pastfast125

I wonder if it's possible that the sensor is bad or for some reason isn't working when it gets hot, so I'm running off base timing at idle, but for WOT the computer isn't advancing the ignition so the cut I'm getting is just like a rev limiter that cut's the ignition?

NoGo95GT

Again, this would lead to the distributor. I posted an article on the last page. I wasn't sure if you got it.

Tony71502

Running rich for how long?? I bet all that wasted fuel adds up to 02's and extensions...

pastfast125

Not when I hardly drive the car. Enough with the o2 sensors. The car is being traded as soon as I get it running right. I already have a deal worked out. Telling me I should have o2 sensors is stating the obvious and not getting me any closer to fixing my current problem. yea NoGo95gt, I got the page, thanks! I may see if I can find somebody to let me borrow a dizzy to see if that fixes it.

NoGo95GT

I agree, if your car ran fine without O2's, then they are not to blame. Your problem is ignition related. I am sure you can also check local junkyards or even some Mustang shops around your area for a used Dizzy. If $$ is real tight, you can rebuild the stator/Hall-Effects sensor, but it is a bit tedious, so I have read. But I think you can get the kit for around $50. Good luck!

pastfast125

Hmm, Dizzy didn't fix it. I will be putting o2's in very soon.

It definitely seems ignition related. Seems as if the ignition is not advancing or is retarding under load in higher rpms. All of this seems to be mostly when Hot. Also, when I am cruising under 2,000rpms and hold it at very slight throttle, it accelerates ok, then if I give it anymore it hits a flat spot. It makes more noise like it's under load but doesn't go any faster, then if I push the pedal further it'll get past the flat spot and pull just fine. The car also when hot has a hard time taking off in 1st. I have to get the R's up pretty high to avoid stalling. It doesn't have any of these problems cold.

Any suggestions? How does the computer control ignition advance? How can I check to see if it's properly signaling the required advance?

Thanks for your help guys. I really need to get this thing running right and sold.

NoGo95GT

Hmmm.....I would have bet my life that it was a bad dizzy. What dizzy is it(remanufactured)? When mine went bad it ended up being a brand new remanufactured Autozone dizzy. I think it's time you pull some codes and see where that takes you. Run codes with the car on and with it off for best results. I'd go to Autozone for this.

pastfast125

I can't pull codes. My car is such a hack job electrically. I've tried codes before and I couldn't get it to read anything.

Plus the car has no emissions equipment whatsoever, so if I Could pull codes I'd have a million of em.

I think it's something along the lines of the electrical between the computer and TFI and the spout connector and what not. I read that at WOT the computer bases ignition advance solely on % load and Coolant Temp. Though I'm not sure that it's cutting out only at WOT. It's probably more like 3/4 throttle and up, maybe even 1/2.

I'm just trying to figure out how to relate the problem to engine temp cuz it has problems mostly when it's warm. Maybe it's something to do with the coolant temp? Is the sensor mounted on the black tube on top of the intake on the passenger side? Maybe my sensor is bad? I don't know, it could be a million things.

NoGo95GT

Your problem is ignition related. And I hate to beat this to death, but your symptoms are identical to when my dizzy was bad. It did not cut out bad when it was cool, and it was 1/2 throttle+ when it occurred. It's such a pain figuring these gremlins out. I would still pay attention to the distributor area. Maybe you have a bad ground connection or something like that. Were the things you added(TFI, plugs, etc) prior to this problem or attempts to solve the problem?

pastfast125

Prior. I'm gonna figure this out with diagnostics. I hate just throwing parts at it hoping it will work. Tomorrow I'll whip out the DMM and see what I can figure out.