p0171 p0174 on an 04 gxp - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-08-2011, 10:48 PM   #11
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FIlter'* in the gas tank. The Northstar engine'* haven't had a PVC valve since 2001 I believe. Just an orifice under a cam cover that doesn't require maintenance .
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Old 05-09-2011, 01:53 AM   #12
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the filter is in the tank? must be a bitch to change i guess?
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Old 05-09-2011, 07:48 AM   #13
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if you got a inspection cover shouldnt be too bad
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Old 05-09-2011, 08:20 AM   #14
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[QUOTE=GXP Venom;1524581] I suggest pulling to positive wire for a couple seconds[QUOTE]


I presume you mean removing the positive cable from the battery under the rear seat.

Don't mind doing this if it might help.What would this accomplish other than maybe scrambling the memories in all the on-board computers and making them start from scratch again.?
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Old 05-09-2011, 12:45 PM   #15
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Thats what it does. Not scramble, just resets all (except possibly some codes that faulted enough times to need it cleared by machine)The car has a relearn procedure thats uses what it current learns vs using history. And this goes for engine operation and tranny. So cleaning the past up could help all. I do it after long trips to to get highway mileage\operation info out. It seems me to help WOT'* and crisper shifting.

As mentioned earlier, Not something to do with the engine running......
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