Search Results for ‘misfire’

I decided to check my spark plugs which looked alright so i place them back, 2 days later i come to a stop my car starts vibrating, i get the code P0300 so i replace all spark plugs with news ones i go for a test drive i still have the same shaking and vibration i try changing all ignition...

Hey, folks! New poster here. Went to get my vehicle inspected and was told that my braking power wasn't within tolerance, which isn't necessarily true IMO (successfully stopped in 25ft at 20mph once I left - checked with a tape measure and everything), but nonetheless I'm forced to address some...

Hello everyone. I have been having issues with my 2008 GMC Envoy SLE w/ 4.2L Vortec / Approx. 200,000 miles. Mechanically speaking, I am a lame man, but I've compiled a write up on the issues and what has been done or considered to fix the problem. All respectful input is welcomed and...

I drive a 2003 Trailblazer LT. I love the truck, it's a heck of a machine but it is falling apart on me. About three days ago when I started my TB the fan sounded really loud. When I put it in gear and accelerated the fan was speeding up and getting louder. Not gonna lie it sounds pretty cool...

My ‘02 envoy has a misfire I have change the spark plugs and set gap to .41 ~42 and coil packs the cylinder is getting spark I even took the spark plug out put another in take the ignition coil out set a ground wire to the spark plug and put the plug on the ignition coil out side of the cylinder...

Hey Guys, I’m in desperate need of your advice and guidance. I have 03 Trailblazer 4.2 with 90,000km (56K miles) on it, purchased back in May 2020 in Dubai. I love the car and it was always running fine. No noise, idling at 600 rpm when sitting behind a light and 1900 rpm on highways at 100...

2003 Trailblazer lt 4.2, cylinder 3 started misfiring a couple weeks ago and I determined the ignition coil for that cylinder went bad by first unplugging #3 coil and noting there was no difference in how rough the engine was running then unplugging #2 to note how much rougher it ran with two...

So my 05 Trailblazer began running rough a couple days ago.It was slightly choppy sounding with a misfire also.I bought a scanner and pulled codes earlier tonight.Two map sensor codes were present,but Im almost 100% sure they're from 3 months ago when I had Autozone pull codes which lead me too...

I have a 2004 envoy with the 4.2 I replaced the plugs and coil packs 6 months ago and it has run perfect. I went to start it up las week and it ran like crap. I put my code reader on it and got codes for the cam position sensor and the vvt actuator solenoid. I replaced both. Now I onlt get the...

Hello everyone, I'm new here, but I've used this site to troubleshoot a bunch of problems on my Trailblazer. I have a 05 Trailblazer LT The truck has about 160K and the engine has about 95K. I keep getting a misfire on the second cylinder and can't get rid of the code. The truck will run...

so im working on an 03 tb with the 4.2, and this thing has got me stumped. very rough idle, stalls, no power, will not accelerate at all. pulled codes, got p1345 along with a random and a cyl3 misfire. changed plugs, pulled out acdelcos, unknown if they were original or not, but #3 was...

Greetings, my '04 TB started running rough while just driving down the highway. The SES light is blinking under acceleration but steady when going down hill. Have had three coils fail on this truck in the past three years or so, each time producing the same symptoms. So off I go to AutoZone to...

Greetings, my '04 TB started running rough while just driving down the highway. The SES light is blinking under acceleration but steady when going down hill. Have had three coils fail on this truck in the past three years or so, each time producing the same symptoms. So off I go to AutoZone to...

Hi everyone, Before I get to my problem here is a little background info on the vehicle. It is a 2006 Trailblazer 4.2 LT2 with 200,000 miles. I have owned the vehicle for 9 years and up until recently I have never had a problem. I stayed up to date on all regular and recommended maintenance. No...

Hey Everyone, I'm new here and have an issue I'd like to get some better insight on. I have a 2004 Envoy, I6 with a continuing misfire P0300 issue. 150,000+ miles. Several weeks ago, the engine started to misfire (blinking check engine light, running terribly). I put in AC Delco plugs about...

Hi everybody, I need some help asap. My battery went out last January in a remote place and I had Walmart replace it. The genius over-tightened the positive terminal and it loosened over time(stripped threads) allowing corrosion to set in. A couple days ago, the terminal finally went...

I have been sitting on this problem for a while now and reading horror stories about the lifter/AFM/replacement engine costs so I finally decided to start investigating the problem to see what I could find. My engine is only misfiring on cylinder 4 so I have changed the plug (have the others to...

I changed my plugs a short while ago due to a very bad misfire on cylinder #6. the new AC Delco plugs fixed the rough idle and misfire....for about 3 weeks. I was sitting in a drive-thru when the miss returned. now after another 3 weeks today it finally set a CE light, I pulled the code when I...

I have a 2002 trailblazer with 138000 miles. Been having the infamous misfire issues for a couple months now. Did all the usual suggestions, cleaned throttle body, changed plugs, replaced 1 coil pack, cleaned camshaft position sensor, changed oil, seafoamed, put in fuel injector cleaner, using...

I recently purchased a 2002 trailblazer, vortec 4.2L I6 LS 2WD. I have noticed that when you are sitting at a stop, and then quickly switch back to gas and begin to accelerate it seems to lose power for a second and then take off. this was the first issue I found until I was driving in town...