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Old 01-09-2014   #1
Ichevyracer
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Default Another Trailblazer problem

My wife has a 2005 Trailblazer LS (I6 engine). Currently has 155,000+ miles on it. Finally got enough time to change the spark plugs less than 10,000 miles ago (back in Nov). Monday while driving she said it lost power and wouldn't get out of it's own way when she went to pass another car. The check engine light came on and code read for a misfire (P0300). The engine gets a misfire when you give it a lot of gas. The SUV hasn't really been driven since Monday. However in the mornings I have to play musical car to get both vehicles (my car and backup truck) out the garage. I noticed in the mornings the Trailblazer the Trailblazer has a lot of white smoke when started. It looks like some connected a fog machine to a hose. I know it's due to the cold but when you know something might be wrong you notice every little possible issue. Just figured someone might have some thoughts to checks.

Cliff notes:
2005 I6 Trailblazer has a misfire
Looses power under heavy throttle
Excessive white exhaust smoke (probably due to cold)
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Last edited by Ichevyracer; 02-06-2014 at 09:16 PM. Reason: Rich being Rich
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Old 02-04-2014   #2
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Have you cleaned your throttle body?
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Old 02-05-2014   #3
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If the oil isn't like a chocolate milkshake, probably not a head gasket. With the moisture we've been having lately, I would swap coil packs around and see if the problem follows. If you clean the throttle body, don't forget to do the relearn procedure.
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Old 02-05-2014   #4
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I didn't know Trailblazers had V6's?
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Old 02-05-2014   #5
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It's an I6
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Old 02-05-2014   #6
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Quote:
Originally Posted by novajoe View Post
It's an I6
I know, I was being an ass.
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Old 02-06-2014   #7
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Quote:
Originally Posted by Red2001SS View Post
I didn't know Trailblazers had V6's?

Quote:
Originally Posted by novajoe View Post
It's an I6
You just wouldn't be you Rich if you weren't being an ass.
I had forgotten to update this tread. It was a faulty spark plug. I finally got the truck to give a specific cylinder. It was coming from cylinder 3 (P303). First I swapped the coil pack with cylinder 2. Drove around and still had a P303. Swapped plugs and then the misfire moved to cylinder 2 (P302). I went ahead and replaced all of the spark plugs with AC Delco double platinum 41-835. So far no issues.
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Old 02-08-2014   #8
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good to hear it was a simple problem
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Old 02-08-2014   #9
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Thanks it just sucked that it went bad. I had just replaced them with the AC Delco iridium. Oh well hopefully these continue to work.
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