Hesitation and high KR Cold weather issues?

[SHOdded]

Your work is always meticulous and well-documented, ShoBoat.  Makes for a great reference point.

[SHOnUup]

Fingers crossed for that pesky misfire to rid itself from your eco.

Rich

[Livernois Motorsports]

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]

What does a misfire feel/sound like?

[ZSHO]

Did you ever have any type of BG induction service performed in the past.Z

[ShoBoat]

Did you ever have any type of BG induction service performed in the past.Z

No not yet, but I plan on it in the near future.


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[ShoBoat]

What does a misfire feel/sound like?

The best way to describe it in the SHO is almost like a popping sound and a shaking from the engine. The car will feel like it's hesitating and power will not feel smooth (obviously).


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[ZSHO]

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

[ShoBoat]

It's back. Noticed it last night. Happened to have my laptop on me. Did some logs and now it looks like cylinders 1, 5 and 6 are showing misfires.


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[ShoBoat]

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.   

[SHOnUup]

EGR system malfunction can cause random misfires across many cylinders right?

Rich

[ShoBoat]

EGR system malfunction can cause random misfires across many cylinders right?

Rich

Not sure, maybe someone can chime in. I am not familiar with the EGR system on the SHO. Just a reminder that it has 0 misfires with the stock tune. I am not sure what impact the tune would have on the EGR system.

[SHOnUup]

Me neither...looking at the generic misfire code of p0300 it points to the EGR or maybe a fuel system error.

Rich

[ShoBoat]

The misfires do not trigger a code. I guess it's under the threshold for the count. But it can be felt and it shows up for the current count on the PID for total misfires for the current drive cycle. 


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[AJP turbo]

I think u all may be reaching if trying to contribute a misfire to an egr issue...most late model cars don't have an egr valve per say like the old cars...egr is done via cam timing through exhaust gas reversion

Just my .02