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new engine....boosting backfire

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Old 03-28-04, 11:58 AM
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new engine....boosting backfire

right guys,,,,im getting there really slowly,,,engine rebuilt,,,and is now all up and running really nice,,,,
heres the problem...
car will accelerate as long as i dont use boost (by keeping an eye on the gauge and only squeezing the gas pedal lightly),,,,if i try to boost in any way.. the gar as soon as the gauge reaches like 1psi,,,,start to misfire and kangarooo,,,,and sometimes backfires down the exaust,,,
i know from my tiny bit of info there aint much you guys can do,,,,,but just a few ideas,,,,that i can check out will help,,,,
could it be any of the following,,,,AIR LEAK,,ANY OF THE SOLENOIDS POSSIBLY BROKE,,,,something i piped up wrong??
just ideas guys...cheers
Old 03-28-04, 12:07 PM
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Mine did that yesterday and it turned out to be my map sensor vacume line came off.
Old 03-28-04, 12:18 PM
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Any CEL's? Sounds like limp mode...
Old 03-28-04, 12:26 PM
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Plugs or wrong manifold absolute pressure (meaning disconnected map sensor or similar).
Old 03-28-04, 12:26 PM
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rod
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mine kinda did that. it was an vac. line on the air intake.
Old 03-28-04, 12:29 PM
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ok guys,,,,plenty for me to go on,,,,many thanks,,,,ill let you know how i get on,,,,ill check all vac lines,,,,MAP sensor and ECU codes,,cheers
Old 03-28-04, 01:31 PM
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Check the fuel pressure regulator vacuum line.
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