Help w/ rebuilt engine - vacuum rises w/ rpm

[vristang]

Alright.

Wanted to say thanks Vri, I got my Mass Air Sensor in today ($27 shipped off ebay) and got it on the C & L. The car runs pretty good - no dogging out at all, so that was the issue. It only has a VERY slight idle surge where it bounces from about 650-700 to around 800 or so, no big deal and is probably due to the E303 cam. I might try turning the C & L and see if that makes a difference.

The weird thing is that I'm pulling like 19hg of vac at idle; the idle might be a little higher than stock, though(700ish). Before the rebuild w/ the same cam, I was pulling about 14.

Good to hear you got it working.

Thank you for coming back to let us know how things went

It may take a few miles for the computer to fully adjust to the new sensor. If after 50 miles or so it still has the surge, I suggest taking a look at the Surging Idle Checklist. the original poster was JRichker, and it is listed in the Tech thread index. Jr has done a great job at maintaining that thread and updating it with new solutions.

Happy Stangin'
jason