How much should a tune up cost for 2003 chevy trailblazer ext lt

2003 if car has TBW, TAC, if the scan show sTAC failures
the PCM goes to special limphome mode. FOR THROTTLE error
s
I guess car has no tachometer? to see the transmission fails to upshift, 4 times at least. 1,2,3,4 ,RPM drops from 2 to 4.
all A/T DO THAT, ,NOT CVT . (Some CVT even have steps to make owners happy, but are useless. in fact,

only clue is screaming, well that is stuck in 1st gear and is tranny limphome( it has its very own limphome mode too)
check all fuses. and scan the OBD2 scan port, next, or go broke guessing endlessly or even putting wrong parts in to car or done wrong..
you can not fix modern cars lacking a scan tool, no way.
talking drive train or ABS. etc.
almost 20 years old and has lots of problems ignored,
which one to fix first is a hard choice that many.

Questionable Rebuild

Remove the Valve Body & Clean

I think the reason no one has answered your request is because the process is extremely hard and difficult to explain on a site like this. This type of repair is not recommended for an inexperienced person, especially because of the overhead cam timing mechanism.

Unless you are familiar with working on overhead cam engines, this is not a DIY project. To get to the point of accessing the head gasket requires quite a bit of disassembly. Then you need to deal with the cam timing during reassembly.

I am not aware of an emissions diagram, but you might find what you need at www.compnine.com. There exploded diagrams of various sections of the Trailblazer as well as parts lists.

Piece of cake. Remove the air cleaner top and air cleaner. Walla, there's tons of room to change the bulb now.

my 2003 Chevy Trailblazer EXT lt ac works/ but the fan won't go from low to any other setting? any ideas

The park shift lock needs adjustment. The solenoid that locks irt inplace maybe the cause of this

Took my Trailblazer to dealership. They replaced both rear tail light socket boards (these are plastic parts that house all of the rear lamps/bulbs and attach to tail light housing) They advised the sockets in the boards have a tendency to go bad. Everything works just fine. Cost of each part was approximately $29.00. Easy to replace yourself and save the labor.