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Old 04-26-2008, 06:34 PM   #1
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Default Boots control circuit???? maybe?

just had my car scanned and there was a code 0057 (boost control circuit) in the history...i am having a issue now where the boost will only work if i have my MAF unplugged. if it is plugged in when using boost it will only go up to 2-3psi and it just dumps the boost....any ideas?

i have worked on this be for and replaced my BCS witch made it work. then i was haveing all these issues with me getting a code 35 (MAF) ...if you may already know....i replaced about everything...MAF, ECM, O2, even check voltage and cleaned grounds. well now my MAF issue is fixed...but now no boost what the heck is up with that.do i have to trade one for the other...lol
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Old 04-26-2008, 09:02 PM   #2
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Have a look thru "The Ultimate Guide to Supercharger Upgrades and Repairs" post near the top of this section.
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Old 04-27-2008, 01:28 AM   #3
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i have seen that be for and in this case it is of no use to me at this time...plus it is under construction...lol i think my issue is a little specialized. i dont understand how the MAF is connect to the boost of my supercharger. why would it work one way and not the other...when i first got the car it all worked fine and now i does not...so it is possable
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Old 04-27-2008, 01:50 AM   #4
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just to straiten something out... the only way i could be getting low boost or the boost being dumped is if there was a vacuum leak, or a bad BCA or BCS? nothing else??????!!!!!!!! right?
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Old 04-27-2008, 01:52 AM   #5
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Quote:
Originally Posted by Triple X
just to straiten something out... the only way i could be getting low boost or the boost being dumped is if there was a vacuum leak, or a bad BCA or BCS? nothing else??????!!!!!!!! right?
what if its just a faulty gauge? idk if theres a way to test the map sensor, but they are the info for the gauge, and fairly cheap
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Old 04-27-2008, 11:59 AM   #6
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but still why would it work if the MAF was unplugged????
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Old 04-27-2008, 01:16 PM   #7
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Whoa fellas. Looks like we got some miscommunications here.

MAF = Mass Air Flow sensor. You NEVER want to unplug this...only time this is allowable is at idle to see if the sensor actually is working. If it isn't working, the PCM will default to the values stored inside of it...AND switch to a low-octane table.

MAP = Manifold Absolute Pressure sensor. In SSEi trims, this sensor measures boost and vaccuum, and their sole purpose is to report those numbers to the instrument cluster (unless its a 1996 on up...in that case, there are two sensors...one for the cluster, and one for the PCM).

MAPS go bad, but for the gage operation they could be considered a lifetime sensor. MAPS can also lose their boost/vac signal rubber line. So check ALL your lines, as that particular line ALSO ties into the fuel pressure signal.
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Old 04-27-2008, 07:29 PM   #8
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so why would it still work then?
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Old 04-27-2008, 09:07 PM   #9
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Quote:
Originally Posted by Triple X
so why would it still work then?
well, did you unplug the M*** Air Flow?

Manifold Absolute Pressure sensor?

the maf is on the throttle body, and the MAP, which controls the boost signal is on the rear valve cover, more toward the drivers side.
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Old 04-28-2008, 10:23 AM   #10
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the MAF is what i had unplugged...since i was having so many problems with it...now that its fixed...and plugged in...i do not get full boost if any. but when its unplugged i get full boost
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