RPM problems when i turn ac on.
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RPM problems when i turn ac on.
OK so heres the problem, when i turn my car on and the air conditioning is off the engine runs fine, but then when i turn the ac on my rpms go from 900 to 500 to 1000 and it just keeps jumping up and down. and also there is a check engine light that is on now and its P0315 which has to do with the crankshaft sensor. i dont know what to do..... please help!
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what size injectors and pulley? Did you go with the oversized tensioner, or gm stage II belt? Did you get a canned tune from them? Did you verify the spark plugs were properly gapped at .035? Also, do you hear any funny noises while it's idling or driving as well?
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#50 injectors and a 3.1 pulley, i went with the oversized tensioner but the bearing was messed up so i sent that one back to zzp and put the stock tensioner back on.. waiting for the new tensioner. i did get the tune from them. and i also did check to make sure that the spark plugs were gapped at .035. and no, there are no funny noises, except when im idling and the ac is on the rpms go crazy.
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that's most likely your issue. That belt is pretty long no matter how tight you get it on there. Even a little slack is gonna throw the timing off. If I were you, I would ditch the over sized tensioner and just get the gm stage ii belt. It's like 40 bucks and you can use it with any pulley available for the m62. I believe at some point, you'll have to end up ditching the over sized tensioner for a certain sized pulley.
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