Rough running

[Billy Mild]

I drove the car this morning and it had a high idle(1200-1500). I shut the car off and restarted it, and it ran smooth as silk and the idle was completely normal 700-800 RPM.

[XfireZ51]

Originally Posted by Billy Mild

I drove the car this morning and it had a high idle(1200-1500). I shut the car off and restarted it, and it ran smooth as silk and the idle was completely normal 700-800 RPM.

Billy,

U went thru the reset for the IAC.

[Billy Mild]

What is this integrator number?

When decelerating to a stop when in gear I notice the BLMs go to 110-120. I assume this is Marc's way of doing anti backfire mode.



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[XfireZ51]

BLM - Block Learn Multiplier - This is the long term fuel trim

INT - Integrator- This is the short term fuel trim.

Over time changes to the INT cause changes to the BLM. Usually these two tend to move in opposite directions so if the BLM is > 128, the INT will try to drag the BLM towards 128 by going the opposite direction.
Disabling DFCO allows fuel to be introduced during decel. DFCO would have cut it off for emissions purposes but then that also creates a situation to where fuel does not get "turned back on" quickly enough and so u get a stall. When n DFCO, the BLMs would lock at 128 since you are basically out f C/L.

[Billy Mild]

I was wondering is somehow fuel on occasion is pooling up in a shut secondary port then when I get back on the throttle it stumbles due to being way too rich.

After testing with a NOS ECM my car seems to run much smoother than with my ECM. I also noticed that BLM numbers are closer to what I would expect.

I need to find a place that tests and fixes these ECMs.

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[XfireZ51]

The ECM only carries out the programming that the prom has on it. It is not its own entity. Datalog it and see if there's any quantifiable difference.

[Billy Mild]

The prom is the same. The only change is the ECM.

I did data log both runs, but I don't know how to analyze the data log from ALDLdroid on my PC. I tried to find an old thread on here about tuning to see how everyone reviews these files.

The reason why I think it might be the ECM is the issue is not consistent. It acts like an electrical issue. When it's really hot out it seems to happen more often.

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[XfireZ51]

The one thing I see in your logs is that Learn becomes disabled sporadically for an unknown reason, but that shouldn't affect much. BLMs overall appear ok, nothing bad really. I used your file on .xls to review.

[Billy Mild]

I can give you the data log from the NOS ECM and see if that looks different.

I have a feeling it will.

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[Billy Mild]

This is a catalog of my car stumbling right at the end. What I noticed is the integrator numbers were really low in the 60's and the exhaust was crackling a bit.

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https://drive.google.com/open?id=0Bz...UZFbmQyZTg3bzA