Question about 2003 Chevrolet TrailBlazer
Trail blazer 2003 4.2 code p0301
Cylinder #1 misfire. If the engine is running fine the code will reset on it's own after 40 cycles of the ignition key. If the engine is running poorly it could be due to bad spark plug or coil pack.
Posted on Jan 14, 2013
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Posted on Jan 02, 2017
Posted on Mar 10, 2009
I had the same problem with my 2003 Trailblazer EXT. It was a leak in the "evap" system at the gas tank. They did a smoke test to locate it and found that one of the three or four little devices on the top of the tank was leaking. Could not just repair/replace the part or gasket, but no... had to replace the whole fuel tank. $900.00 later. What ever happend to good ol sealant???
Posted on Feb 27, 2010
P0172 System too Rich (Bank 1) check the MAF sensor , check for vacuum leaks , you can clean the MAF sensor with electronics cleaner,, be sure and dry it off when your done, also check the fuel lines for cracks, or pinched lines, check the fuel pressure at the fuel rail, add some fuel injection cleaner to the fuel tank, you may have a clogged fuel injector,, and check for any exhaust leaks before the O2 sensor on the bank one side of your motor .
As far as your fans not working, check the fuses and switches in that circuit for shorts or bad switches
Posted on Sep 26, 2011
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