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Low power issue on 2003 GM 3100

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4 years 2 months ago #37892 by Bonham
Low power issue on 2003 GM 3100 was created by Bonham
Hi all, low power on 2003 GM 3100. WOT test yesterday short term fuel and long term fuel readings on my scanner said 0%. What is that telling me?
When in driveway short term ranges from 0 to -4.7 and long term is -19.5
MAP is 37
MAF 3.78
Any thoughts on direction?
PS trying not to be a parts changer anymore.
Thx
Mike

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4 years 2 months ago - 4 years 2 months ago #37921 by Chad
Replied by Chad on topic Low power issue on 2003 GM 3100
My first thought is a leaky fuel pressure regulator. What is your upstream O2 Sensor doing? Can you force it LEAN, by creating a vacuum leak?

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)
Last edit: 4 years 2 months ago by Chad.

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4 years 2 months ago #37925 by Tutti57
Replied by Tutti57 on topic Re:Low power issue on 2003 GM 3100
With the wot test, you would want to look at the front o2 data instead of the fuel trims because the car goes into open loop then. No trimming happening in open loop but the o2 will still report what it sees.

Follow Chad's advice to make sure that o2 is reporting properly.

Nissan Technician

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