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L6-4.2L

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If you replace both engine and transmission and still have reduced engine power, what do you do
The first thing to do is to have the computer system scanned and codes logged. Then clear the codes and road test to see if problem and check engine light returns. If it does then retest the system for codes...
Question
Cooling fans
Hi There, The fan running slow may suggest you have a faulty coolant fan relay or a bad cooling fan resistor, which controls the speed of the fan. Either of these two components may cause the cooling fans to come...
Question
Do you need to reprogram after replacing throttle body on 04 trailblazer
The Service Manual does not "require" any specific intervention (re-learn procedure). On this vehicle, the PCM will, by default, update itself to new values, just as you idle and drive the vehicle, if such new values are required. Even if...
Question
Nothing blows out of vents
Hi there. The truth is that it could be one or several of the items you listed that is causing this problem. An electrical relay will supply power from the AC/Heater switch to the blower motor, so if it's damaged,...
Question
Reduced engine power on GMC Envoy 2003
The issue you are writing in about is common enough that a specific diagnostic, namely a Reduced Engine Power Warning Light Diagnostic is performed by technicians dispatched by YourMechanic. If you request that diagnostic, the responding certified mechanic will get...
Question
What would cause my 02 trailblazer to sometimes not accelerate when pushing on the gas pedal while driving?
If your RPMs are going up when you press the accelerator pedal but the vehicle does not move, this would be the transmission slipping. Transmissions can slip due to low fluid levels, poor fluid condition, or internal damage to the...
Question
Transmission
It is possible that the shift cable that goes from your shifter handle to the transmission itself has broken. This would cause the transmission to be perminantly stuck in park and would likely be a simple and inexpensive fix. I...
Question
I took my 04 GMC Envoy to better brakes for less as I needed to have it pass smog and the check engine light was on. They said I n
Inasmuch as YourMechanic is mobile, you need not bring the car anywhere as the certified mechanic will come to you and take care of the radiator replacement. If you desire mobile replacement, please simply use YourMechanic's radiator replacement service page....
Question
How much do you charge for a water pump and clutch fan
Hello, thank you for writing in. The water pump is a very common place to develop leaks. Leaks in that area are a good indication. You can check the hoses and their connections to make sure they are secure and...
Question
How much for a clutch fan and water pump replacement
Hi there. Our professional mechanics are mobile, meaning they come to your location to complete the repair or maintenance services you require. To receive a price quote for these two services, click the blue links and then click the Get...
Question
Code P0171
Hi there. The P0171 OBD-II trouble code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine. A lean condition occurs when the engine...
Question
The ac sometimes work and sometimes not
One possibility can be a loose connection or electrical short somewhere in the heating and a/c system. A loose/poor connection at the control unit or one of the a/c system pressure switches can be at fault. Intermittent connection can cause...
Question
On highway,didn't know 4 hi was stuck on, weird smell, looked like gear oil or oil was leaking pretty good, seemed to stop in 2wd
Hello, thank you for writing in. Your vehicle is typically rear wheel drive, when you have it in 4-Hi then you are telling the front wheels to engage with the transmission. The fluid is then pressurized and the gears mesh...
Question
I started my car and turn on AC but it would not start.
It will take a bit of deeper diagnosis to tell what is going on with the vehicle as it seems you have multiple concerns going on. An air conditioning system with a low refrigerant charge may not turn on because...
Question
Oil pressure gauge drops, idle goes crazy and wanting to die.
Hi there. Either the engine oil pump is plugged up or failing or the engine bearings are worn causing internal oil leakage. The engine is running rough and wanting to stall due to the lack of lubrication. I recommend seeking...
Question
I have issues with my air suspension. I have been reading through the forum of the topic, and I believe it has to do with my compressor.
The pump will become loud when it is under pressure and lifting a load. If the pump is quiet and you hear a hissing sound around where the pump is, either the pump is leaking or the main supply hose...
Question
I have a Po171 code on a 2006 trailblazer
The cause behind diagnostic trouble code P0171 is easiest to find by looking at the secondary firing patterns on the Bank one cylinders. That will confirm if the too lean condition, that has caused the code to set, affects all...
Question
Can you bypass the AC compressor? 2004 Chevrolet Trailblazer
Hello - if the AC compressor clutch and bearing are still OK, you can simply unplug the wire to the compressor clutch, and the clutch pulley bearing will continue to turn with the belt, and no other action is necessary....
Question
estimate to install new radiator hoses top bottom an septine belt 05 trail blazer
Hi there. In order to provide you with a quote, you need to first equest a price quote for radiator replacement on this page for your Trailblazer. Once we receive your info, we can put together a more detailed estimate...

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