RMarsden

What do you think?

My '89 Mustang will stall after 15-20 minutes, once it’s warm. (It’s completely stock and has always run perfectly.) It doesn't matter if I'm driving it or not - it stalls sitting in the driveway, going 70MPH down the highway (giving it gas) and while sitting at a light (revving or not as I've tried both). Both the battery gauge needle and the tach suddenly fall to zero and it shuts off, sometimes those two gauges will drop like it’s going to stall but the engine will kick back up and keep running. But once it starts stalling, it become more and more difficult to restart. It never did this until the Mustang shop I bring it to, did some tuning, replaced the EGR sensor and adjusted my idle, leading me to believe that it is an electrical problem, maybe the work they did uncovered a problem? (The thing is, is that they keep telling me they can’t get the car to reproduce the problem - it does it without fail for me every time I drive it. So either they can’t figure it out or they just don’t want to spend the time on it. I feel like I’ve been thrown out into the cold!) I've also had the following recently replaced: alternator, voltage regulator, battery, battery cables, starter. It's not the fuel pump as I can hear this every time I start the car. And if it is a fuel problem, why doesn't it occur instantly? Why wait until the car is warm? Maybe a vacuum leak?? I am completely frustrated. I would really appreciate any suggestions!!!!

Crazyfast50stang

Dude I have the same exact problem. I took it to a shop and they told me the same thing. I also think it is a fuel problem. Im thinking something to do with the fuel pressure. Im going to get a pod holer for the fuel pressure just to test it out. I tried adding th fuel cleaner, and I do mean a lot of it over a period of time, but that didnt help at all. It could be electrical which is the next thing i'm going to try, maybe my ecu has a virus? No I'm jk. Good luck and tell me if you figure it out, I will do the same once I get to the bottom of it.

RMarsden

Uh oh, CrazyFast...what do you think??? Could this be our problem???

http://www.theautochannel.com/news/2...26/031514.html

stanglx2002

i think its either the ignition mudule or the ignition switch

if you get a new module make sure to put dielectirc grease on the back of the module so it doesnt over heat and stall the car like they are talking about

Crazyfast50stang

Well im screwed cause I have WAY more then 100,00 miles. I think I will go after the ignition module and see if that helps any. Good luck and I will get back to you on how everything goes.

RMarsden

Thanks StangLX...I'll do that!

RMarsden

CrazyFast, me too, I've got about 160K on mine. I found this article that explains at the bottom how to replace it youself: http://www.coolcats.net/tech/troubleshooting/tfi.html

I'm going to do that hopefully tonight, and I'll let you know how it goes!

HarleyTruck

Did u check your Idle Air Control unit i have heard of them clogging up and making engines stall. mine does the same thing but only once in a while.

87mustang347

my biddy had the same problem with his car and he changed his o2 sencors and it fixed it. something about when the car warms up, it goes into open loop or closed loop, i forget which one, and messes with the computer. is youe cel on?

Crazyfast50stang

Alright RMarsden good luck. I'll try that this weekend hopefully. The thing with the O2 sensor is that I dont have a check engine light. I'll see about the air idle control unit also. Maybe clean it out or something. Thanks everyone and good luck to you RM.