Question about Hummer H3
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Posted on Jan 02, 2017
SOURCE: 1999 vw jetta 2.0
Sounds like two problems. P0300 and P0303 are possibly spark plugs. They could be a coil pack but I'm leaning toward a spark plug problem because of the other two codes - they're indicating O2 sensor problems. If the O2 sensors are screwed up, the car reverts to preprogrammed, rich fuel maps that send excessive fuel through the engine. The reasoning is, if the ECU can't trust the O2 sensors to determine how much fuel to burn optimally, it'll pump a bunch of extra fuel through the engine to keep it safe. Having too little fuel (aka running lean) can destroy an engine, so the ECU plays it safe and runs rich (too much fuel) instead. The consequences of rich running are relatively minor compared to lean running, but can and do tend to create excessive carbon buildup on the catalytic converter and O2 sensors, as well as fouling spark plugs.
First thing to do though is to swap the wires on your coil packs and see if you end up with a misfire code for the same cylinder #3. If you do, then it's the plug or wire. If it moves, it's the coilpack. Replace whichever part is faulty. You'll probably need oxygen sensors too, before you can clear all the codes.
Posted on Sep 02, 2008
have a 1999 3.0td trooper. Diesel fuel in coolant and overheating. Suspected problem with head so replaced with new head and gasket set. Timing appears correct.Fuel appears to be flowing. Engine will not start..turns over..no nasty noises...appears to have compression...any ideas please??
Posted on Sep 10, 2009
The PO442 code is for a "small" leak in the EVAP system. A good starting point is to make sure your gas cap is on tight. When you install it always turn it till you hear and feel the cap click. You should also look at the top of filler neck where the cap tightens down to if its rusted or cracked this will set the code. Check the sealing rig on the gas cap also make sure its not cracked or split. If nothing is obvious there you will want to look at the vacuum lines around the gas tank you will be looking for loose lines or cracks in them. Good luck these leaks are sometimes hard to fine with all the spacial equipment they tell us it takes.
Posted on Aug 30, 2010
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SOURCE: getting a PO422 code on
i think it means that the catalyst converter needs either cleaning or replacing because it's not working properly because it's either blocked up or damaged. not sure which side is bank one though. the check engine light may come on for many reasons. first of all check oil level and condition of oil if it's alright the easiest thing to do is check the book that came with the car and see exactly what reasons the engine light comes on for.
Posted on Mar 14, 2011
SOURCE: I have 6 cyl 03
The catalytic converter is no longer functioning properly
An oxygen sensor is not reading (functioning) properly
There is an exhaust leak
Sometimes simply resetting the code is all you need to do. Many codes will reset themselves over time. What the person meant was that in normal driving the code may reset itself. You don't need to waste your time or fuel driving nowhere to attempt to reset the code.
Personally, here is what I would do if I were you. If the place in Texas where you are moving to does not require emissions testing, do nothing for now. If the car seems to be running normally the code may reset itself. If Texas requires emissions testing you will need to have the problem addressed or the car will not pass emissions. Bring the car to a reputable independent mechanic for repairs. If it is your catylitic converter expect some sticker shock as these can be expensive. Hope this helps, Please rate this!!! :) James Booth
Posted on May 23, 2011
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