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Sierra 1500

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Question
1999 gmc pickup, acts like it is not firing on all cylinders randomly
Engine misfires can be caused by many different problems and are generally caused by either a spark or fuel issue or in some cases, a combination of both. Spark related problems generally will result from things like ignition coils, crankshaft...
Question
Fuel Gage
Hi there. This is a problem likely related to your fuel tank sending unit. The fuel tank sending unit is a small float type component (or sensor) inside your fuel tank that measures the level of the fuel inside the...
Question
Automatic Light switch refuses to dim lights although I replaced it with new unit
Ken: If by "dim" you mean "turn off", there is a light sensor in the circuit which, if malfunctioning, would cause the problem you are describing. If the light sensor is not the issue, obviously the circuit is powered when...
Question
Can I put a natural gas motor into a normal truck?
Hi there. CNG powered engines would require multiple system upgrades and changes ranging from the fuel cell, fuel line plumbing and electrical system upgrades. It would probably be more work that beneficial to attempt this type of swap.
Question
Car wont start even with jumper cables
It sounds like your battery is completly dead. This could have happened either because the battery is old and failed or because the alternator is not sufficiently charging the battery. This issue can be resolved in two different ways depending...
Question
Took engine from 4wd 1998 jimmy put in 2wd 05 sierra. Problem is transmission not engaging. What do i need to do?
Make sure the fluid level is OK. Check the shift lever and be sure it is actually moving the manual valve to the commanded position (Drive for example). To determine if the converter is functioning and/or if you have a...
Question
2003 gmc sierra stalling
Hi there. Once running, the engine requires a constant flow of gasoline and good spark to keep that fuel igniting. If gasoline is not readily available, or if there is not enough spark, the engine will quit. More modern vehicles...
Question
Change both motor mounts, I have the parts.
The book time to replace both engine mounts is 8.8 hours. The cost will depend on local labor rate per hour. The left side is 4.5 hours and right side is 6.5 by themselves but 8.8 together.
Question
changed calipers, brakes and my 06 GMC still sticks and ssmells smokey.
Hi Guadalupe: Check the brake caliper torque plate. There are sliding pins in that casting and they must be free. If you replaced the torque plate with the caliper, the pins are probably OK, but if not the pins could...
Question
Carfax shows minor damage no airbag deployed. Is it ok to buy?
Carfax reports unfortunately only reflect any work or damage that was reported to Carfax. I would suggest checking the Kelly Blue Book website with specifics related to your zip code as market prices of cars vary by zip code. This...
Question
Car starts fine every time then instantly begins dying although it tries to keep running and rev back up. Dies in less than 10 sec
There are a number of things that may cause the vehicle to stall while driving. This can happen for any number of reasons such as fuel supply issues such as a bad fuel pump, vacuum leaks, electrical faults or various...
Question
Engine light on with P0171 code
The cause behind diagnostic trouble code P0171 is easiest to find by looking at the secondary firing patterns on the Bank one cylinders. That will confirm if the too lean condition, that has caused the code to set, affects all...
Question
Where is the proportioning valve located
Hi Fernando. The proportioning valve on GMC Sierra's are typically located on the passenger side of the engine bay, near the frame. It is attached from the master cylinder and then runs to each individual caliper. You might want to...
Question
Coolant boils and overheats
At nearly three hundred thousand miles, you might be having engine problems. I know you said the coolant is not milky. but it is not always the case that coolant appears contaminated. It might be a bad head gasket, or...
Question
the reduced engine light and the airbag light is on as well?
Hi Darla. A Reduced Power light usually indicates a fairly serious problem with the throttle system such as a faulty throttle body, control valve, or faulty O2 sensors. When this light illuminates the vehicle will often go into a “safe...
Question
Wheel is free but the key won't turn
You should try a different key if you have a spare one to try. If the spare key turns the ignition now then the original key is worn and needs replaced.If you do not have an extra key then look...
Question
Reduced engine power light
Hi There, The reduced engine power light may come on for many different reasons when the transmission or the engine encounters a serious problem. The reduced engine power mode is a safety feature to ensure that additional damage is not...
Question
I need to now if my 2001 GMC Sierra 1550 4WD had a 3 or 4 spline pitman arm.
Hi there. To see if the pitman arm has 3 or 4 splines, check the splines on it with the nut off. Use a flashlight and look at the splines to see if there are 3 large flat areas or...
Question
My truck has hard start issues in the morning and afternoon. I live in Florida.
There are many causes of hard starting and the reality is all of the causes have to be considered sequentially and patiently. Some illustrative causes include a faulty engine coolant temperature switch (sensor), malfunctioning idle air control (IAC) valve, vacuum...

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