IAC longevity problems

[andy quaas]

I had a 4Di and the IAC went bad (created a hard staring cenario)
while i was in the backwoods of WI.  According to the holley manual,
it checked out OK.  About 1 week later, my ECU actually went up in
smoke.  Guess what went?  The IAC driver.  So i got a GM puter and
another IAC to use with my 4-bbl holley TBI.  Works great.  Are your
replacement parts black?  The new IAC that i got is larger in diameter
and a bit longer than the original one.

andy Q


---MJones <rmjones at cyberhighway.net> wrote:
>
> Hello, all:
> 
> I have a Holley Projection 4D in a marine application which works
very well 
> except for one bothersome problem:  I can't keep IAC motors alive
for more 
> than a few hours.  The IAC used on the Projection is common to
Chrysler 
> and, I think, GM applications.  The second one just trashed after
about 4 
> hours of engine operation.  Both failed the same way.  Electrically
it 
> seems to work fine, but the threaded rod attached to the pintle
seems to 
> cock and stick.  Wiggling it slightly frees it up until the next
time it 
> sticks.
> 
> I've checked the obvious things.  It's not binding in the throttle
body, 
> causing it to wear.  It dosn't get terribly hot, since everything, 
> including the exhaust manifolds, are cooled to 160 degrees.
> 
> Is this a common problem?  I wouldn't think so based on the number
of them 
> in service.  Any ideas or suggestions?  Did I just by coincidence
receive 
> two defective ones?  Holley is no help.
> 
> Thanks,
> 
> Mike J.
> 
> 

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