Need help with 97 GT stalling problem

97woodward

New Member
Feb 25, 2008
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Ann Arbor, MI
Hey everyone , I just recently joined here but was a member over at allfordmustangs forum for years. I have a tech problem that has boggled me and many mechanics who have tried to solve it. Any help would be appreciated.

Ok, I'll start by telling you briefly about the car, its a 97 GT automatic with 87k on it. The car as a few modifications done but nothing major (no blower or anything). The problem Im having has occured since I first bought the car two years ago.

The problem is the car stalling out randomly. It will, or only has stalled out when im at a stop with my foot on the brake. It dies normally so quickly that i dont even have time to check to see if the rpms are dropping. I have replaced my IAC valve also. It has occurred probably around 5 times in two years.

The car will stall out, I will try to start it and it seems like it almost catches but not quite for around 15 min. The time it takes for it to get started has increased each time it has stalled. Also, when I am trying to start it about after 2 min of trying it starts to give off a very strange smell I cant identify. It doesnt shoot a trouble code or anything and typically after i do get it started again it will show NO signs of stalling again until about 3 months later when it randomly happens again.

I have recently done a full tune-up and got my transmission serviced to try and solve the problem but sure enough one of the random stall outs happened about 3 weeks after the tune up. I have taken it to the Ford dealership and they pretty much tell me the same as everywhere- If it doesnt happen while they drive it they cant diagnose it. And it will cost a ton for them to just go through possibilites, so I am trying to get your opinion of what some of the best places to start are.

The car has given me some trouble starting before in the past which was caused by my theft system activating (i believe). The theft light would flash and it took around 3-4 min for it to start, it did that about twice and hasnt happened in a long time. I dont think this would cause it to stall out though. The car normally starts perfectly though.

The only other thing I would like to mention to you about the situation is something new that happened after this most recent stall out. The car made a strange clunking noise which seemed to occur under the hood right as it started up after the 15-20 min of trying. After it did that it is continueing to make that strange clunking noise nearly every time it starts. The split second before the car will fire up I here this strange clunk that is somewhat hard to describe. Any help on this is very appreciated. Its making driving not nearly as much fun. Its in the shop now getting some suspension work and gears installed as well as a tune, Im hoping he'll find something but if you have some ideas I would like to run it by him. Thanks alot and sorry soo long!
 
I know it sounds simple but have you replaced the fuel filter lately?

Just sounds fuel related to me...also if you have a weak battery the injectors will drop off and cause it to shut down so check the alternator and battery to make sure you are good there.
 
Replaced Fuel filter and Idle Air Controller. Ive done all the inexpensive routes I could. Now im at the part where i need to make some expensive decisions or live with it.

I was told it may be the ignition control module or crank sensor. The clunking noise indicated to some people that it may be my starter, but Ive never really had many problems starting the car.
Any other ideas appreciated!
 
Bad starter wouldn't make your car die once it was started. When was the last time you changed plugs and wires? It really sounds like a coil pack to me to be honest. If there is anyway to test them I would do that first.
 
The infamous stall. This stall only pretains to 96-97 4r70w (Auto) GT's. Obviously the 5spd's can manipulate the rpm's so it wont. The reason why your car is stalling because the 96-97's haven't been reflashed like the 99 GT's. This stalling occurs because when you got it serviced, they disconnected the battery for a long time it only takes about 30mins for the ecu to not remember anything. I had this issue and it drove me crazy and my friend too. We both have 96 GT's with the 4r70w.

It really becomes an issue because if the motor is warm, it wont hold an idle. You have to start the car from dead cold start, and drive it around for 25-35 mins, you can't turn it off. Dont go on the highway either, it wont do anything. You got to drive it around town with stop and go traffic so the computer can learn fuel trims.

It probably sometimes happen in Park, sometimes in Reverse, and in Drive. It really depends on how long your battery is disconnected. For example i disconnected my battery to do some maintainence for 5 min, I lost my idle for when its in Park. I just did what was mentioned above, and it cures the stalling. Try this! and PM to see if it works. I helped a few others with this problem including my friend.
 
One more thing to check (there's ALWAYS one more thing)...and it's simple.

Remove and clean the IAT sensor from the air cleaner outlet tube. The wires/filaments are quite delicate, so use a small painter's brush to gently clean them off with alcohol or carb cleaner.

I had the same symptoms with my '96. Problem solved after doing the above.