Coil on plug question... - Page 2 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Engine Tunes/Mods

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Old 02-20-2019, 09:53 PM
vansmack vansmack is offline
Junior Member
2002 Chevy TrailBlazer LS
Summit White 4.2L I6 2WD
Join Date: Sep 2010
Location: Yucaipa, CA
Posts: 16
Well that is better, because it sounded like that was for the diagnostics. I know some shops do charge a lot just to tell you what they think is wrong.
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Old 02-21-2019, 11:15 AM
TB-Al's Avatar
TB-Al TB-Al is offline
New Member
2007 Chevy TrailBlazer LS
Graystone Metallic 4.2L I6 2WD
Join Date: Nov 2017
Location: Pleasure Island, Al.
Posts: 338
I agree on dealerships being outrageous on diagnostics. My local dealer charges $95 and almost always just goes by the codes that were thrown. $95 for 2 minutes is robbery. When I go there because I just don't want the hassle of doing the work (I just let them replace a water pump in 4 hours) I go in wearing the hat I got from a used car dealer and tell them what I want. They are very pleasant and seem to know I won't fall for the framus oil needing flushing. Then I go sit in the waiting area and listen to the old ladies telling me how framus oil should need flushing every 6 months on a vehicle this expensive.

This dealer didn't change my plugs so they always recommend it for $225 so it sounds like your diagnostics were expensive. I ALWAYS read the codes (Walmart has a $20 reader that reads most) before going to a dealer even when I know exactly what the problem is.
"It is useless to do with more what can be done with less." William of Occam
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Old 02-23-2019, 05:54 AM
05Base 05Base is offline
Junior Member
2005 Chevy TrailBlazer LS
Steel Gray Metallic 4.2L I6 4X4
Join Date: Feb 2015
Location: MN
Posts: 15
I've had 1 failed coil #3 and when they fail they can foul your spark plug, you want all plugs to have the same resistance so they should all be replaced after a coil fails imo. I've replaced my plugs way more than necessary so I would say the coils are not sensitive.
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