Code P1391 Intermittent loss of CMP or CKP

[afas]

I have been stuggling with this vehicle on and off for approximately 6 months. It has intermittent problem after driving for 15-20 minutes, then only acts up for about 1-2 minutes while driving. Runs real rough and acts like it's missing bad. Sometimes it will store a P0300 along with the P1391. It's been to the dealer twice, and I have replaced CKP, new distributor, cap, rotor, plugs and wires. Compression is good and wiring all checks out. Car really didn't act up all winter but now that it's warming up, started acting up again. Customer was talking with another Cirrus owner who had similar problem and told him it was the fuel pump. Any one else run into this before?

[KM@PROAUTOTECH]

Originally Posted by afas

I have been stuggling with this vehicle on and off for approximately 6 months. It has intermittent problem after driving for 15-20 minutes, then only acts up for about 1-2 minutes while driving. Runs real rough and acts like it's missing bad. Sometimes it will store a P0300 along with the P1391. It's been to the dealer twice, and I have replaced CKP, new distributor, cap, rotor, plugs and wires. Compression is good and wiring all checks out. Car really didn't act up all winter but now that it's warming up, started acting up again. Customer was talking with another Cirrus owner who had similar problem and told him it was the fuel pump. Any one else run into this before?

If you think it's the fuel pump Current Ramp(amps) the fuel pump. Is the distributor OEM or rebuilt aftermarket? Hwave helped 2 others on here with problems, both were aftermaket dist. Trying to do this by symptom with no test results will be an uphill battle.

[afas]

Vehicle won't be here again until Wednesday. I have not checked the pump at all but plan on doing so. Yes, the distributor was an aftermarket from NAPA and we tried 2 different distributors from there. Sorry about not having any other specs. I haven't touched this car in about 3-4 months now.

[mopar]

Have had trouble diagnosing this same concern. First if you have a labscope. Labscope the cmp & ckp sensors at the pcm (powertrain control module) signal wires. cmp connector 1 pin 33---ckp connector 1 pin 32. If your sure the signals look good the problem is probably not cmp or ckp. Here goes. If you can get the concern to act up for 1 or 2 minutes monitor the iat sensor(intake air temp) if it starts going high your problem is most likely the E.G.R. VALVE. To test this further make a gasket and block off the egr valve and redrive the vehicle. EGR valves will set both of those faults and not tell on it's self. By the way aftermarket distributors SUCK. (Factory distributors only)

[KM@PROAUTOTECH]

Originally Posted by afas

Vehicle won't be here again until Wednesday. I have not checked the pump at all but plan on doing so. Yes, the distributor was an aftermarket from NAPA and we tried 2 different distributors from there. Sorry about not having any other specs. I haven't touched this car in about 3-4 months now.

If you look at replies, from me and Nick, you will see, we helped out a tech with problems on same system, had bad dist. The replacement was worse, and it was rebuilt aftermarket.

Again, would want more info. as oppossed to case study symptom diagnosis.