PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

O2 issue

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Jan 9, 2016 | 11:41 AM

#1

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From: GA

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O2 issue

Does anyone know of a reason that my O2 sensors are not "cycling" at idle on my SD tune>> :*****:
I have a 98 that has a 02 PCM. at idle (up to around 1400 rpm) the O2s stay in the 900s and the AFR is in the 12s. If I rev it up to around 1400 in gear, the O2s cycle perfectly and the AFR is close (VE needs tweaking)
I purchased new O2s and it didn't help, so the original ones are actually in it right now
I have been fighting this issue for around a month, :crazy: but a crazy work schedule, the holidays and consistent rain every weekend has hampered any testing. I'm ready to get this thing back on the road:yesnod:

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Jan 9, 2016 | 12:21 PM

#2

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From: So.Cal.

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O2 issue

If you're truly in CL you should be seeing negative LTFT's...

Post your tune file.

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Jan 9, 2016 | 01:43 PM

#3

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From: GA

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Thanks JC
Here is the latest tune. I have it set to go into CL at 90*

Attached Files

TC5richtune11.hpt (466.7 KB, 68 views)

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Jan 9, 2016 | 04:50 PM

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From: Warr Acres, OK

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Is it setting O2 codes? Log Fuel System Status.

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Jan 9, 2016 | 05:36 PM

#5

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From: GA

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only codes are 102, 103 from having the MAF out
(I have 101,102,103, 106, "unchecked" and no mil light)

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