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H2

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...

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...

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...

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...

Hi there. This would be considered an aftermarket upgrade, which unfortunately is not a service our mobile mechanics can offer at this time. We continually add new service offerings frequently, but at this time we would be unable to offer...

Coolant on your vehicle should be added to the reservoir that is located on the passenger side of the engine compartment. It will have a cap on top, that can be removed when the engine is cool, and allow for...

Hi there. There could be an issue with the high beam switch. Check to make sure that the wires are connected correctly to the high beam switch. Also, check the bulb in the high beam on the left side. See...

This engine requires 6 quarts of oil according to the service manual. I would check to see if the engine has an aftermarket engine oil cooler installed. You would see two hoses with an adapter above the oil filter and...

Hello. If you are checking the oil at the dipstick and it is being added to the correct area then you more than likely have a serious internal sludge issue. If there is a lot of sludge then the oil...

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...

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...

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...

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,...

I recommend keeping your transmission in your vehicle that it is designed for. If you plan on putting in a Twin Turbo setup, then the transmission will hold up to the changes. Automatic transmissions are designed to take more abuse...

A large transmission leak like one from a cooler pipe or a leaking transmission pan can cause the transmission to slip if the level gets low enough. Trying to drive the vehicle while the transmission is slipping does not help,...

You may have got contaminated fuel from the gas station. The code P0300 indicates you are getting a random engine misfire (https://www.yourmechanic.com/services/engine-is-misfiring-inspection). This random misfire does not point to any one cylinder misfire and indicates that the fuel may be...

If you are losing that much oil, and there are no external leaks (leaks that are visible outside), your vehicle may be consuming the oil. Unfortunately this can be harder to diagnose than an external leak. The valve guides and...

This is definitely related to a shift linkage which is likely broken or loose. Sometimes the shift linkage bushings wear out and will cause this problem. There is a repair kit out on the market for this that is relatively...