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| Woodstock | IAC valve 87 vs 91 tuning issues | ||
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Senior Guru
 
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I am helping a friend tuning his 87 with LT4 hotcam, BBK TB, Trickflow heads and Lingenfelter intake.
He always had trouble shifting into gear (TH700) with stock converter. Now I had enough of "160-full open" IAC counts and send him my spare 91 IAC. Previously he used both of his 87 IACs. Sure enough now the IAC works as it should, but the tune still needs some work. Now the question. Could it be, that using the 89 ARAP code could have ill effects on the 87 IAC, but working correctly with the 91. I believe 88 was an IAC number change, but was the IAC really a different animal? Usually I am not a believer in GMs part number system, but this one has left me stumbled. |
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Posted on: 2010/3/3 1:41
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91 convertible |
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| bogus | Re: IAC valve 87 vs 91 tuning issues | ||
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Grand Imperial Pooh-Bah
 
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hm... According to NAPA, they are different parts... I would also check the condition of the harness. The 80s vintage Vettes wiring can get ignorant.
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Posted on: 2010/3/3 4:50
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| anesthes | Re: IAC valve 87 vs 91 tuning issues | ||
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Master Guru
 
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Quote:
The wiring was reversed. This was the topic of debate for a number of years on the diy_prom board at TGO. I'm not 100% convinced I believe it, but I also can't explain the difference in part numbers on the IAC motors... -- Joe |
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Posted on: 2010/3/3 11:10
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