2003 chevy trailblazer 4.2 NEED HELP

Asked by Aharri270 Aug 17, 2022 at 01:42 AM about the 2003 Chevrolet Trailblazer LS RWD

Question type: Maintenance & Repair

I have a 2003 trailblazer 4.2 inland v6 so i bought
the truck and it wasnt running so i put a new
battery on to figure it out. It starts great idles great
go to take off it only runs 15 to 20 and 1 to 2 rpms.
Ive changed the air temp sensor cleaned the trottle
body with the sensor inside it. I even got another
one no change so i changed the map sensor, the
variable timing soleind and plug nothing. So ive
checked the air filter its good the oil is hood added
treatment, new gas with treatment. If i resest the
ecu  it gets up in 2nd gear and about 30 mph. Also
the oil gague either starts at 80 when starting and
push the pedal but dives to 40. So i changed the
acceleration position sensor the pedal and the fuel
pump is getting fuel to tthe motor bc it always
starts and nevers just dies. Anyone got anymore i
ideas

2 Answers
307,265

Gene answered about a year ago

Exhaust back pressure too high, fuel pump pressure too low, weak compression. What does live data show?

Mark helpful
38,945

beatupchevy answered about a year ago

Some vehicles are particular about fuel pressure just having it won't do you could have bought a fuel pump gauge with the money you spent on parts you didn't need , Catalytic may be plugged see if there's a healthy blast of exhaust , You may have put new gas in it but you probably didn't purge the lines , The oil pressure sounds normal; . scan for codes even if the light ain't on

Mark helpful

Your Answer:

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