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Old 07-10-2007, 07:34 PM   #1
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Default Running too rich

I have a 2003 Bonneville SE and it is running really rich. See mod list below. It doesn't seem to matter if I have my ZZP pcm in or my stocker, I pretty much get the same results. I put my stocker in Sunday and it seemed to get better for a while and slowly started to get rich again. Anyone have any ideas?

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Shaun
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Old 07-10-2007, 07:49 PM   #2
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What are your symptoms?
(Or, by what method are you measuring A/F and/or trims?)
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Old 07-10-2007, 08:55 PM   #3
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Very rich gas smell, bogging and loading up when on the gas hard, poor gas mileage. Using DHP powertuner scantool and fuel trims are way rich. -25 sometimes when idling and -15 to -7 while driving.
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Old 07-11-2007, 04:02 AM   #4
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Can you verify with the PowrTuner that your MAF sensor is working properly?
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Old 07-11-2007, 10:46 AM   #5
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Also check your O2 readings from the sensor.

A bad sensor will default you into a rich mode.
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Old 07-11-2007, 08:38 PM   #6
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If it was a bad O2 sensor or MAF sensor, I would get an SES light and a code wouldn't I?
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Old 07-11-2007, 09:18 PM   #7
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One or the other could be working poorly, but not "broken" enough to set a light.

Log a scan, making sure to capture A/F, ECT, FT Cell, Gear, IAT, IPW, KR, LTFT, MAF Hz, MAP kPa, MPH, O2, RPM, Spark, STFT, and TP%

EDIT: capture IAC, also...a malfunctioning idle air controller can cause chronic richness
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Old 07-12-2007, 08:31 PM   #8
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The powertuner I am using is set up for a 1998 grand prix and won't read my pcm. I am able to use the scantool but I have very limited features to view. I have LTFT, STFT, MPH, FT CELL, AND IPW and that'* about it. I will see if I can post the scan for you.
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