Re: Holley Avenger Problem
I chased the same problem when I was getting my 670 Street Avenger set up. It sounds like the idle mixture may need to be tuned some and you may need your ignition timing tweaked. I know they say they're set up for most applications "right out of the box" but don't rely on that. My mixture screws were too far in.
First off, make sure your timing is set correctly. I'd say around 14-16 degrees initial unless you know for sure what your motor likes and how much mechanical advance you've got built into your distributor. Then make sure that you have a good set of double return springs on the throttle so that it is seated all the way at idle and make sure your accelerator arm is not hitting the back of the valve cover.
If your cam allows it and you can get it idling around 700-800, put a vacuum gauge on the small port just underneath the front passenger side edge. Don't use the upper small port as that one is not full manifold vacuum and will only give you a reading with the throttle open. Now use a small flathead screwdriver and turn one idle mixture screw out a small amount at a time (eighth turn) and see if your vacuum reading goes up. If so, turn out the other side the same amount. Go back and forth until the vacuum stops going up. You may also need to adjust your idle screw while doing this to maintain idle. If you don't have a wideband AFR monitoring setup, this is about the best you can do to get the idle mixture set. Also, if you turn it out at some point and don't see the vacuum change, turn it back to where it was.
BEFORE you do that above, you may need to make sure that both idle mixture screws are set the same beforehand. They are supposed to be but you never know. Start with one and turn it all the way in while keeping an accurate count of how much. It will probably only be about 3/4 turn. Then turn it back out to where it was initially and do the same to the other screw making sure that they are both out the same amount.
That's the only thing I've had to do with mine so far. I'm sure it could use some tweaking but the car is running good and the plugs are showing brown/tan.
Oh yeah, and the vacuum gauge reading should be fairly steady. If it's not, that'll point to other issues. They carry a nifty little one with rubber tube attached at most parts stores.
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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Last edited by Steiner; Oct 5th, 09 at 07:34 PM.