Question about 2005 Chevrolet TrailBlazer

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Have a 2005 trailblazer,it started acting up by not wanting to run good while taking off or going up hills.put it on code reader it told me that it was cylinder 1 misfire,I changed the plug and the cylinder and it still didnt fix I tried changing the fuel pump and that didnt fix it and the code reader then told me ramdom cylinder we changed all the spark seem to help the problem but now it wont idle it dies everytime you go to drive you have any ideas?

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Could be plugged catalytic converter

Posted on Jul 16, 2009

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Try the catalytic converter. I have the same problem and that's what i'm changing next.

Posted on Jul 04, 2009


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Please help I'm in northern Minnesota driving my 2005 Chevy Trailblazer when all the sudden it won't stop Winding Way up on the RPMs and going slower so I pull over to his stop and now it won't go any...

looks like a sensor has gone or been misread if you stop the engine for awhile like for 20 min and then start up and it runs ok, would think cam sensor has overheated, you will still be able to get home as its in limp mode just means there is no advanced timing this gets turned off. so if it does stay on you will be fine to get home.

Feb 15, 2018 | Cars & Trucks

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Truck drives fine on flat surface but acts like it wants to die out going up hills

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Trying to help out a friend. ... The truck starts, runs, and drives fine until you get to a hill. When going up hill it begins to surge, almost stalling but not quite. ... rubber fuel lines suck shut under a heavy load and act like that. .... tranny fluid level o.k.? ya got me stumped. runs great when it's on a flat surface?

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rough idle, stalling, loss of power. - CarGurus

Dec 14, 2015 | Cars & Trucks

2 Answers


I think anyone wanting to answer your question here is going to need a few more details. What are your symptoms, exact circumstances, environment, etc.? Does the truck stall after starting, is it difficult to start, or does everything seem fine until its running?

Jun 01, 2014 | 2004 Chevrolet TrailBlazer

1 Answer

I know something in my 2004 Chevy Trailblazer is drawing power from my battery when the engine is shut off. I took it to Auto zone for a diagnostic and the was told I had a code he had never seen before...

I say that they are just throwing things that are possible at you to have you replace those items. Here are a few things you can do to check yourself kinda of a round a bout solution. Does the vehicle start hard or normal? If normal then your starter is good. Take a multimeter to your battery, if it is 12.2 or higher then the battery is good, if its lower then the battery is bad. Now start the vehicle, with the vehicle running if you are getting more then 14 volts alternator is good. Another thing you can do, is go to the local auto parts store and put a load on your battery, if the load tester shows good then its good. With my Trailblazer, I had a short in the dash which was causing my battery to die. I have seen a few clients with Trailblazer that the ground wire was causing the issue.

Sep 29, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

Car want pulls hills or any inclines vey well 2005

P0304 code is a cylinder 4 misfire. If the plugs or wires are bad it will cause a decrease in power. I suggest changing the plugs and wires and see if that helps.

Jan 24, 2010 | 2005 Kia Rio

1 Answer

Hello Joe here, My 2005 Trailblazer is acting like it is stuck in 4WD even when it has not been engaged. The newest issue is that the indicator light is changing on its own while going down the road. Then...

wheel bearings will not put the indicator on
look for a bad wire connection or faulty actuator control or actuator
the noise will be the unit trying to engage and slashing teeth

Nov 17, 2017 | 2005 Chevrolet TrailBlazer

3 Answers

I have a 2005 Trailblazer and the check engine light is on, I know the gas cap it tight. Also, I can fill the tank up, but it will say that I am still on empty

You need to find someone who has a code reader or go down and buy you a book such as a haynes repair book on your vehicle which will be around 15 to 20 dollars. Most of the parts stores have them and they are in laymen terms so you can understand them. They will tell you how to retrieve the codes without spending alot of money on a code reader. They will give you suggestions on how to repair the problem based on the codes your vehicle will have on them. That is why your service engine light is on. The computer has detected a problem. Also your sending unit in your tank could be bad and that is why it does not register any fuel.

Jul 28, 2009 | 2005 Chevrolet TrailBlazer

1 Answer

Rough engine on cold start. CEL blinked, now on all the time.

Take it to a different autoparts store and bring pen and paper. Write down codes. You can use search on browser and key in "Mercury code xxx" xxx means whatever number you are told by autoparts. Internet explorer will pull up code. Chances are the second autoparts store may be more knowledgable.

Your cold start circuit is not working and your friend may be right about coolant sensor. Also, the reader Advance used will not reprogram your car. It only reads problem so you have to change physical parts yourself.

Good Luck Joe

Jul 20, 2009 | 2005 Mercury Mountaineer

1 Answer

Check engine light air Fuel mixture

When it comes on again let a regular shop scan it for you with a good scanner so they can see whats going on. a generic code reader wont do it. if it is stored in memory they can still check it. if the truck runs good idles fine just watch out for anything out of the norm , what about air filter and fuel filter have they been changed ? tune up ? air filters should be changed every 2 to 3 oil changes and fuel filter every 30k depending on fuel quality there. and tune up at 60 to 70 k even though they probaly said 100k.

Jun 02, 2009 | 2006 Chevrolet Trailblazer

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