Question about 1991 GMC Sierra
FYI it's kinda confusing when you list two different model years for your vehicle. In this case, it shouldn't make any difference. Code 15 is a low coolant temp fault code, possibly caused by a thermostat sticking open or a faulty coolant temp sensor. However, without knowing what engine is in the vehicle or whether it's fuel injected or carbed, it's hard to say what code 32 is pointing to. Depending on the missing info, it could be pointing to a fault in either the BARO sensor, EGR system, or MAP sensor. I suggest checking all vacuum lines first, as a broken or loose vacuum line could cause a fault in any of those circuits.
Posted on Jul 14, 2013
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Posted on Jan 02, 2017
I have found that when you are going to engauge 4x4 high, it is best to only be going about 3 miles an hour. Not faster, not stopped. It likes some movement to help it mesh. I've had perfect shifts since I started this. Hope it helps. Wade.
Posted on Jan 27, 2009
the encoder motor sensor is inside the encoder motor. the encoder is located at the transfer case. Remove the encoder and by part number 88962315 this is the sensor. you will have to retime the motor after
hope this helps
Posted on May 06, 2009
SOURCE: trouble code
DTC P0420 Catalyst System Low Efficiency Bank 1
You will find a bad O2 Sensor behind the converter or a bad catalytic converter on the bank 1 side of the exhaust manifold. This is the one on the drivers side.
Posted on Jul 28, 2009
if you put your vehicle information in at advanceautoparts.comyou can search sway bar and find parts that you need - there was someinfo missing on which sierra model you have as far as engine size andvin # match but I came to: http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/partlist_Sway-Bar-Link-Kit_78_R|GRPCHASAMS__sway%20bar___
Posted on Sep 17, 2009
Take the front axle actuator out of the axle. Plug it back in and have some one push the 4x4 button. The actuator should move, it's a liniar motor. If it doesn't then the actuator is bad or there is a wiring problem. If it does there is a problem in your front diff or some where else in the system.
I'd take a guess and say it's the front actuator.
Posted on Oct 11, 2009
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