surging idle
Hello all,
Ok i ust got my Fitech 30004 and I am having tuning issues. I saw a post in the past addressing this but it was never clarified. I have a 67 mustang with a 302 engine . Edelbrock Performer cam, Air Gap intake, and a stall converter.
So here is my issue on a cold start it starts and will rev a little high. then it will drop then rev up to about 2000 rpm. I put a vacuum gauge on it and I am only pulling about 12hg of vacuum. I tried to clock my distributor and get more vacuum but it only made things worst and my engine overheated. I tried to adjust the screw on the front it didnt change anything.
I have checked for vacuum leaks and found none
Any thoughts
I dont know if it makes a difference but the overheating occured while i had the vacuum gauge connected to throttle body
Sure sounds like a vacuum leak to me if you are idling at 2,000 RPM plus. Make sure you have plugs on all the vacuum ports - think they're are three. I backfired once & one had blown off. You can spray carb cleaner "carefully" when running - if RPM increases you've found your leak.
Good to hear that I am not the only one that had a backfire and blew the vacuums caps off. It has happened twice to me. I since added clamps to the vacuum plugs.
I agree, the only time I have had such high RPM at idle it was when the vacuum plugs were off. However, make sure your IACs are right following Fitech's recommendations. Also, make sure your secondaries are returning. You can try pushing the secondaries close when you have the high RPMs to see if that reduces your RPMs. This has happened to me. Also try tapping the gas pedal and see if it goes back to idle. This would be another sign that the secondaries need adjustment.