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Hummer

A few different components could be causing your issue. Your symptoms sound at first like a spark issue. If a plug was tightened down too hard, the gap can become smaller than intended. This would decrease the power of the...

Thanks for writing in about your Hummer H2. Let's cover the basics of diagnosing a overheating issue. First, verify the actual temperature at the thermostat housing. Cooling system (and cap) has probably been pressure tested by now. If it tends...

Hello. MAP stands for manifold absolute pressure. So the answer to your question would be that it is the manifold absolute pressure sensor that there is something wrong with. The map sensor reads the pressure in the manifold and sends...

If you have excessive sludge (https://www.yourmechanic.com/services/engine-oil-is-black-and-gritty-inspection) in the engine, then the oil that you pour into the engine may not be able to drain down into the oil pan. You should change the oil and filter (https://www.yourmechanic.com/services/change-oil-and-filter) using 6 quarts...

Hello. There is a computer that controls the door locks and the warning light that you see. It is known as the Body Control Module. Something has likely gone wrong with this module, which may or may not be repairable....

Hey there. This may be caused by a few different things which all seem to indicate you have a fuel supply problem. This may be caused by low fuel pressure, dirty or faulty fuel injectors (bus not starting), low voltage...

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...

Hi there. Thanks for contacting us today. If you shifted into reverse while the vehicle was in forwarding motion, it's likely that shift linkage or the reverse gear itself has been damaged. Honestly, without completing an inspection (https://www.yourmechanic.com/services/car-is-hard-to-shift-inspection), it's hard...

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 (https://www.yourmechanic.com/article/p0420-obd-ii-trouble-code-catalyst-system-efficiency-below-threshold-bank-1-by-jamahl-walker) -...

Hi Antonio. If you're looking for information about installing or replacing a PCV valve on your 2006 Hummer, please click this link (https://www.yourmechanic.com/services/pcv-valve-hose-replacement). Gracias.

If I was diagnosing your Hummer, I would want to know if there were any diagnostic trouble codes (DTCs) stored in any of the computer modules. I would see if the Check Engine light was on and use my scan...

Oil in your coolant is a bad sign. This usually indicates a leaking head gasket or cracked head. A cooling system pressure test and block test will be able to determine this. I suggest having a qualified technician, such as...

Hello. It sounds like there is something broken in the engine internally. A push rod could be bent, a lifter could be stuck, or the engine bearing could be messed up. Have your vehicle's noise inspected (https://www.yourmechanic.com/services/car-is-making-a-noise-inspection) by a certified...

If the engine has a coolant leak that is not external to the engine or cooling system would not have anything to do with the transmission repairs. You need to have the engine head gaskets and intake manifold checked for...

Hi there: Based on your question and the information listed, it's possible that you've got an exposed wire somewhere in your vehicle that is causing a short with your door locking mechanism. Sometimes this issue is caused by a faulty...

Either your battery is due for replacement (https://www.yourmechanic.com/services/battery-replacement) or you have a parasitic draw somewhere. A draw can be found by placing an ammeter in series with the negative battery cable. If excessive current draw is found, the cause of...

The best way to determine if this would make your vehicle street legal would be to call your local non-emergency police number and ask them if that would be legal for your vehicle. You could also call or visit the...

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....

It has to first be determined if the actual engine temperature is really fluctuating or instead the stalling is just simply a coincidence with a gauge malfunction. A scan tool can measure engine operating temperature. Fuel supply faults are a...

Oil pressure can be tested and verified against factory specifications using an external pressure gauge, connected to a threaded access port on the engine block. If pressure measures normal, and the engine otherwise functions normally (adequate and even cylinder compression,...