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Old 09-19-2013, 07:52 PM   #1
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Default 97 bonneville electrical issues

hey there, just looking for some help !have a 97 bonneville se with 86,000 on it !

recently the car cuts off on me, not all the time, happnd about 5 times ! no warning or anything ! but it always starts right back up ! dont know whats wrong ! no noises or anything, just like cars shuts off ! fuel system is good, no hesitation, no stumbling ! has never not started !! had subwoofers in car, which is why i think my battery gauge was all over the place... checkd the alt and batt and autozone guy said batt is only charged 10 perecent and alt is bad going from 14.2 to 2.0 and just bouncing around ! so i unhooked beats and battery stopped bouncing, seems to still move a little when at stop, or a idle ! check batt and alt again and alt is completley fine, and so is battery, so idk what is wrong! taking outthe beats helped, but car still cuts off !

also when i start car, it starts rough, runs high, engine revs itself up to about 3, scares me...after its done reving battery gauge goes to normal and cars runs smooth and quiet ! maybe it a cold start but idk ! think its the mass air flow sensor or the map sensor!

check engine light on for only
p0104, which is man.absolute pressure or mass air flow sensor
and a evap code, forgt number but it starts with defective gas cap or crack hoses

checked all vacum lines, seem to be fine

question are !

1. is my alt or batt bad? even if the reading are now fine, but still a little movement in batt gauge!

2. anyone have a clue to why it revs itself and calms down after a second or 2? i think it related to the battery prob because like i said while starting and its reving up and i can watch rps go up by theirself, batt gauge is almost in the red, then once kicks down batt gauge goes normal !

3.why is it cutting off? cant be alt or batt! think a sensor maf or map! which 1 should be done first!

other things ive heard !

throttlebody?plates need to be cleaned

any info would help !

car runs good, just had oil changed, fuel system flush! i think theirs an electrical issue but not sure ! radio turns on and rests by itsself! no dimming lights tho or flickering !
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Old 09-20-2013, 08:54 AM   #2
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you check the boot that comes out of the throttle body toward the front for the evap and fpr? all it has to be is a little cracked looking and it wont hold air. sounds like the alt and or battery is bad because when you put a load on it it cant handle it. and for the quitting i would try disconnecting the maf when its acting up if the car runs there is a problem with the maf
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