93 LX missing allot.

[93 LX]

Over the past few days my 5.0L HO stang has been missing around 2 grand. This happened once in a while. Today while driving in heavy traffic the missing became more noticable and more frequent. It seems to have gotten worse the longer I drove the car. By the time I got home, the engine was missing at idle. I noticed each time the engine missed the stock tach would drop to 100 rpm then jump back up to what it was before. I was thinkin git may be the TFI module but there could be other issues as well. Any ideas would be great. Please help the ole stang!

Allen

 

[5.0Droptop]

first try checking codes.
it may just be time for a tune up.

 

[bmorrisj]

PIP/stator in the distributor could need replacing....

 

[88_GT_5_oh]

cap and rotor would be the first thing i would change, one or two wires may be bad also..... just my 0.02

 

[1991GreeNLX]

yep mine was doing the same thing so i changed the plugs got some new FRPP wires and MSD distrubuter cap and rotor works great i would say one of your wires would be jacked up from inside

 

[trbkrb]

Mine was missing similar to yours. It progressively got worse from a miss around 3,000 rpms to it missing every few seconds at idle, especially when hot. Changed wires, cap, rotor, TFI, with no difference. I borrowed a friend's distributor to test on it, and it ran fine. Ended up being the pip/ stator like bmorrisj mentioned.

Good luck!

 

[93 LX]

Update

After I got home last night I fired the Stang up. Well it ran great till the engine got warm. Then the missing started up again.

I know how to change the TFI but how difficult is the pip/stator?

Allen

 

[trbkrb]

You have to pull the distributor, have the gear on the bottom pressed off, then disassemble the distributor to replace the PIP/Stator assembly. A friend that is a Ford technician told me to ONLY use Ford parts as he has seen the auto parts store ones fail much more often than Ford ones. My original one lasted a good 247,000 miles and 17 -1/2 years before it failed. I ended up buying a good used distributor from a friend and just swapped it into my car. $20 sure beats spending the money for the Ford part which I believe was close to $90 or so.

Try this, if it is running fine cold, and starts missing when warm, either run some cold water on the distributor base carefully from a hose, or otherwise put ice around the distributor base to cool it. I tried that and it started running fine again until it heated up a few minutes later. That was how I figured out it had to be the PIP/stator in the distributor.

Good luck!