Question about 2003 Chevrolet TrailBlazer
The check gauges light alerts you to the fact that one of the gauges is reading out of the normal zone. From what you have said I assume there is a problem with the oil pressure gauge in that it indicates the oil pressure is low. I suggest you remove the oil pressure sending unit and hook up a test gauge, see what the oil pressure really is. I suspect you just have a defective oil pressure sending unit.
Posted on Nov 07, 2012
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Posted on Jan 02, 2017
These particular Vortec engines need more fuel pressure to start than run. So being able start it by pouring fuel and being able to drive suggests a pump starting to go bad (loosing pressure), a cloogged filter (causing a restriction), or a fuel pressure regulator going out (letting off too much pressure).
Posted on Jul 06, 2008
PO172 means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). I would replace the thermostat first. The computer could be injecting too much fuel because it thinks it never gets to operating temperature. That may keep the light off.
Posted on Jan 28, 2009
under the vehicle you will see a plastic cover under the engine, remove the 4 13 mm bolts and drop the cover (they give you an access port but its cleaner and easier to just take the cover off) the bolt to drain the oil is also a 13mm on the bottom of the oil pan facing the ground. drain the oil, put the drain plug bolt back in and tighten, don't over tighten! the filter is located up the front of the oil pan on the passenger side, only accessible from the bottom, remove the filter let the oil drain, put some fresh oil on the rubber seal of the new filter and install, make sure to follow the directions on the filter because it will tell you how many turns to put on the filter, overtightening will make it extremely difficult to take off next time! after that, clean up any oil left on the frame and oil pan and install the plastic cover with the 4 13 mm bolts, locate the oil fill cap, remove and refill the engine with the right oil (i believe its 5w30) untill it reads full on the dipstick, put the cap back on and start the engine and let it run for about 10 seconds, shut the engine off and recheck the oil level and fill as necessary. (if you have the 4.2 i think it takes 7 quarts, check your owners manual for the oil type and capacity to be sure) remember to turn the key on with the engine off and pump the gas pedal 3 times to reset the oil life indicator after the oil change is done, hope this helps!
Posted on Jun 29, 2009
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