New heads, new cam, new RPM problem - Team Camaro Tech
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post #1 of 3 (permalink) Old May 22nd, 06, 06:40 AM Thread Starter
Senior Tech
Join Date: Jul 2003
Location: Delaware, OH
Posts: 335
New heads, new cam, new RPM problem

After installing new heads and a cam I now have this issue where i can be cruising at 2800-3000 and if I immediately put the car in neutral while driving the RPMs will only fall to about 1700. At idle I'm at 1000RPM in "Park" and 750RPM in gear. Basicallt the idle doesn't seem to come all of the way back down in neutral. What does this mean? Vacuum leak? Or? If this is related to a vacuum leak then here is a list of things that may or may not help:

I don't have a break booster.
There is no RPM change when spraying carb fluid around the base of the manifold.
The idle mixture screw on the passenger side of the car makes the car slightly stumble whe screwed in all of the way. The drivers side screw stalls the car. But, it did this with my old set up and the RPMs used to drop all of the way to 750-1000RPM when going to Neutral.
The 90degree PCV from the valve cover to the big middle port on the Edel carb has a small crack in the bend of the 90 degree bend. Would this cause a substantial problem?
I have 2 piece valve covers. Would a small air leak from the gasket at the lid cause a problem? It doesn't leak oil...I'm just trying to list everything I can think that is different now.
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post #2 of 3 (permalink) Old May 26th, 06, 05:47 PM
Senior Tech
Join Date: Aug 1999
Location: Ontario, Canada
Posts: 564
Re: New heads, new cam, new RPM problem

Assuming that its a 69 with a quadrajet 4 bbl, I would venture a guess that the choke is coming on, and sitting on the high idle cam, this can because the rod from the thermostat is not adjusted properly, the choke thermostat may be loose on its mounting, or the thermostat may be just bad.
Heat riser not working proper, Port in intake under manifold plugged.
Coolant Thermostat stuck open engine not getting to operating temp.
You need to give us some more info after this..........
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post #3 of 3 (permalink) Old May 26th, 06, 06:26 PM Thread Starter
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Join Date: Jul 2003
Location: Delaware, OH
Posts: 335
Re: New heads, new cam, new RPM problem

I have an Edelbrock manual choke that is wired so that the choke never is on. I don't have heat risers, Operating temp is 190. Don't think the port under intake is plugged. Whats else could it be?
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