3.8 in my T-bird running rough for a short while...

Topic: 3.8 in my T-bird running rough for a short while... (Read 2233 times) previous topic - next topic

3.8 in my T-bird running rough for a short while...

Reply #15 – March 14, 2006, 11:10:01 AM

If the check engine came on it should have stored an error code.
Run the self tests and see what you have.

3.8 in my T-bird running rough for a short while...

Reply #16 – March 15, 2006, 09:48:35 PM

My 3.8 experience.

1) Sitting at a light years ago sometimes produced a thump from the engine--or so my wife kept reminding me. Later find out that wires to the drivers side bank of plugs were misplaced/misaligned. Believe it or not, there is a protocol on that. Take a close look of the objects on that side--I think there is a large engine bracket near the dip tube (lacking memory at this moment) which can interfere with electrical discharge if the wires are not aligned right through that space. I recall shifting the wires---and the thump (misfire) disappeared and has not reappeared since (that was over 50,000 miles ago...). I am very careful about wire routing for this reason. It is just a experimental/judgment approach (at least in my case).

2) Older wires become susceptible to moisture penetration. If you go out on a damp, moisture laden day and start the engine with old wires, you may find that the engine runs poorly or may not even start due to misfire or lack of spark. Good ignition wires are a must. Ditto for the plugs. In my opinion, watch out for wires over 5 years old plus--especially original ones.

3.8 in my T-bird running rough for a short while...

Reply #17 – March 15, 2006, 10:43:14 PM

The amazing thing is, plug wires usually are the first thing to need replaced on an engine...
In '02 I put a rather expensive set on my truck (92 F-150-5.0/M5)
and it ran much better, as the originals had been in the truck till then.
This past winter, on a bitterly cold day, I had to replace them again, this time with a cheap set, I figure if they're going to last 3 years at a time, I may as well save some money...

Now, back to topic: I'd change the plugs, wires, and coil if you havn't already, which it appears you have.
Seeing that you have the '87 3.8, I'd also check fuel pressure, and perhaps the timing, as well...no real clue here, just an idea.