Post by
FlyingCrowbar »
https://forums.nicoclub.com/flyingcrowbar-u287313.html
Mon Dec 31, 2018 4:56 pm
Greetings, Pathfinder/QX4 forum --
First time poster here.
I have a 2002 Pathfinder that cranks but won't turn over. A week prior to this problem, the vehicle started idling between 1500 and 1750rpms, and the Service Engine light illuminated and I got a P0507 code. That is the only code my reader finds.
The hoses look to be in good shape. I cleaned the throttle body and the MAF sensor. When I crank the Pathfinder, the battery and starter are strong, and I can hear the fuel pump priming, so I don't think it's a fuel pump issue. Moreover, when I crank the engine, wisps of exhaust come out of the tailpipe, so I think the vehicle is getting a spark.
I thought about trying to run the relearn procedure to clear the P0507 code, but the engine has to be at operating temperature for it to work, which won't happen since I can't get the engine running.
By process of elimination, I don't think it's a spark plug issue. Had that been the problem, the vehicle would have run rough before failing to start. The vehicle has 1/2 tank of gas, and seemed to be running fine just before it died, so I don't think it's bad fuel. A clogged fuel filter would cause it to starve, not idle high. One thought is that the ignition problem is related to a failed crankshaft position sensor. (How would I test the CPS to determine whether it's failed or not?)
Any other thoughts on what the problem is? Could I have two separate problems that arose almost simultaneously?