LS1TECH - Camaro and Firebird Forum Discussion

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-   PCM Diagnostics & Tuning (https://ls1tech.com/forums/pcm-diagnostics-tuning-7/)
-   -   Where in the tune can you fix this type of cold start issue (https://ls1tech.com/forums/pcm-diagnostics-tuning/1344149-where-tune-can-you-fix-type-cold-start-issue.html)

cjmatt 10-20-2010 05:42 PM

Where in the tune can you fix this type of cold start issue
 
is there an easy fix to the hunting for idle shown here?

http://www.youtube.com/watch?v=S4keufZdTCg

98Z28CobraKiller 10-20-2010 05:44 PM

Idle air flow table is vs. coolant temp assuming your fueling is correct.

Beau@SDPC 10-20-2010 06:20 PM

Also look at the spark advance at idle. Depending on what you have to tune with.

mattinokc 10-20-2010 09:56 PM

damn
 
I paid frost to go over my tune was worth every penny!

I had the same thing!

cjmatt 10-21-2010 07:09 AM

OK, It was just tuned. Ive been going back and forth with the tuner working out street bugs, so Ill have it fixed, I was just curious what actually caused it.

Inquisitive minds want to know!

jimmyblue 10-21-2010 04:39 PM

Cold start / afterstart enrichment can be excessive and
so can the EQ (OLFA) table especially after a cam puts
you at higher than stock idle MAP. You should be able
to tell by comparing commanded EQ against these to
see who's in charge. I had to skinny down all of them
after my cam swap. But go to far and you may get
harder starting. If the surge is still there after 10
seconds into cold start go for the EQ (vs ECT vs MAP)
first. If it's only initial and goes away quick, probably
the after-start enrichment.


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