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Holley HP EFI idle issues *fix*

 
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10sec.et
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Joined: 29 Mar 2006
Posts: 3472
Location: Houston,Texas
346624.78 points


1969 Oldsmobile Cutlass

PostPosted: Mon Oct 20, 2014 11:20 pm    Post subject: Holley HP EFI idle issues *fix* Reply with quote

just thought i would post this up for those that may be either battling this or considering purchasing the HP EFI. there is a possible high idle issue or idle that takes off on its own.

Holley uses Chrysler idle air control motors on their throttle bodies but they arent always wired correctly. the system i just installed was wired for a GM idle air control motor. it would show 0% on the IAC counts in data and idle really high. sometimes up to 2800 rpm.

i fought this for a long time and, through a few resources, found out about the wiring. it took me a little bit to get the configuration correct but its only a matter of swapping around three wires on the four wire connector at the IAC. as configured, they are ABCD (marked on the connector). they must be changed to ACDB.

strangely enough, Holley tech doesnt seem to be aware of this. i spoke with them and they couldnt tell me any more than "its probably a wiring issue". the Holley HP EFI is a great system but something like this could sure make a guy trash it. i hope they get this sorted out.

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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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clay
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Joined: 24 Nov 2002
Posts: 3209
Location: South Carolina
318129.23 points


1972 Chevrolet Nova

PostPosted: Tue Oct 21, 2014 10:08 am    Post subject: Reply with quote

I hate having stuff wired wrong from the factory. My MSD boost controller had the MAP sensor wiring wrong in the connector. Good job finding that though. Bet you thought you were through with stuff like that. Clay
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I have done so much with so little for so long, I can now do anything with nothing.
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af2
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Tue Oct 21, 2014 5:12 pm    Post subject: Reply with quote

Keith!!!!

Excellent find.

I have been doing R&D as other HVAC techs on the problem the new A/C systems are having. Guess what? I got paid $400.00 for my issue fix. No more issues for me. Now the BIG HVAC COMPANIES that everyone uses have now implemented new PAG oil..
I want to know why they changed?
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10sec.et
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Joined: 29 Mar 2006
Posts: 3472
Location: Houston,Texas
346624.78 points


1969 Oldsmobile Cutlass

PostPosted: Sun Oct 26, 2014 12:46 am    Post subject: Reply with quote

drives me nuts sometimes. i didnt tell Holley whats going on. just a few close friends Wink
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Big Dave
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Joined: 04 Dec 2005
Posts: 2644
Location: Tampa Florida
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PostPosted: Tue Oct 28, 2014 3:30 pm    Post subject: Reply with quote

Thanks Keith I will keep this information under wraps. Of course hiding it from Google is going to be next impossible unless we take it off the board before Google mines the info with their crawllers and send it as a PM to members who complain about the problem.

By the way does this apply only to the Holley TBI EFI or does it include the newer port injection manifold as well?

Big Dave
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