Silly idle adjust question for Holley 4160 - Team Camaro Tech
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post #1 of 9 (permalink) Old Jan 4th, 12, 04:26 PM Thread Starter
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Silly idle adjust question for Holley 4160

Although she is running good, I did notice I cannot lean out idle to stall engine on the passenger side. Driver side adjust does lean out till she stalls.

Intake is a dual plane and gasketed accordingly.

So - I'm thinking the idle air intake passage might be clogged (if you got a good memory, I am the guy who had the orange paint chips in the carb...).

Am I missing something more obvious?? It should lean out till it stalls on both sides, shouldn't it??????

Thanks
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post #2 of 9 (permalink) Old Jan 4th, 12, 04:38 PM
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Re: Silly idle adjust question for Holley 4160

Yes and no Scott! If one idle mixture screw is too far out you might be able to shut down the other without it stalling.

You need a baseline to start where both are the same turns out 3/4 turns to 1 1/4 turns should be ball park and I find a proper tune ends up closer to 3/4 turns. Example; start both at 1 1/4 out and close each 1/8 turn at a time and see what happens.

If your idle adjustment is (throttle butterflys) are too far open the idle mixture screws will have little or no effect. Same if the secondary butterfly is open even just a little.

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post #3 of 9 (permalink) Old Jan 4th, 12, 05:14 PM
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Re: Silly idle adjust question for Holley 4160

If both screws are close to optimal then yes, you should be able to kill it from either side. If you are that far out of whack with one side that you cannot observe this, your plugs should be telling you.

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post #4 of 9 (permalink) Old Jan 5th, 12, 05:17 AM Thread Starter
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Re: Silly idle adjust question for Holley 4160

Driver side adjust likes to be approx 3/4 out for max vac/best idle. Passenger side wants to go on in, about 1/4 out for max vac. Taking passenger side all the way in only produces a rough idle.

In addition, I have closed the secondary in order to get proper primary transfer slot exposure.

I originally was thinking passenger side was a little too rich from lack of air at idle, but now i got to wondering if the driver side is too lean - basically a little confused how the PCV and brake booster tie in to dual plane intake. Figured they would need to be isolated to one side or the other.

Plugs look fine - I really can't see a difference. I do notice on a cold morning that the passenger side exhaust is visible for a much longer period of time than the drivers side!!!

I appreciate the help - she does run well, I was just a little perplexed why the two sides were different.
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post #5 of 9 (permalink) Old Jan 5th, 12, 12:29 PM
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Re: Silly idle adjust question for Holley 4160

Sounds like it's time to take the carb completely apart and verify everything, then put it back together.
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post #6 of 9 (permalink) Old Jan 5th, 12, 04:29 PM Thread Starter
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Re: Silly idle adjust question for Holley 4160

Yup - thats what I was thinking. Just wanted to make sure I wasn't overlooking something obvious.

Thanks all for the input.
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post #7 of 9 (permalink) Old Jan 10th, 12, 07:05 AM
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Re: Silly idle adjust question for Holley 4160

When you do take it apart, separate the metering block from the main body and check the flatness of the main body. It's common for Holley's to warp and create leaks between passages on the metering block. In my case a machinist flattened up for me for 20 bucks a side. Mine where nearly 0.030 out, where less than 0.007 would be ideal.

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post #8 of 9 (permalink) Old Jan 10th, 12, 07:26 AM
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Re: Silly idle adjust question for Holley 4160

I would say to begin with that your jets are out of range? Might check to see if your pv is not opening up on you. Whats your combination? sbc/ bbc etc?

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post #9 of 9 (permalink) Old Jan 10th, 12, 08:48 AM
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Re: Silly idle adjust question for Holley 4160

Pull each idle mixture screw completely out to see that neither one is bent or grooved on the tip. If one is, replace them. I've had bent one on Qjet before.

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