2000 Dodge Durango 4.7 no fire

[a_kelley]

I've got into a 2000 Dodge Durango w/ 4.7L, distributorless ignition. New cam sensor, new crank sensor.. throwing "Camshaft Position Sensor Malfunction".. won't start, good fuel pressure, unsure how to check for spark but seems like its getting fuel but not hitting a lick. fuses good, ASD relay good, no burnt up wiring.. ideas? been there before? computer replace/reprogram?

 

[DemonDave]

If it's still throwing a cam sensor code after replacement you likely have a wiring malfunction or a bad pcm, though there are other possibilities, the sensor could be seated improperly, (seen it once or twice) a bad new sensor (seen it a few times), or there is the chance that the crank key has sheared off of the timing chain sprocket, throws the cams out of time and causes the same problem. I'm sure there are other possible problems, but these I have seen on a 4.7 in the past.

 

[a_kelley]

If it's still throwing a cam sensor code after replacement you likely have a wiring malfunction or a bad pcm, though there are other possibilities, the sensor could be seated improperly, (seen it once or twice) a bad new sensor (seen it a few times), or there is the chance that the crank key has sheared off of the timing chain sprocket, throws the cams out of time and causes the same problem. I'm sure there are other possible problems, but these I have seen on a 4.7 in the past.

Well it has power to the sensor, and sounds "normal" turning over without catching (has even sounding compression while spinning over, not gauged) Sensor is seated properly. I was thinking bad new sensor.. we shall dig in further and keep it posted.. getting an analog meter to see if its pulsing (wish I had an oScope)

 

[a_kelley]

If it's still throwing a cam sensor code after replacement you likely have a wiring malfunction or a bad pcm, though there are other possibilities, the sensor could be seated improperly, (seen it once or twice) a bad new sensor (seen it a few times), or there is the chance that the crank key has sheared off of the timing chain sprocket, throws the cams out of time and causes the same problem. I'm sure there are other possible problems, but these I have seen on a 4.7 in the past.

good sensor, good ecm(waving ferrous metal by the sensor made the sense voltage go to ~5v and injector and spark..) checking cam/crank timing tomorrow. my friend is unbelieving that its a mechanical issue. i say there is no such thing as a code for every issue.. btw, i noticed today the exhaust compression sounds uneven-like

 

[a_kelley]

Well, the timing chain going to the head with the sensor was broken (or the idler sprocket came undone or something like that). My friend pulled the valve cover on that side and he said he could lift the chain off the sprocket. Interference engine. 'nuf said. Customer didnt have money to fix it. If it was mine I would have put on timing chain and rolled with it.