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PO171 and PO174

This is a discussion on PO171 and PO174 within the Computer & Tuning forums, part of the LSx Technical Help Section category; So the other night I got on my car and buzzed it up to 6k and about 5k I got ...

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    Junior Member tording's Avatar
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    99 Camaro

    PO171 and PO174

    So the other night I got on my car and buzzed it up to 6k and about 5k I got some pretty bad pinging and then not long after I got out of the throttle the SES light came on. I pulled the codes and got PO171 and PO174 which makes since since it was pinging pretty bad. I have searched and read that most likely this is related to the MAF. My car does have 125k miles on it and from what i looks like its the original MAF. I have already taken some MAF cleaner and cleaned it but didn't seem to help. Even after I cleaned it the little sensors on the wires are all black and dirty. Now 2 days later I am also getting the SES and PO171/PO174 codes just from driving around town not just when I go WOT. What do you guys think, should I get a new MAF?

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    2004,2008 triumph 675 SE

    If its that dirty still might be a good idea,you might want clean ur O2 sensors,they can cause the same problems,if you have a scanner you can monitior the sensors.

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    Junior Member tording's Avatar
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    Yeah I will be replacing the O2 sensors also within the next week or so when I put my longtubes on. The O2 sensors during WOT though are only for diagnostic purposes and do not provide info that affects the fuel trim so that makes me think it is not the O2 sensors causing this particular problem.

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    Senior Member mrr23's Avatar
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    2000 corvette

    is hte idle a little higher than normal?

    look at the PCV hose that connects the POCV valve to the intake on the passenger side neck. it's about 1" long. it usually burns out on the bottom side of it, thus creating a vacuum leak and leaning out the car.

    other thing is the EGR tube that connects to the intake may have slipped out of place and causing a vacuum leak. pull it and reposition the rubber o-ring and reinstall.

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