low vacuum?!?!?!
#1
Staging Lane
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low vacuum?!?!?!
hello, i just installed my cam and i had a timing problem which was fixed when i put in the lt4 km...but for some reason now i am pulling DTC code 33..which is MAP sensor circuit or low vacuum...i am hardly getting any vacuum out of my throttle body...is this normal after installing the gm847 cam or is it because i need a tune?!?!?!?
thank you
thank you
#2
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I'm no cam person, but my understanding is that bigger cams = less vacuum. At least at idle. And who knows, the MAP could've just taken a random crap and needs replacing. Mine gave that code too but it was due to a vacuum leak elsewhere. So you may want to check that.