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98' 240sx, Cam position sensor? Cylinder not firing!
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invain
New User
Jan 2, 2009, 10:41 AM
Post #1 of 1
(1746 views)
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98' 240sx, Cam position sensor? Cylinder not firing!
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Been having a problem with a cylinder not firing in my 98' Nissan 240sx. First thing I checked was spark, which was all good. I know compression is fine in that cylinder, and the plug was dry when I pulled it so I know fuel is the problem. Checked/swapped injectors and found that wasn't the problem. I found very low voltage at the injector plug so we ripped into the harness and found a small short in the 12v wire to the injector. Fixed that and now the voltage is fine. However, the injector is still not receiving a ground signal from the ecu. We tested continuity in the ground wire all the way to the ecu harness connector and it was fine. I have a second ecu for the car so we swapped that in which changed nothing as well, so I've ruled out an ecu problem for now.
The only thing left I can think of is the Cam position sensor not working correctly. We tested contiunity in all the wiring for the sensor following the fsm instructions and found on problems. Now I need to know if there's any way to check if the cmps (cas) is actually sending the correct signals or not.
Could a faulty cam position sensor cause only one cylinder to misfire/not fire? I really have no clue what else the problem could be. This problem has been real intermittent which made me think it was originally a wiring problem, but we've tested pretty much every connection possible and they're all fine.
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