Hesitation and high KR Cold weather issues?
- Thread starter ShoBoat
- Start date
No misfire code, however I did look deeper into the logs from last night. And it looked like it was cylinder #6 that is the culprit. I decided to swap the coil packs from 4 to 6 and took it out again. It did misfire again once in 2nd gear. (the first pull) Then it was gone, I mean totally gone. Try as hard a I could to get it to and nada??? From a dig to quite fast 
several times. And several 2nd to 4th gear pulls. Got home and looked at the logs and cylinder #6 had one demand misfire on the first pull (2 actually). Then completely normal. So I am guessing 2 possible causes at this point. The injector was dirty and suddenly dislodged what ever was in it. Or a bad wire or connection to the coil pack on #6. Any further insight would be great.
BTW thanks for all the ideas. Bouncing stuff off you guys has been very helpful.
several times. And several 2nd to 4th gear pulls. Got home and looked at the logs and cylinder #6 had one demand misfire on the first pull (2 actually). Then completely normal. So I am guessing 2 possible causes at this point. The injector was dirty and suddenly dislodged what ever was in it. Or a bad wire or connection to the coil pack on #6. Any further insight would be great. BTW thanks for all the ideas. Bouncing stuff off you guys has been very helpful.
So I decided to look closer at the wiring on the #6 connecting to the coil pack. I checked the wiring and cleaned the connector with some contact cleaner. Nothing obvious here. I did decide to for a joke swap the #6 plug with the #4. Keep in mind that this is the second set of plugs I put on the car this spring. The NGK's could have been fouled as they had 10K of hard km on them. I then bought a set of SP534 from Ford. And guess what Not a single event on #6 during the drive. There were a few non demand misfires on the #4 though. So it may very well have been a freaking plug. Not discounting the fact that I also cleaned the connector on #6. I will keep an eye on it over the next few days and just to make sure that it was the plug. If it was I should eventually misfire again. Only time will tell.
Livernois Motorsports
New member
ShoBoat said:Yup thanks guys for your ideas again. If this helps someone else avoid a little frustration.....
Glad to hear you have found the culprit. We were confident it was not tune related from start. This is a perfect example of why we do not revise tunes for a vehicle that is most likely having a mechanical problem. We would rather help find the root cause of the issue than make a bad aid tune to appease a customer.
PokerMunkee
New member
What does a misfire feel/sound like?
Hopefully its a permanent fix SHOboat,and would avoid any type of B.G induction service to say the least,another note to mention is when i changed my plugs recently found a significant amount of small particles of salt,rocks,dirt between the coils probably from the harsh winter we had,after noticing this the ocd in me took over and grabbed a vacuum and tried to clean the area where the coil sits in,not providing a proper seal if anything is lodged in,or having particles fall inside the spark plug well for sure will cause any potential issues to arrise.Z
I was going to post the logs, however I forgot to save the file last night and the battery died on my lap top. This is looking less likely to be an injector issue. As it is happening across different cylinders. It is strange that when it occurs, it only shows on one cylinder. But it does jump around, first pull was cylinder #6 then 5 and the 1. This is getting beyond frustrating. And the worst part about it it that its a random occurrence, I drove it all yesterday during the day. Didn't do it once, then at night it started back up. Now that I think about it once the outside temp is cool or cold it seems to misfire more frequently. That is the only difference that I can think of. It is cool today I will try a few more logs adding in a few more PIDs to get a better picture.