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TrailBlazer 2002-2009
The TrailBlazer, originally introduced as an upscale Blazer, was produced from 2002 to 2008 with a powerful I6 engine and with a monster V8 offered in the Trailblazer SS
Platform: GMT 305, 360, & 370.

PLUGS & wholesale opportunity


Old March 7th, 2018, 10:44 AM
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Default Plugs @ 100k

Hi all, how do we feel about replacing plugs on the base V6 4.2 engine? ('06 LS 95.5K miles) Really necessary at 100k just on principle, or no? Vehicle definitely doesn't have a perfect/strong start, kind of a weak rumble after ignition and a slight rough idle. RPM's are good during idle though. Was going to use Bosch 2x Platinums, should I stick with Delco's when it comes to plugs? (the Bosch's are pre gapped)
Also, I have the opportunity to buy parts, mostly Delco/near OEM, super discounted, what should I grab?
O2 sensors, T-stat, throttle body parts, H2O pump parts? Was wondering if any of these are known issues/ recommended at 100K? (Aside from what any maintenance manual may say) I'm a firm believer in not tinkering with engines and if it ain't broke, don't fix it, but believe in preventative maintenance as well. THANKS ALL! Grateful for any input!

Last edited by Rocks76; March 12th, 2018 at 9:12 AM.
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Old March 12th, 2018, 8:04 PM
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Use Ac/Delco irridium, 41103 plugs. People have reported issues with other makers plugs .
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Old March 13th, 2018, 12:37 AM
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appreciate the input and confirmation. I've seen the accounts of having problems with other than Delco. Should just always go with instinct
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Old March 13th, 2018, 7:56 AM
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If you can get Delco parts at super discounted parts, then don't hesitate and go for it! I used to have a V6 4.3. I changed the plugs at a little over 100,000 miles and the old ones looked almost as good as the new ones.
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