Low Timing and hesitation during cold start

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Nov 2, 2009 | 10:08 PM

#46

Clipse3GT

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From: Cleveland, OH

Bump.... hmm I will be trying this out today

Get rid of some of the cold start problems...

May 12, 2010 | 08:42 AM

#47

fostytou

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From: Aurora, IL

Quote:

Originally Posted by tephra

yeah I am not 100% sure..
52680015:

<table name="Percent Low Temp Timing Trim vs Coolant Temp" address="56170">
<table name="Engine Temp" address="610e0"/>
</table>

Sorry to bring this back from the dead.

I'm running 52680020. My car came with 52680015 and had these values:

Code:

I got an what I assumed was a factory 52680020 ROM from my roommate, and a little while ago I changed these values to this just to help a bit with cold running.

Code:

I just switched to e85 and would get a slight hesitation on warmup, so I went to pull things back drastically for this fuel. I set the table to this:

Code:

The car nearly died after starting, and would roll from rich to very lean. Any gas was VERY lean and the idle was very rough. I tried to get about a block and decided to swap this map back to what I had it at... no problems.

1) Does this have the same function / is the definition correct in 52680020?

2) This reminds me of a common problem on the CT9A. Is it possible that the same thing is happening there?

May 19, 2010 | 09:00 AM

#48

fostytou

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From: Aurora, IL

*Nudge*... can anyone try this for me or look at the code and see whats going on? Also, is this actually a retard of the timing, an advancement of it, or simply a set value (thereby retarding)? I ask because the degrees are positive and the car definitely seems to gather itself right after the transition from 3->5. I've also read that increased timing can lead to high EGT's, which could also accomplish the goal of warming up the cat (but is semi-contradictory to general tuning practices for cold conditions).

I assume it is not a set value but I need to log, however this would explain the major difference when the car hits the transition area. Its not stumbling here with the closer to stock values, but it hesitates and needs alot of throttle to go anywhere.