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L6-4.2L

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Question
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
Jerking during deceleration.
Check all of the driveshafts in the jeep and see if any universal joints are worn causing the shafts to move around when letting off the throttle. The universal joints in the front axles are the most common joint to...
Question
Car turns on like normal but won't move forward or in reverse.
Hello, the automatic transmission has three systems; electronic, hydraulic, and mechanical. You should check your fluid level as well as condition of the fluid. What you describe could be an internal mechanical failure with transmission. The electrical system which...
Question
Will low differential fluid in my buick rainier cause jerking when turning vehicle?
Hello, thank you for writing in. The rear differential will make the vehicle skip or turn roughly when backing up or in a forward gear. It will feel as if the 4 wheel drive is active, and cause issues with...
Question
I changed the battery and now my windows go up and down by themselves and I have a clicking noise from the door
Hello, thank you for writing in. When these types of electrical issue occur after changing the battery, there may be several things you have to try to rectify the issue. One would be making sure the battery is hooked up...
Question
Se enciende reduced engine power en ese momento no hace ningún cambio la caja de transmisión y el motor no pierde aceleración
Hi there. A Reduced Power light usually indicates a fairly serious problem with the throttle system. When this light illuminates the vehicle will often go into a “safe mode”, which will severely limit the speed of the car and in...
Question
I have a 2005 trailblazer
Your vehicle can use up to 15% ethanol with no ill effects and such use (of E-15 for example) does NOT require regular use of any particular fuel system "cleaner". Most gasoline vended these days already contains a sufficient additive...
Question
my vehicle is making a loud squealing noise, I think it is the power steering pump. it has been leaking fluid for awhile
Hello, thank you for writing in. The power steering pump is a very common place for the system to leak fluid. The pump can mechanically fail, it can crack, and more commonly the gaskets and seal fail. With that being...
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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