Can a faulty crank position sensor cause the system to be too rich? P0172
705

Asked by Majura Feb 15, 2017 at 11:30 PM about the 2002 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

I have been getting this code very often in the last three days. I had fixed all obvious  elements that can cause the system too rich problem but I still get the CEL with the same code. By elimination, I rule out the following elements:

Oxygen sensors,  MAPS, IAT, CTS, Fuel Pressure regulator, Air cleaner, fuel pump, injectors and spark plugs.

At this time, my prime suspect is the CPS because there was some oli leak in the valve cover, which may have damaged the CPS. But can this CPS really be responsible for the system too rich?

4 Answers
705

Majura answered 7 years ago

Jim- Thanks for your response. I think the 2002 Jeep Grand Cherokee Laredo 4.7 L has no MAF. Am I wrong? If I am wrong, can you give me a hint on where to look for it?

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705

Majura answered 7 years ago

Over the last two days, I have noted that the System too Rich errors come ON and then go OFF by themselves when I drive over a considerably long distance. What is the matter?

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705

Majura answered 7 years ago

I still need help on this question please! One critical sensor that I have never changed is the crank position senors and probably the idle air control valve. All other sensors are brand new (some areaftermarket and some are OEM).

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705

Majura answered 7 years ago

Got no help here, however I researched further and the first prime suspect at this time seems to be the carbon build up on the valves and on the cylinders, It is associated with cold start misfires, which happens very often with my vehicle. I will try to decarbonize my engine to see its effects, so stay tuned to get my results of my experiments cum trials

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