Mustang dies at highway speeds
11-04-2007, 08:15 PM
#1
3rd Gear Member
Thread Starter
Join Date: Oct 2006
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Posts: 774
Mustang dies at highway speeds
This is really getting on my nerves because of how dangerous it is. Basically, my car will try to kill itself when I push the clutch in and roll to a stop in neutral. I have seen sooo many people complaining about this and all everyone says is "its the IAC" well I replaced that and it is still doing it
This CANNOT be good for the engine. When I am coming to a stop the revs will drop and hold at 1k like normal, then down to 700< ok little low but still ok then it will nose dive to 500 and all the way down to 100
at this point the power steering basically shuts off and half the time the engine stalls. If I do come to a stop without it dying the revs will bounce between 100-500 continuesly for about 10 seconds and then eventually find its way back up to 750. What could this be!!!! fuel filter, spark plug wires, mafs???? it is complete
and if my car keeps on doing I might be forced to sell it
This CANNOT be good for the engine. When I am coming to a stop the revs will drop and hold at 1k like normal, then down to 700< ok little low but still ok then it will nose dive to 500 and all the way down to 100 at this point the power steering basically shuts off and half the time the engine stalls. If I do come to a stop without it dying the revs will bounce between 100-500 continuesly for about 10 seconds and then eventually find its way back up to 750. What could this be!!!! fuel filter, spark plug wires, mafs???? it is complete and if my car keeps on doing I might be forced to sell it
11-05-2007, 08:45 AM
#4
Super Moderator
Join Date: Jul 2003
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Posts: 14,917
RE: Mustang dies at highway speeds
I had the same problem as you in my 02 GT. I used MIL Eliminators on my O/R H-pipe.
The idle would jump anywhere from 100-500 rpms, jump to 800 and then spike to 1500 and drop all over again. When the Eliminators finally failed - my idle returned to normal, my car stopped stalling out and everything was fine again. I drove it for 10,000 miles after with new MIL's and never had any driveability issues again.
Why it happens, I couldn't tell ya. But that was the source of my problem.
The idle would jump anywhere from 100-500 rpms, jump to 800 and then spike to 1500 and drop all over again. When the Eliminators finally failed - my idle returned to normal, my car stopped stalling out and everything was fine again. I drove it for 10,000 miles after with new MIL's and never had any driveability issues again.
Why it happens, I couldn't tell ya. But that was the source of my problem.
11-05-2007, 08:55 AM
#5
4th Gear Member
Join Date: Jun 2005
Location: northern MI/southern LA
Posts: 1,362
RE: Mustang dies at highway speeds
same problem here, but with mine the a/c compressor would constantly be turning on and off. maybe low on freon so it would have to pressurize itself -- occationally when putting the clutch in and the a/c compressor would kick in at the same time, at that point it would draw too many rpm's. the result, the engine did exactly what your talking about. we disconnected the a/c and now the car idles as it should, not a problem since. so try it out, disconnect the a/c take it for a ride and see if that helps. only a 2 minute job.
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