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Old 05-04-2008, 10:44 AM
glc4122 glc4122 is offline
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97 gp codes

yes, i own a 97 pontiac gp 3.8 engine. the check engine light has been coming with codes #171, 336, 402 what is the problem. all help would be appreciated. some times the tachometer will quit working while driving, once i stop and turn of engine it will work again.

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Old 05-04-2008, 11:16 AM
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BNaylor BNaylor is offline
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Re: 97 gp codes

The DTC of concern and probably causing the tach issue is the P0336 which is a crank position sensor range/performance issue. Not sure but it may cause the other DTCs to set so get that taken care of first as far as priority.

P0171 is a lean condition and a fuel trim DTC and P0402 is an EGR related fault. Flow too excessive.



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Old 05-04-2008, 11:55 AM
glc4122 glc4122 is offline
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Re: 97 gp codes

thanks for the help, so take care of the crankshaft postion sensor, is it hard to install and if so would you have and diagrams of the location.

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Old 05-04-2008, 12:11 PM
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Re: 97 gp codes

You're welcome.

We have a DIY procedure posted at our Tips & Maintenance forum. See link below.

Click here

Also, be sure to clear the DTCs after CKPS replacement and then see if the DTCs reoccur. Good luck.



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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8
'02 Oldsmobile Alero GL2 - LA1 3400 V6
'99 Buick Regal LS - L36 Series II 3800 V6
'03 Honda CR250R MX - 2 Stroke 250cc
'97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold)
Timeslip 08/12/06

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Old 05-04-2008, 07:11 PM
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Re: 97 gp codes

Funny a Bad CKPS would set a DTC isnt it? I've never had that happen on a 3800 before.
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Old 05-24-2008, 01:24 PM
glc4122 glc4122 is offline
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Re: 97 gp codes

yes, i tried to replace the cps and been having troubles with the removal. the nut on the end of the pulley,will nut turn, the whole pulley turns,is there a trick in loosening it. i don't have a impact?
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