Search Results for ‘4.2l’

2007 4.2L Trailblazer | Was driving down the road and the engine light started flashing. Pulled over and it died, I started it back up and it ran like it had a misfire really bad. Compression checked all cylinders and cylinder 2 had 0 PSI. Piston still moves and is fine. Could it be a broken...

Hey folks! Thanks in advance for your input. I've poured through just about every thread I can find on this subject but I had some specific questions I wanted to see if anyone could help out with. I just was given a 2008 Trailblazer with 91K miles with a dreaded knock that just started on the...

About a month ago we got a check engine light and very rough idle. The code indicated misfire on cylinder 4. I replaced the spark plugs and cleaned the throttle body, but that didn't help at all. I then replaced coil pack # 4 and it worked fine. I cleared the code and it didn't come back. A few...

I can't really seem to get a fix on why a 2005 Alternator can't be fit on a 2006 Trailblazer 4.2L LS. Is it the amps? The bracket? The connector? 2006 Trailblazer is out on an Island as the 2007-09 also do not retro. I want to fit one of those HO Alts but most only go to 2005.

I am stuck with the stock exhaust right now and am looking towards getting an aftermarket muffler such as a flowmaster or borla. I am a teenager and do not get paid much so i cant afford a full exhaust. I do not mind sound, in fact id like to have it fairly loud just not too loud to where I have...

Hi all ~ I did the unthinkable ... while changing the plugs on the 4.2L engine on my 06 Envoy, the #2 plug broke in half with the threads remaining in the engine. I'm not a mechanic by trade so changing oil and plugs are the only thing that I would even attempt on my own. This is the first time...

Hey i have a 2004 TB LT, with a CAI and Performance chip. What other mods can i do to make some more HP? Have yet to see someone turbo the blazer, so what other mods is there?

Hey my fellow trailblazers I need help big time. My trailblazer, an '06 4.2 lt, is acting up, and I have no idea what the problem is. When I start driving highway speed, my whole car starts to shake inside and out, and i feel the brake pulsate when I press on them, also does this when i reverse...

As this forum gave me so much in learning about my vehicle, I thought I'd go ahead and give something back, and document my new found knowledge and show you the steps on how to change your 4.2L I-6 Spark Plugs. Note: Common sense would dictate that you go ahead and do a throttle body cleaning...

I have a 2004 Trailblazer 4.2L I6 and was wondering if anyone had a tuner or know where I can get the truck tuned. I have been having problems with my O2 sensor throwing a code. I have 110000 miles on the truck and recently put a new catalytic converter and o2 sensor in the truck. Everything was...