engine surge at idle - Team Camaro Tech
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post #1 of 4 (permalink) Old Sep 14th, 04, 05:03 PM Thread Starter
 
Join Date: Mar 2002
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I just replaced my 750 Holley with a new street avenger 670. I still have the same problem, a slight surge up and down at idle, and engine wants to idle back down to slow. I have check for vacum leaks, and checked the timing. Both are ok. What else can it be?
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post #2 of 4 (permalink) Old Sep 14th, 04, 05:30 PM
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Location: Austin, TX, USA
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Plug the PCV line and see if that helps. The PCV valve is essentially a flow regulator. It could be that it is flowing too well and acting like a vacuum leak. A different PCV valve may fix the problem. But disconnecting it should tell you something. If it don't change, it probably isn't it. Also make sure your mechanical and vacuum advance are working properly. If the mechanical advance is kicking in too soon or the vacuum advance can is too tight, RPM changes will cause timing changes.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #3 of 4 (permalink) Old Sep 15th, 04, 05:59 AM
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Matt Jones
 
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What ignition curve are you running? Where does the curve start? Is your vacuum advance at full vacuum?

Also, pull the carb off and tell us how much of the transfer slots are exposed. They should appear square.

What cam are you using?

Matt Jones
Lead Mechanical Engineer
Art Morrison Ent. Inc.
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post #4 of 4 (permalink) Old Sep 15th, 04, 05:30 PM Thread Starter
 
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Found the problem, It was the fast idle cam adjustment.
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