Rough idle on cold start up

[Gaz64]

I don't see anything "wrong" in your settings.
Interesting that both temp sensors read about 70F higher than actual.
Maybe a poor female at the module plug?

[dstrosbe]

My guess is that my thermostat just went bad. All of my gauges and the controller are all reporting high temps so I don't think this is a sensor issue.

[dstrosbe]

Checked with my mechanic and the thermostat is brand new. Seems like an odd coincidence that it'd overheat for the first time right after the timing control was enabled.

[dstrosbe]

So I set the idle AFR to 11.5 again and the overheating issue is gone. I don't want to run this rich all the time though. Is there anything else I can do to counteract?

I guess I slowly increase the Idle AFR to see at which point the overheating issue returns?

[msdtech1955]

email me a daytime phone number

msdforms@msdperformance.com

[Gaz64]

I would be VERY concerned with a true ECT of 253F.

Either the engine had timing way out to overheat like this, or coincidence that correct A/F and timing makes it overheat?
Rich A/F of 11.5 cools it down, so what is done to the engine to bring up this scenario?
Engine specs please?