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L5-3.7L

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Question
Car suddenly went into limp mode
Hello and thank you for contacting Your Mechanic. Your Hummer could have the brake system engaged for the traction control. Disable the traction control and see if the engine will increase in speed. Another thing to check is the...
Question
Fault ABS fault traction
I would suggest first checking the ABS sensors at the wheels as they are known for being very sensitive and relaying false readings. Things as simple as dirt and debris can cause these to not work properly. Since these are...
Question
How much is it to replace the rear main seal on a 2007 Hummer H3
Hello. It is common for the rear main seal to leak on this engine. Over time the seal fails and this occurs. You will need to take this to a shop that can remove the transmission to change the seal...
Question
My car is overheating when the air conditioning is on - 2007 Hummer H3
Hello. Running the A/C will put extra strain on the engine and cause it to heat up quicker. If your vehicle is overheating, you should keep it below 280 degrees at all cost. This is the temperature when extreme irreversible...
Question
My service light says service temp. What do I need to look for?
Hi there. A low coolant level can illuminate the service light and create the heating and AC problem you have described. Check the coolant level while the engine is cold and top it off as necessary. Also, look around the...
Question
Why does an Hummer H3 oil change cost more? 2003 Hummer H3
Hello - the H3 has a 6-quart oil change capacity, which is more than most engines these days (4 or 5 qts), and synthetic oil is recommended. These are the only 2 logical reasons for increased oil change cost. Hope...
Question
Hello 2006 model Hummer car's fuel consumption too high
Hello: In most cases, the OBD-II error code you wrote down in your question is related to a faulty crankshaft position sensor. When this component is damaged, it can impact the ignition timing of the engine, causing increased fuel consumption,...
Question
I need a thermostat replaced do I need to replace the water pump as well
Typically, the scenario is the reverse: that is the water pump fails and the question is should the thermostat be replaced at the same time that the water pump is replaced. The answer is absolutely because the thermostat itself can...
Question
Need to know where the ground wires for the motor to frame are located.
Hi there. Check the back of the engine around the cylinder head. The wire will either be a silver color wire and also black in color. The wire will connect to the frame or the body with an alternate ground...
Question
Q: I replaced the Vent Valve Solenoid and Purge Valve and the check engine light came back on again for P0449 like before the repair.
It is very possible that you can have a clog in your EVAP system somewhere preventing flow. I would recommend having the lines cleared out with some compressed air if possible by a qualified professional.
Question
I have hummer h3 that needs a raditor i have the raditor need to know your labor fee and do have to buy antifreeze and.i have spar
To obtain the requested quote, please visit YourMechanic’s radiator replacement service page. Once on that page, click on "Get a Quote" and enter your vehicle information (year, make, model). You are welcome to buy your own parts and book a...
Question
Possibly replacing brake light switch for 07 GMC Canyon.
The brake light switch is located on the bracket to the brake pedal. There are two screws that secure the switch to the bracket and a harness plug. All you need to do is remove and replace the switch and...
Question
Rejects the nozzle when filling gas
Hello, It sounds like you may have an issue with your evaporative emissions control system. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors...
Question
Engine whining
The typical cause of a whining sound during engine idle; which progressively gets louder during increase in RPM is a belt, pulley or faulty pump (either AC, water pump or power steering). If you didn't remove the AC belt, this...
Question
Diagnostic scanner is reading low fuel rail pressure system
There are a few things that may cause this to happen, such as a clogged fuel filter, a failing fuel pump, a restricted fuel line or in some cases, a faulty fuel pressure sensor. I would suggest having a professional...
Question
08 chevy colorado 3.7 5 cyl should i be concerned that my alternator {2 months old} doesnt put out power for 2 min when cold start
Hi there. At first glance, I would not assume that the voltage issues you are experiencing is related to a faulty alternator itself. It's more likely that you have a faulty electrical connection or harness that is causing the inconsistent...
Question
P0420 motor mounts on a Hummer H3?
Hi Jimmy. Thanks for contacting us today. I'm in agreement with you - in that the replacement of engine mounts is NOT a solution to resolve a P-0420 Error Code. You should read this article about this code - to...
Question
Threw a rod in my 09 H3 3.7 can just the bad rod be replaced from the bottom side and what should it cost to have that done denver
The connecting rods can only be replaced by removing the piston from the engine. Pistons can only be removed from the top, ad that means the cylinder head has to removed from the engine. To access the rods on this...
Question
H3 hummer, loss of power when acceleration, traction comes on , replaced throttle body, MAF, pedal assembly codes po223,p2135,p21
Hi Justin. Thanks for contacting us today. Assuming you reprogrammed the throttle body to the ECU after replacing it, there are a few things that could be the source of your issues that the OBD-II trouble codes might help locate....
Question
Q: I replaced the Vent Valve Solenoid and Purge Valve and the check engine light came back on again for P0449 like before the repair.
Hi Warren. Thanks for contacting us tonight. The first question I would ask is if you removed the code from the ECU after completing the repairs. When a code is activated, it needs to be removed by a mechanic with...

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