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PostPosted: Sun Feb 24, 2019 2:51 pm 
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Year and Trim: 2002 Bonneville SSEi
This is a revist of the issue with the my girlfriend's car. Finally got my scan tool to link (plug is worn on vehicle) and got "P0102 MAF circuit low" and "P0171 Fuel trim lean bank 1".
My guess is one is causing the other (bad MAF causing lean condition)? Have no idea if the O2 sensor (s) has been changed.


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PostPosted: Wed Feb 27, 2019 3:59 pm 
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Posts like a Northstar
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Joined: Sun Aug 22, 2010 11:11 pm
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Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
Start by unplugging the Maf
and see if it improves

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2000 SSEi
past rides:
1996 SSEi
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1987 Grand Am


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PostPosted: Thu Feb 28, 2019 11:08 am 
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Year and Trim: 2002 Bonneville SSEi
Ok. Will do. It's weird that it will run fine on one start cycle, and then will run like crap the next.
I'm thing it might be something as simple as a fuel filter. It also tends to do it more on a light fuel load (3/8 thank or less). Runs better with 1/2 to 3/4 tank and premium helps (I'm guessing because of the lean condition).


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PostPosted: Fri May 17, 2019 10:12 pm 
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Year and Trim: 2002 Bonneville SSEi
FIXED!
Unplugged the MAF as suggested and the sputtering and stalling stopped. Idle was a little rough.
Avoided the $20 eBay sensors and got a Hitachi MAF from Amazon for $72 ($150 in AutoZone). Took me five minutes to change it. Car runs so smooth now you can't tell it's running.


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PostPosted: Sun May 19, 2019 9:45 am 
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Joined: Sun Aug 22, 2010 11:11 pm
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Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
good stuff!!.....just to be sure, see if the codes are gone and not a pending code......just to be sure.

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poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am


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PostPosted: Sun May 19, 2019 11:17 am 
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Year and Trim: 2002 Bonneville SSEi
I'll have to hook up my scan tool. The CEL was on from the bad sensor and was obviously still on from the unplugged sensor.
The fuel mileage was down to about 9.8 MPG (city) plugged in or unplugged.
The CEL went out within a few miles before I got a chance to reset it. Fuel economy has nearly DOUBLED to 17 MPG city driving.


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