Wife's Trailblazer!
Senior User
Joined: Jul 2006
Posts: 209
Likes: 0
From: Deep South Louisiana
Don't go and buy anything yet! Cylinder #3 is famous for missfiring!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
When it rains or you wash your car water is channeled to the center of the weatherstripping and straight on top of cylinder #3. My wife drives one and this has been a problem for us more than once. GM does have a replacement weatherstripping but at MY cost! F%$&k that it should be a recall for emissions related problem.
But at any rate, take the coil out and blow out the hole with air. Clean the coil and put it back together, everything should be fine!
When it rains or you wash your car water is channeled to the center of the weatherstripping and straight on top of cylinder #3. My wife drives one and this has been a problem for us more than once. GM does have a replacement weatherstripping but at MY cost! F%$&k that it should be a recall for emissions related problem.
But at any rate, take the coil out and blow out the hole with air. Clean the coil and put it back together, everything should be fine!
Post Fiend
Joined: Oct 2003
Posts: 9,176
Likes: 4
From: Western Central NV
If you can't figure it out there is a good Trailblazer Forum called trailvoy.com There are some good guys over there. We owned an 04 TB 4x4 drove it to 75,000 miles before selling it. We bought a used 1997 Blazer 4x4 & I like the Blazer better. Not to ARGUE but the 4L60s are not JUNK trannys. I burned one so bad that the fluid was coming out the vent tube & drove it another 100 miles pulling a 5000# trailer. I had it flushed, new filter, & pan gasket, added some LubeGard & the tranny is running great 4000 miles later. Try that with an Explorer. The Trailblazer is a nice truck but there are too many things that are too costly to fix on them. Fan Clutch is $450 because it is operated by the computer. But most new trucks are too costly too fix. I guess that is why I drive older used stuff.
Posting Guru
Joined: Oct 2006
Posts: 1,083
Likes: 0
Question re Trailblazer
[quote=Moore558;6359557]I've done my fair share of work on trailblazers at work. The 4.2L motor uses coil on plug that is similar to the COP on a ford mod motor. The coils are kinda buried under the upper intake tube and silencer assembly. There are 2 10mm bolts that you have to remove that are on the right side of the box (standing in front of the truck looking at the engine). Take those two off and the intake hose off and it will lift up. There you will see the coil packs which are held in by one 10mm bolt each. Remove the connector and lift the entire coil out.
What is the trick to getting those connectors of the coil? is it held with a clip?
What is the trick to getting those connectors of the coil? is it held with a clip?
Thread Starter
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New User
Joined: Jul 2006
Posts: 13
Likes: 0
The connector to the coil has a small clip under the "dome" at the bottom of the connector. Just pry a little and wiggle off.
OK I looked at the coils on #3 and #4 cylinders. They looked clean. I also replaced those two spark plugs. #3 spark plug did look more worn than the #4 plug. Truck seems like it runs a little better but I am thinking that a new ignition coil would be in order.
OK I looked at the coils on #3 and #4 cylinders. They looked clean. I also replaced those two spark plugs. #3 spark plug did look more worn than the #4 plug. Truck seems like it runs a little better but I am thinking that a new ignition coil would be in order.
Elder User
Joined: May 2007
Posts: 544
Likes: 1
The connector to the coil has a small clip under the "dome" at the bottom of the connector. Just pry a little and wiggle off.
OK I looked at the coils on #3 and #4 cylinders. They looked clean. I also replaced those two spark plugs. #3 spark plug did look more worn than the #4 plug. Truck seems like it runs a little better but I am thinking that a new ignition coil would be in order.
OK I looked at the coils on #3 and #4 cylinders. They looked clean. I also replaced those two spark plugs. #3 spark plug did look more worn than the #4 plug. Truck seems like it runs a little better but I am thinking that a new ignition coil would be in order.
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Post Fiend
Joined: Oct 2003
Posts: 9,176
Likes: 4
From: Western Central NV
It doesn't take much to smash up the TB. I tore off the front & rear plastic just 4 wheeling. One thing I like about the BLAZER better ground clearance & not all that plastic crap to tear off.
Posting Guru
Joined: Jan 2001
Posts: 2,358
Likes: 3
From: Nebraska
Wow, seems like everyone here thinks Trailblazers are junk! I work at a small shop that does everything and lots of times we get a Blazer (pre-Trailblazer) or S10 pickup in every day. Those IMO are the absolute worst vehicles GM has recently made. We've got a few customers with TB's that seem to be MUCH better vehicles and I haven't had to do anything major to one yet. My parents have an 03 with 80k. Other than a tie rod end and a recall or non-working brake lights, it's had no problems. I'd say they're a major improvement over what they replaced.
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tseekins
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Feb 3, 2011 06:43 PM
