Any idea what's wrong?

[Rgig]

I've got a 93 SHO automatic with 165K on it... this is my second SHO I also had a first year 89 for a while.

The 93 has been in the shop more times than I want to count and all with no resolve to the problem... which is: occasionally the engine feels like it is missing badly. Feels like it's not hitting on all 6 cylinders. If any of you know what a fouled plug feels like then you have a good idea as to what mine is doing. This occurs from a standing start and normally clears up when I accelerate more aggressively. Sluggish and then around 3,400 RPM it’s back to the good ole SHO...

This happens when it' hot outside or when it's warm with high humidity...

I've changed, the coil pack, new plug wires (expensive item) new plugs... all to no avail.

Anyone got any ideas???

Oh yea, the check engine light is on most fo the time but I've been told it's due to carbon build up in the intake... they've tried to clean it several times and it seems that within a week of cleaning... the lights back on. I don't believe this has anything to do with the sluggish acceleration.

 

[Ryan]

I've never heard the CEL coming on because of the carbon build up in the intake. That is because the SHOs do not have a PCV system on them. I'd check the ignition module and make sure it is grounded properly. That maybe a problem. I'd also check and make sure there isn't any oil in the plug wells.

Otherwise call the SHO God Doug Lewis.... www.fordspecialists.com You can tell him your problem over the phone, and 99.9999999% he will diagnose your problem correctly.

 

[Rgig]

Thanks for the input. I call Doug Monday and see if he can tell me what it is. Plugs are dry, mainly because they are new, same with the wires. Now the ignition module... maybe. But I did replace that earlier and it had no effect on it. Just really puzzles me.

See ya

 

[foreverford]

This is a dumb question but did you gap the plugs?

 

[Rgig]

Odly enough... I don't know... I had Bosh Platinum 4's in it and it could NOT pass emissions... the guy changed them back to motorcraft platinumns and it passed inspection.

But... this was happening before and after each plug change regardless of brand...

Go figure!!!


Sorry guys... I forgot to type the "not" after the "could" above (Bosh)... it's now in CAPS...

 

[sohowcome]

Wow guys with PCV's dont change them unless you have too, took my stock one out last week and now Im in a world of hurt..........