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Sonoma

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Question
Bank one and two in rich conditions, CEL on
If the mass air flow sensor has failed, unfortunately cleaning will not resolve the issue. I would recommend having your mass air flow sensor tested with a digital multimeter or scan tool using the manufacturer's suggested procedure to determine if...
Question
switching into 4hi from 2hi by itself
Your vehicle uses an electric transfer case motor to switch from 2WD to 4WD, and that motor or the associated wiring may be failing and switching itself over bumps. I would begin by checking the wiring and connectors to the...
Question
What sensor affects bank 2?
Code PO302 refers to a misfire. P1153 refers to the O2 sensor not switching often enough. This sensor monitors how often a lean to rich condition or rich to lean condition is present. When there is inconsistency in this, the...
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
Can you help me figure out why my ABS and brake lights come on at the same time?
Hi, thanks for writing in. In order to know what is causing the lights to come on, you would need to have the ABS module scanned to see what codes are stored. You could be low on brake fluid or...
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
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
Q: High rpms and no acceleration
What you are describing may be a result of a faulty speed sensor, potentially low transmission fluid or a even a faulty transmission control solenoid. As your vehicle travels down the road, the computer analyzes data being sent by vehicle...
Question
Q: 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
Q: 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
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
1992 GMC somoma 4.3 keeps burning fuel pumps as soon as they are put in
Fuel pumps rely on fuel for cooling and lubrication so be sure the tank is always kept at least one-quarter full of fuel. If there is a voltage drop on the supply circuit to the pump, that will cause high...
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
if I loosen the coupling that connecting the inner tie-rod and the outer tie-rod to the pitman arm while the steering wheel is los
Hi Derek. Thanks for contacting us today. Any time you remove or loosen suspension components, you risk having the suspension fall out of alignment. However, you should be ok, if you completed this step to align your steering wheel and...

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