2003 Chevy Trailblazer No Engine Power

I have a 2003 Chevy Trailblazer with 146,00 miles on it, the problem is lack of engine power, I put the scanner and it showed up this code P0172, I did fuel injection service, replaced fuel filter, also changed spark plugs & cleaned up the throttle body. any ideas?

ProTech:
How about the air filter? Have you checked that?

Yes i changed it as well.

Well that code means that the fuel trim is rich, which means you’re either getting too much fuel or too little air. You seem to have changed most of the usual components. If the air filter is clean/new and the intake system has no blockages or restrictions, I would assume a fuel problem.

Have you checked the fuel pressure regulator for leaks?

No yet, i am about to check that tomorrow.

Ok, check that out, remove the vacuum line from the top of the regulator after you’ve warmed the vehicle up for a while. You may want to let it sit for 10 minutes or so after you remove the vacuum line. If you see or smell fuel coming out of the top, replace the fuel pressure regulator.One more thing, if the fuel press. regulator checks OK, you are probably looking at a fuel injector problem. One or more injectors are spraying more fuel than normal. If you have a scanner, you can usually tell which cylinder by watching the fuel trim or look for any misfires. Check O2 function as well. One last thing, contaminated fuel can cause odd problems like your having too, so you may want to take a fuel sample.

Thank you for your time.

You’re welcome, glad to help!


2003 Chevy Trailblazer

Why would my music and battery light stay on after key is taken out. Like there is still power there.

What kind of vehicle do you have? Make? Model? Year?

Your Trailblazer has what’s called ‘Retained Accessory Power’. That will keep power to the radio and some accessories after you shut the vehicle off and/or remove the key. When you open the driver’s door, the power goes off.

I’ve heard ground wire problems to a fuse.

If it is acting up, and not believed to be the normal operating circumstances, you could very well have a wiring problem. Something like that really needs to be checked out by a technician in person.


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