Question about 2004 Chevrolet TrailBlazer

1 Answer

I have a 2004 chevy trailblazer with 4.3 v6,and it started to run rough like its missing. how do i figure out if its the injectors or the coil pack and wich one

This used to only happen if the ac or defrost was on. I changed spark plugs about 6 months ago!

Posted by Russ Wilkerson on

Ad

1 Answer

Bob Kovalak

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 181 Answers

Sounds like a bad wire, or at best a bad connection. Verify all of the conncetions, at both ends. Make sure you don't take more than one wire off at a time. If you connect the wrong wire to the wrong plug the car will run like a junk heap. A bad coil usually means no spark.

Posted on May 24, 2014

Ad

5 Related Answers

Anonymous

  • 39 Answers

SOURCE: Oil in spark plugs

Could mean a variety of things.....
Possible head gasket leak....(cheap fix if caught early)
Possible Worn piston rings
possible valve guide oil seals

Posted on Jan 12, 2009

Ad

Jonah Oneal

  • 14092 Answers

SOURCE: Running rough check engine light on

cylinder 5 has a dirty or sticking injector. check pvc and egr valve.

Posted on May 10, 2009

Anonymous

  • 819 Answers

SOURCE: I have a 2002 TrailBlazer with the straight

did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
?

Posted on Feb 28, 2010

alicantecoli

Colin Stickland

  • 22485 Answers

SOURCE: 2005 4.4L trailblazer set dtc p0304. What are

P0304....Cylinder 4 Misfire Detected
could be a burnt out valve??

Posted on Aug 17, 2010

Freddy

  • 1311 Answers

SOURCE: 2004 CHEVY TRAILBLAZER 4.2 LTR CHANGED PLUGS, COIL

Throttle body needs to be cleaned.

Posted on Sep 11, 2010

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Replaced 2 coil packs and still running rough 2003 trailblazer


try replacing or cleaning the injectors
when misfiring moves around it is seldom the coils , plugs and any thing else connected to spark but dirty fuel, low fuel pressure and dirty injectors or injector control
use a quality injector cleaner for a few tankfills

Sep 02, 2012 | 2003 Chevrolet TrailBlazer

3 Answers

My 2004 chevy trailblazer is missing badly. Had them read the code for me at auto zone and it said I had a miss fire on the number one cylinder. I changed the plugs and it is still missing badly


Try moving the coil pack from cylinder 1 to another cylinder (swap locations) and see if the same code comes up. If code is different, then coil pack is bad. Other reasons for miss; bad injector, poor compression.
Also, I know you changed plugs already, but always use AC Delco 43-103 plugs on this vehicle.

Sep 11, 2011 | 2004 Chevrolet TrailBlazer

2 Answers

Engine light comes on and engine runs rough.


That's not a question

You have a check light on- got to
get codes set and diagnose that issue

Runs Rough--may be related,still have to
have diagnose and repair

If you do all your own work,
ask a question

Feb 09, 2011 | 2004 Jeep Grand Cherokee

1 Answer

2002 Chevy Trailblazer running rough when idling, especially when its cold. The engine sounds like it is missing. Thought it was because I got some bad gas but still having the problem.I have replaced the...


clogged injectors I bet with the dirty fuel you claimed you had in the tank. Cleaners will not remove all contaminates in injectors for they tend to get seized inside of them

Feb 06, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

Running rough check engine light on


cylinder 5 has a dirty or sticking injector. check pvc and egr valve.

May 10, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

91 LEGACY STARTED RUNNING ROUGH


The cylinders are numbered as on the spark pack you changed. You might have done better putting the seafoam in the tank as an injector cleaner. Not sure why you changed so many parts, you seem to know how to get the codes from test connector lead hookup and the blink pattern. You might also want to check the fuel rail pressure and the crank and cam angle sensors. Before replacing the injector, swap the #4 injector with the adjacent one and see it the code moves with the injector or stays put. If the code stays on #4, then check the injector wiring, if it moves clean or replace the injector.

Mar 16, 2009 | 1991 Subaru Legacy

Not finding what you are looking for?
2004 Chevrolet TrailBlazer Logo

177 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

Marvin
Marvin

Level 3 Expert

85239 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8984 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...