95 Eagle talon TSI #1 cylinder misfire

[RodFarva]

Please help. I have a 95 Eagle Talon TSI. The trouble light came on and the reader said it was #1 cylinder misfire. I replaced the plugs, wires, had the coil tested and said it was good. I swapped the wires from #1 to #2 and the problem followed. I put new wires on thinking that was the issue and the problem came back again to #1. I pulled the plug wire away from the coil while it was running and all seemed to spark ok except #1 didn't seem to fire as clean as the other 3. I'm not sure what to do next please help.

 

[xrdgx]

It sounds like the power transistor it's right by the coilpack

 

[RodFarva]

Does anyone know of a test for that part other than just replace it and hope it works? Thanks.

 

[blakkat]

I have a brand new power transistor with wires if you end up needing one.

 

[DEADKITTY]

+1 on the power transistor its next to the coil pack and won't be that bad to change.

 

[RodFarva]

Thank you for the hints. I'm going to try one from the junk yard (I just hope it is good and don't want to spend a lot of money). If anyone else can think of something please let me know. Thanks again to you all.

 

[Zack Huffman]

Did you just swap the wires at the coil or at the plug, or did you swap the whole wire from #1 over to the other coil and then attach it to cylinder #2?

#1 and #4 share a coil, #2 and #3 share the other one. If you swapped the whole wire from the A coil over to the B coil and actually ran it to one of the B coil's cylinders that's how you find a bad wire. If you kept it on the same coil and swapped it from #1 spark plug to #2 spark plug, then you'd have 2 cylinders with misfires.

Get out the multimeter, check resistance between the 2 output posts of the A coil (#1 and #4). Resistance should be 11300-15300 Ohms, if not, replace the coil pack.

On the harness plug of the coil pack, check the resistance between pin 3 (opposite the clip) and each of the other 2 pins (to the coils). Between pins 1-3 is coil B, between pins 2-3 are coil A. Resistance should be between 0.7-0.86 Ohms, if not, replace the coil pack.

How to check the power transistor.

 

[RodFarva]

Delta,
I did all the tests and they passed. My one friend thinks it could be a back up on the catalytic converter what do you all think?

 

[Zack Huffman]

Unbolt it and run open downpipe to see if the misfire leaves. I doubt it's the issue, but won't hurt to check.

If #1 has weak output and the coils and PT are tested good, I'd lean more toward electrical contamination at the plug, possibly bad anti-seize, a helicoiled plug hole, electrical interference, or bad contact with the wire end. Might check the ground strap from the head to the firewall also.