Posted by jimg.allentown on January 03, 2017 at 18:40:45 from (108.36.80.118):
In Reply to: OT-diagnostic codes posted by tomturkey on January 02, 2017 at 16:39:50:
The most efficient way to tackle this is to start out by clearing the codes. Then, you address the first code that reoccurs. As another poster stated, P0171 and P0174 are mixture codes. That are telling you that the mixture is too lean. When I see both of these codes together, I suspect that there is nothing wrong with the O2 sensors. There are MANY things that can cause lean codes. As already stated, fuel pressure is a possibility. A mass air flow sensor out of calibration is also a possible suspect. Next in line is possible air leakage in the intake stream. Last but not least is it might need a valve job. I know that sounds far-fetched, BUT... on many of the V-6 engines of that era, they have soft valve seats. After a lot of miles, the valves beat their way into the head. This is a difficult problem to diagnose. I went through this on my own car. After exhausting all other possibilities, I pulled the heads. Found that the exhaust valves were beat about an eighth of an inch into the head on one bank and the head was cracked in between the intake and exhaust valves as well. A valve job cured the problem.
Keep in mind that there are some things like the crankshaft position sensor that will stop the engine. It simply will not run with a bad crank sensor. EGR codes are not critical, but will light up the check engine light. In any case, you need to start out by clearing all of the codes and see what comes back.
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