- Location
- Westminster, SoCal
OK, so here it goes:
it's a 94 XJ, manual transmission, and it has brand new crankshaft position sensor and camshaft position sensor. The symptoms are as follows:
1. No spark during no start
2. Sometimes it starts and then it seems to be working for a while. Just to see how it behaves (it started fine about a dozen times in a row) I took it for a test drive. While driving I have noticed that every so often the tach would spike or drop (no other sensors or indicators behaved badly at the same time eliminating potentially ground issues). This leads me back to it being CPS related as it is getting bad readings from it. So the question of the day is as follows:
Is the signal from the CPS going directly to the cluster or is it routed through the PCM always? Is there any way to test the CPS behaviour (even though it's a new one it does not do what it is supposed to do)? I have looked at wires beteween the CPS and the PCM and they appear to be all intact. I have cleaned the connection where the CPS plugs into the engine harness and it appears to be looking good....... so what next?
it's a 94 XJ, manual transmission, and it has brand new crankshaft position sensor and camshaft position sensor. The symptoms are as follows:
1. No spark during no start
2. Sometimes it starts and then it seems to be working for a while. Just to see how it behaves (it started fine about a dozen times in a row) I took it for a test drive. While driving I have noticed that every so often the tach would spike or drop (no other sensors or indicators behaved badly at the same time eliminating potentially ground issues). This leads me back to it being CPS related as it is getting bad readings from it. So the question of the day is as follows:
Is the signal from the CPS going directly to the cluster or is it routed through the PCM always? Is there any way to test the CPS behaviour (even though it's a new one it does not do what it is supposed to do)? I have looked at wires beteween the CPS and the PCM and they appear to be all intact. I have cleaned the connection where the CPS plugs into the engine harness and it appears to be looking good....... so what next?