Question about 1997 Pontiac Grand Prix

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I have a 1997 Pontiac gtp with a code P0171. The light on the dash sometimes is on and sometimes it goes off on its own but more often is on.

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  • Pontiac Master
  • 757 Answers

That means that cylinder number 1 is running too lean.

There are number of causes of this that need be checked out one at a time. Allowing a lean condition can very easily damage your motor, most likely a burned valve first.

First and foremost...never run regular fuel in your GTP. 91 octane minimum. Going lower won't necessarily cause the condition it's in now but it does pre-detonate, causing damage and robbing horsepower.

Anyways...disconnect your MAP sensor. Then drive the car it for a few on/off cycles, to operating temperature and if the code is cleared immediately before driving and doesn't return then you likely need a new MAP sensor.

Second...if disconnecting the MAP sensor does not clear the code, consider the gasoline brand and it's age. Having water in it can cause the lean condition. In this case I recommend an additive for your GTP fuel...first, add the highest octane at the pump that you can then add a can of some stuff called B-12 by Chemtool.

Also inspect the connectors and wiring harness to your MAP and oxygen sensors.

After you have located and solved the culprit, change your spark plugs. I recommend copper core Autolite 605 gapped to .055-.057 for a factory stock GTP.

Posted on Jul 12, 2010

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Posted on Jan 02, 2017

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