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Discussion Starter · #1 ·
Hey everyone, so my car has been acting up recently and i can't seem to pin point what the problem is. When the car is warm it stumbles over itself and misfires badly when given any throttle. And the weird thing is it comes and goes when the engine is warm, it will do it for a few miles and them be terrible. Under full throttle it misses really bad and i have to back out of the throttle and limp it along. So far the Distributor has been replaced around 6k miles ago as well as the plugs. The wires were just done about 200 miles ago. I'm thinking it could be TFI related or the ignition control module underneath the air filter. The fuel pump was just replaced with a walbo 255 unit so no trouble there. And the vacuum is fine it pulls 18 inches at idle. So what do you guys think? I tried running codes but all i got were EGR and smog pump which are no longer on the car. That was both KOEO and KOER.
 

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Discussion Starter · #2 ·
preaching to the choir here guys..
 

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Was any of the upgrades done before the problem started? If yes, I would start there.

Easy things to do:
* Check timing
* Clean MAF: Use a pipe cleaner and MAF cleaner and rub the sensor elements.
* Make sure fuel filter is not installed backwards. If old, replace it. It may be clogged.
 

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I'm thinking it could be TFI related or the ignition control module underneath the air filter
They are one and the same. Did you mean the ignition coil as well as the TFI (Thin Film Ignition) module? Ignition coil would be where I would look first. If it's OEM you might just want to replace it.
 

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Discussion Starter · #5 ·
Well the thing is the car runs fine when its cold and pulls to red line no problem but when it warms up it runs like crap, missing and falling on its face etc.. i'm thinking its the ignition control module.. i had it tested at autozone when it was cold and it passed but if it were warm i think it would be a different story i dont think it would pass. If it were the coil wouldn't it just quit all together?
 

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Discussion Starter · #6 ·
Alright guys so i replaced the TFI module with a motorcraft unit and it took care of the stumble under load at high rpm but now i have a stumble at low rpm.. wtf!! i hate ignition systems.. Ok so now when taking off from a dead stop normally it will start cutting out and misfiring like a sob but as soon as it gets to about 2500rpm its completely fine.. I checked the timing tonight with the spout out its at about 10.5/11 degrees so that's normal. I also cleaned the MAF like previously stated. So what do you guys think now? The only thing left really is the dizzy or actually the PIP, but shouldn't the computer throw a code for a PIP failure? there is a code for it i see but i get nothing. Besides that maybe a fuel injector?
 

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You have to narrow it done to one of the following four (Air, fuel, spark and compression). Like I mentioned before, was the car running fine before you did some work on the car? If yes, then you need to start there.
 

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Discussion Starter · #8 ·
ok so i just got done ohm testing all the wires and they spec out at the mid 6k range. I had the multi-meter set at 20k ohms. These are the Ford Racing 9mm wires by the way. It was weird when i tested them though, the multi meter would read a constant mid 2k and then if you wiggled the probes it would spike to 6k and come back down to the 2k reading. I had a old el chepo plug wire from advance and it read a constant mid 6k ohm without wiggling the probes. What do you guys think? the Ford wires all did the same thing.
 

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ok so i just got done ohm testing all the wires and they spec out at the mid 6k range. I had the multi-meter set at 20k ohms. These are the Ford Racing 9mm wires by the way. It was weird when i tested them though, the multi meter would read a constant mid 2k and then if you wiggled the probes it would spike to 6k and come back down to the 2k reading. I had a old el chepo plug wire from advance and it read a constant mid 6k ohm without wiggling the probes. What do you guys think? the Ford wires all did the same thing.
Found out today that my MSD ignition coil which was sent to me 1 1/2 yrs and 8k miles ago went bad. I'm willing to be it was the culprit of my issues over the past X amount of time since I had it on the car. They sent it to me cause the other coil has started to leak some brown gel stuff out of it. Last night after i stopped and went to start the car back, it wouldnt start but would crank over. I let it cool off for bout 15 mins and it cranked good and didnt start. Did it again and it didnt wana start but as soon as I heard it try to catch I gave it a little gas and it caught.

This morning same thing went to crank and it crank and crank and didnt wana start so i gave it some gas when i heard it try to catch. On the way home of a 2 hr drive it would stumble in 5th gear going 65 going up hills and still did it some in 4th gear going bout 45-50. At one point i had to drivein 2nd gear going about 20 for 20 minutes. Car would stumble and buck and jerk. For bout 20 minutes it did that then it smoothed out and for bout 20 miles drove normal. Stopped at a red light and car cut off and wouldnt start back. Pushed it into gas station lot and played with for an hr and wouldnt crank. Tried a new module from parts store and still same thing. I wouldnt have thought the coil was on the way out but good thing i had another in the trunk. It was an older MSD coil, one of the first ones I bought. Car fired right up. I took that off yrs and yrs ago because it appeared the tip had started to chafe some, losing its full tip.

So I wanted to create a thread and might still do on how long guys ignition module has lasted and if still going. My car has about 182 k and still stock module. Stock coil i ended up putting back on today after hearing about MSD troubles so basically my dizzy, coil, and module are all stock and still rolling. I always keep another coil in the trunk and I might just need to go ahead and keep a module in there as well, and maybe a dizzy from junkyard just in case I get stranded and wana trial and error.
 
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