18 (permalink) Old 04-04-2004 Thread Starter
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Car shuts off when i come to a stop

this just started a few days ago, but when i start up my car I've got to gas the hell out of it or it shuts off. It has this really rough idle. Once it wamrs up and i drive around town, it will still shut off at when i come to a stop. It won't always shut off but it has that rough idl and tries to. I have to put the car in park and gas it. Once i get going the car is fine, but to get going the car bucks a little bit.

I should also note that i replaced my alternator about 4 months ago. After i did, when the car was running, for some reason the battery light would always stay on, and i can't get it to shut off.

*Steve Schmid*

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post #2 of 18 (permalink) Old 04-04-2004
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Sounds like a really bad vacuum leak . Hook up a fuel pressure gauge and vacuum gauge if you got it to see what exactly is going on.

Try tightening your ground cables also .

Take off your idle air control valve and try cleaning it with rubbing alcohol.

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post #3 of 18 (permalink) Old 04-04-2004 Thread Starter
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checked the ground wires and they're all tight.

There is a black box on the passenger side right below the radiator. It has two hoses that connect to the top of it. One was disconnected entirely! I reconnected that hose and my car hasn't shut off at idle yet. Though the car still has a very rough idle. I checked the motor mounts and they're fine

*Steve Schmid*

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post #4 of 18 (permalink) Old 04-04-2004 Thread Starter
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I'm not sure where the idle air control valve is.

*Steve Schmid*

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post #5 of 18 (permalink) Old 04-04-2004
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Dont know if the vapor cannister would have anything to do with it (you said it was disconnected completely on one side)..

But the idle air control valve is a little cylinder shaped object sticking out of either the throttle body, or the EGR spacer. Held on by only a couple screws if i remember correctly.
I had to clean this once way back when my idle was all screwed up... turned out to be a Throttle Position Sensor problem.
Have you tested that yet??

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post #6 of 18 (permalink) Old 04-04-2004 Thread Starter
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i cleaned what i think is the idle air control valve, the black object on top of the TB with two screwws holding it in. Inside was a small metal sensor looking object and i cleaned all the dust off it. I'm gonna take the car for a spin in a little bit.

*Steve Schmid*

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post #7 of 18 (permalink) Old 04-04-2004
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That was your throttle position sensor. In order to properly put it back on, you need to use a voltmeter. It has to be set at .98v

The IAC is held on by two 8mm bolts and it goes on the front SIDE of your throttle body. It has a little harness that plugs into it.

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post #8 of 18 (permalink) Old 04-04-2004 Thread Starter
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when i took off the throttle position sensor i didn't unplug the wires going into it. I just removed the top and cleaned out the inside.

*Steve Schmid*

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post #9 of 18 (permalink) Old 04-04-2004
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Still needs set And I second the throttle position sensor being bad , either that or a complete tune up . plugs wires cap rotor air filter and a fuel filter Also the battery light has me wondering . I would chech the battery while it's running with a volt meter and see what it reads

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post #10 of 18 (permalink) Old 04-04-2004 Thread Starter
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i picked up a digital multimeter today and have no idea how to use the damned thing

*Steve Schmid*

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Quote:
Originally posted by Fordgazm
Still needs set And I second the throttle position sensor being bad , either that or a complete tune up . plugs wires cap rotor air filter and a fuel filter Also the battery light has me wondering . I would chech the battery while it's running with a volt meter and see what it reads
I'm with Jason on this one...

Did this problem happen all of the sudden or did it progressively start getting worse? Have you done anything to the car recently? Changed anything at all?
post #12 of 18 (permalink) Old 04-04-2004 Thread Starter
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i noticed it 3 or 4 days ago. Last weekend i installed a new exhaust manifold gasket on the drivers side. I've been battling an exhaust leak for months, and thinking it was the manifold gasket i changed it three diff times. I've spent hours adjusting all different parts of the x-pipe and can't find the damned thing.

Aside from the exhaust leak when i get up and am excelerating it is fine, but when i let off the gas and just coast, the car bucks.

*Steve Schmid*

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Did you remove anything when you replaced the gasket that you maybe forgot to reconnect? I've done that before. An exhaust leak can cause a car to run funny on a fuel injected car if the exhaust leak is bad enough. What kinda gaskets are you using with what headers? Are your ports on your headers oval or rectangular? I can recommend a gasket that won't blow out very easy. Is it leaking from the flange where the pipe meets the header or where the hedder meets the manifold? Double check. Also check to see if one of your headers is cracked. That also happens. Headers mostly crack at the welds. What brand of headers are they?

I know lots of questions... Just trying to help you out.
post #14 of 18 (permalink) Old 04-04-2004 Thread Starter
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they are BBK shorty headers.

All i removed was the spark plugs on the drivers side and i checked again to make sure the firing order was correct. I tried a few diff felpro gaskets, and the most recent ones i bought were extra extra thick. The leak doesn't seem to be coming from where the header connects to the exhaust manifold. But i also got underneath the car and readjusted and tigthend the flange where the header meets the X-Pipe.

*Steve Schmid*

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Whats the timing set at ?

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