On a stock bin, what air temp does the AT sensor need to read to go into closed loop? Can this be changed in Tunercat? I am running 6E code. Today on the way to work the engine would not get off high idle, coolant temp was normal, outside air temp was in the 50s here. So I am guessing that in the AT sensor was reading about 70-80ish. I don't have egr and did a TB bypass, so on a 70 degree day my AT reads 90s. Any ideas?

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1988 L98
Vette Heads/no EGR
SLP Headers/Y-Pipe
ARAP bin

 

The air temp sensor has no bearing on when it goes into closed loop, but the coolant temp does (usually 100-122 degrees F in TPI applications). Sometimes, it takes a few seconds, or even up to several seconds, for the computer to close the IAC motor to allow the idle speed to drop down to normal.

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Greg Westphal
'87 IROC 355TPI/A4

 

Darn!!! that's what I was afraid of! My coolant was in normal ranges, the motor high idled all the way to work, over 40 min if driving. The car ran fine last night??? I burned a prom yeasterday afternoon to add a little fuel. Maybe that freaked something out.

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1988 L98
Vette Heads/no EGR
SLP Headers/Y-Pipe
ARAP bin

 

I just had another thought, maybe my return spring has gone south. This happen to my friend and it took forever to figure out because it was so simple...

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1988 L98
Vette Heads/no EGR
SLP Headers/Y-Pipe
ARAP bin