Just hit 100k in my 02 TB: what to look for? performance modifications? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Old 03-13-2019, 07:25 PM
mastahdeano mastahdeano is offline
Junior Member
2002 Chevy TrailBlazer LS
Majestic Red Metallic 4.2L I6 AWD
Join Date: Dec 2013
Location: seattle wa
Posts: 3
Just hit 100k in my 02 TB: what to look for? performance modifications?

I've had my 2002 TrailBlazer for about 6 years, and before that my grandmother purchased it new. I just crossed 100k miles and I'm looking for thoughts on common issues seen around this point. I've already fixed a few things on my own thanks to this forum.

I'm also interested in some (doable in home garage) modifications that would help with gas mileage or performance. I don't tow anything and I'm not looking to race it, I just love this car and I want it to last.

Things I know were done:
Transmission was rebuilt under warranty (<50k miles)

Things I've already done:
Replaced Transfer Case Control Module
Replaced Fan Clutch
Repaired wires to Lift Gate

Also, I live in Seattle and could use left and right fenders (they're dented). I've got that Majestic Red Metallic.
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Old 03-13-2019, 10:29 PM
EnvoyBoy2004's Avatar
EnvoyBoy2004 EnvoyBoy2004 is offline
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2004 GMC Envoy SLT
Graphite Metallic 4.2L I6 4X4
Join Date: Sep 2014
Location: NY
Posts: 1,947
At that mileage you should be replacing the O2 sensors (especially the one on the exhaust manifold), spark plugs (AC Delco 41-103 Iridiums), change differential fluid, change transfer case fluid (GM AutoTrak II).

If the throttle body has not been cleaned in a while, do that along with resetting the PCM (disconnect battery or pull PCM fuses).

I don't think there is much that can be done to improve the gas mileage. If you have access to a scan tool, see what the short term and long term fuel trims are.
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