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Sonoma

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Question
Key stuck in ignition
Hello there, a key getting stuck in your ignition is a common fault with your 2002 GMC Sonoma. The most common cause would be a worn key, faulty key cylinder, ignition switch, steering wheel lock, or a wiring harness fault....
Question
Truck jerks and hesitates on acceleration
This may be a sign of a failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected into the...
Question
My truck struggles to start and stay running
This sounds like a fuel pump that is weak to start the vehicle and then stops pumping after ten minutes when it heats up. Have the fuel pressure checked to see if it is holding pressure and keeps pressure when...
Question
Plugged heater core
Hey there. The heater core may burst if you use too much pressure to try and purge the core of blockage. The core gets blocked from using the wrong fluid in the vehicle. The coolant will get all brown and...
Question
Suspension is "loose"
The term "suspension is loose" is most likely the mechanics way of saying that you have worn components in the front end that would cause the alignment to not be able to be set to specifications. He might of seen...
Question
My coolant ran out when the vehicle sat for 2 years and I am scared to start it.
Hi there. Look in the engine compartment and locate the item that cracked to cause the coolant to leak out. If the radiator cracked, then replace the radiator, fill up the cooling system with water, and look for leaks. If...
Question
What else can be done
You should have an engine compression test done to see if one or more cylinders are low on compression. If the spark plug insert is not installed correctly or leaking compression it will be identified in this test. If the...
Question
The steering shaft (I believe it's the intermediate shaft) disengaged from the steering column.
Freely turning the steering wheel past the normal extent (travel limits), while the shaft is disconnected from the splined yoke will damage the "clock spring" in the steering column that the air bag relies on to fire. That assembly should...
Question
Truck spun and hit the curb, now the rear wheel wobbles
Hey there. You will need to have the rear rim inspected along with the rear axle to see if one or both are bent. I have also seen where the rear axle housing gets bent if the curb was hit...
Question
Check engine light / truck stalled on me today and wouldnt start
As you may know the oxygen sensors which are part of your emissions system read exhaust gases to determine whether or not the appropriate amount of oxygen is present in the exhaust. Based upon this reading, this information is relayed...
Question
High rpms and no acceleration
This may be a result of low transmission fluid or potentially a faulty transmission control module. A faulty transmission control module may cause a delay in acceleration or erratic shifting of gears. The transmission control module has various sensors such...
Question
Cylinder 1 misfire
Hi there. From the description you have provided, two things come to mind. One, a blown head gasket between cylinders #1 and #3. Two, an intake valve not sealing ie; broken valve spring, burnt valve. Providing spark to the number...
Question
My Brake pedal makes a humming when pressed
The brake caliper(s) could be failing to retract, thus setting up a harmonic during or after application of the brakes. Calipers should be rebuilt (or replaced) every 75,000 miles or so due to the harsh operating conditions they endure, principally...
Question
1994 GMC Sonoma not getting power to fuel pump
The problem is somewhere in the fuel pump relay control circuit. There are five relay terminals: battery power, ignition power (controlled by the ECM), ground, output to the pump and connection to the fuel pump prime connector. What the prime...
Question
My truck is jerking
Hi There, What you are describing sounds like a dirty or faulty mass air flow sensor. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays...
Question
fuel tank filler neck broken
The filler neck is readily available. For example, if you input your year, make and model and search on "fuel filler neck" at Car-Part.com you will find an exact match for your truck with available vendors and prices. New ones...
Question
Car will hesitate going up hills. Speed will decrease, but going straight it will do fine. I wanna fix this asap.
Hi there. Most of the time, acceleration problems like this are caused by fuel system component failures like the mass air flow sensor, dirty fuel injectors, loose vacuum line or other ignition system problems. If you want to have this...
Question
I have an engine knock and my oil pressure guage is reading high, then stops shortly after starting to drive.
Hello, You may want to inspect your oil pump to see if it may not be causing the problem. If it is not pumping or circulating oil properly, it may also cause this type of increase in oil pressure that...
Question
99 GMC Sonoma carbeurated or fuel injected
Hi There, The 1999 GMC Sonoma 4.3L V6 motor is a fuel injected motor that came with what is called a Central Sequential Fuel Injection (CSFI) system. In this application, there is one main fuel injector (called a MAXI injector)...
Question
Does a 99 GMC Sonoma have an electric fuel pump or a mechanical
Hello, The 1999 GMC Sonoma should have an electrical fuel pump. You should be able to hear the fuel pump come on when you turn the key to the "on" position during it's priming phase prior to starting the engine....

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