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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
Clunking noise when coming to a sudden stop
Your transmission has relatively low miles and if used in normal service would not be the first suspect. There are a variety of suspension, as well as brake, drivetrain, and motor mount components, that could account for the noise. As...
Question
My 2009 GMC Sierra is making a clunking noise in the rear end. It happens when the truck is in Drive, but while I am applying the
It is possible that you could have a loose leaf spring shackle causing this noise. If the truck does not have leaf springs on the axle does possible that it has an arm that acts as a control arm that...
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
Tapping and clicking noise
The noise might be caused by a defective blend door actuator. It is a known issue on certain models. If you use a mechanic's stethoscope and probe the actuator, or any "like" components under the dash, you will quickly hone...
Question
Rear shock creaks when turning steering wheel.
If the shock has worn out bushings or the U bracket was overtightened it may be hitting metal to metal and U bracket is rubbing metal of shock. Check bracket and shock bushings.
Question
Creaking and twisting of shock when turning steering wheel
It is possible that the quality of the rubber in the bushings for the shocks could not be as good as what the original shocks had. When bushings rub against the both that secures them to the vehicle this can...
Question
Squeaking coming from rear Drum brakes
The steel backing to which the brake shoe is bonded moves against a steel support plate. That metal to metal contact can cause noise. There are some high temperature, water resistant lubricants that can be applied to mitigate the noise....
Question
So i was driving down the street then all of a sudden my truck dont move anymore on drive or 3rd gear but 1st and 2nd and reverse
The problem is in the transmission forward clutches and seals. The transmission pressures should be checked to see if the shift solenoids are working correctly first. If pressures are all good then you have worn out forward clutches. Have a...
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
I have a 2004 GMC Sierra 1505.3 V-8 what’s a long lasting to Portland for the truck
The spark plugs from the factory are AC R41-985 and can come in Iridium or Platinum tip spark plugs. Both of these plugs are designed to last up to 100,000 miles. There are other spark plug brands and may be...
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
RPM’s fluctuate while idle
Hi Tyler. Thanks for sending in your question tonight. Assuming your AC is turned off, this type of problem can occur due to a few different issues. The most common reason is that the idle control valve is sticking or...
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
I was driving my truck the other day (2000 gmc sierra) and when i would step on the gas the rpms would go up but the truck would b
Check fluid level in transmission. If the fluid level is correct, symptoms of the type that you are describing can be due to anything from a failing torque converter or oil pump, to internal hydraulic leaks, a leaking boost valve,...
Question
Parking assist
As you may know, the parking assist system (also known as URPA - Ultra sonic parking assist) uses small sensors to read objects that are nearby, which transmit these signals to the parking assist module in the vehicle. As these...

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