need help on a 91 mustang

sidewayzisbest · Post by **sidewayzisbest** » Wed Aug 09, 2006 12:54 pm

I am running 2.25 on MS-1E , and having problems starting it up. It is a N/A motor with heads/cam/and other stuff. At idle its reading 80-90 KPA wouldn't this be too high for idle? What would cause it to be so high?

not sure if i uploaded this log file right though....

RNash · Post by **RNash** » Thu Aug 10, 2006 1:26 pm

What is your MAP source? What does it read with a vacuum gauge? The first thing I would check is if your MAP is reading correctly compaired to engine vacuum. 80 KPA is only aroung 6 inch lbs of vacuum. Is that what you are running?

sidewayzisbest · Post by **sidewayzisbest** » Sun Aug 13, 2006 5:45 am

I am running 2.25 on MS-1E , and having problems starting it up. It is a N/A motor with heads/cam/and other stuff. At idle its reading 80-90 KPA wouldn't this be too high for idle? What would cause it to be so high?
91 gt bennett racing cam, ported tw heads, dss 306 pro lite bottem end and bunch of other bolt ons
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S.Bretz · Post by **S.Bretz** » Sun Aug 13, 2006 3:30 pm

I mean cam will cause a low vacuum at idle....but so will a leak in a vacuum line. First instpect you lines....or get new ones, to insure that you don't have a leak.

Low vacuum is a result of a high duration cam. You can try to bring the vacumm up by leaning it out some and adding spark advance.