C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Questions for those tuning an 86 computer.

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Old Jul 15, 2002 | 03:54 PM
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qkvette's Avatar
qkvette
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From: simi valley ca
Default Questions for those tuning an 86 computer.

i've updated the following table :
closed loop iac target rpm vs. coolant temp table.

should i also adjust the warm IAC park (steps) vs. temp ?

to help improve the idle.

thanks,

joel
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Old Jul 16, 2002 | 11:59 PM
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HighHopes85's Avatar
HighHopes85
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From: Lafayette IN
Default Re: Questions for those tuning an 86 computer. (qkvette)

closed loop iac target rpm vs. coolant temp table.

should i also adjust the warm IAC park (steps) vs. temp ?
Rumor on the street is that there is a hard-coded max value for idle RPM that can be a real pain in the tailshaft to work around. If I haven't forgetten everything I learned, it is going to be around 800-850RPM, and it applied to the mid to late 80's ECMs. In other words play with those tables...if you want your idle to be above 850 and you can't get it there once it i warmed up, think about that.

I agree with Doc and the IAC steps--shoot for 10-20 counts and she should never stall out on ya or give you a hellatious 'vacuum leak' to deal with. Good luck, -Matt-
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Old Jul 17, 2002 | 12:23 AM
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Corvette86
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From: Russellville TN
St. Jude Donor '06
Default Re: Questions for those tuning an 86 computer. (qkvette)

Joel,

It has been my experience on my 86 vette that messing with that table won't solve you idle problem. Beg, borrow or steal a scanner and post the results in this forum. Then let us take a look at what your ECM is seeing.

Frank
86vette
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