I got codes 0335 and 0336 again and now the car is running like **** again. Is there anyway to check the signals of the ckp or cps??? Cant find it on shoebox's website.

 

That's because my car does not have a crank sensor. Honestly, the sensor should have nothing to do with how your engine runs. The sensor is only there as a watchdog for misfires. Perhaps misfiring is your real problem. OTOH, some people have reported odd things when the sensor was bad. Perhaps it could cause some electrical issues in some way. Your engine should still run with it disconnected, so maybe you could do that and compare how it then runs.

 

Going to try that right now. Thanks for the quick response Rob. Let you know how it works out

 

yes rob, if the sensor fails in such a way as to pull the referance voltage to ground, ALL sensors on that feed will drop out

HOWEVER, any sensor on that circuit can also do the same thing, so, it might not be the crank sensor giving you the crank sensor codes

 

well still pulls codes and still backfires allot. Reved in neutral and when rpms drop blat blat blat. Car is also running hot and headers are glowing slightly again. Aw man I thought I fixed this with the new air/fuels and 02's. Any Ideas Rob?

 

Any diagrams so I can check the wiring for cuts or open ends?? This happened with my 02's I had a cut in the wire with lead to blowing the Engine Fuse with in return stop power from going to the map and making my skip shift malfunction. Once fixed problems went away.

 

what year, 96 or 97?

nevermind, here is a diagram that is interesting

 

Ok got it thanks! Now the ckp it the one on the timing cover correct bottom passenger side? Lets see if its getting power . Thanks dav and for your question its a 97 ws6 M6.

 

yes, timing cover bottom, pass side

 

From the GM code descriptions:

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P0335

SENSED PARAMETER: Crankshaft position sensor circuit malfunction (CKP sensor to low reference)

MONITOR STRATEGY DESCRIPTION: 4X signal - This diagnostic will detect a low duty cycle (circuit failure) from the crankshaft position sensor.

MALFUNCTION CRITERIA & THRESHOLD VALUE(S): 10% < CKP duty cycle < 90%

SECONDARY PARAMETERS & ENABLE CONDITIONS: 9V < Ignition Voltage < 17V; 500RPM < engine speed < 4000rpm

TIME REQUIRED & FREQUENCY: 25 test failures in a 50 test sample; 100mS/test; Continuous

==================
P0336

SENSED PARAMETER: Crankshaft position sensor circuit range/performance/

MONITOR STRATEGY DESCRIPTION: 4X signal - This diagnostic will detect an out of range signal from the crankshaft position sensor.

MALFUNCTION CRITERIA & THRESHOLD VALUE(S): 58.8% < CKP duty cycle < 77.8%

SECONDARY PARAMETERS & ENABLE CONDITIONS: 9V < Ignition Voltage < 17V; 500RPM < engine speed < 4000rpm

TIME REQUIRED & FREQUENCY: 25 test failures in a 50 test sample; 100mS/test; Continuous

=============

Since the signal from the sensor is a square wave, varying from +XV to 0V, it should be a fairly simple check for the PCM to compare the time at +XV to the total time at +XV and 0V. That would be the duty cycle. Something is causing the voltage to either stay high continuously (greater than 90% duty cycle) or low continuously (less than 10% duty cycle). Since P0335 has the widest range of acceptable values, it would be the one that indicates the extreme error in your system.

Obviously a faulty sensor would cause the duty cycle to be outside the acceptable range. But what else could do it? Could voltage supplied from the pink wire be affected by the performance of the other items on the circuit, including the ignition coil and IC module? Could the ground supplied by the pink/black wire be affected by the other device using that same ground (low reference), which is the Opti.

If the sensor isn't bad, you need to look at a couple places - first would be a high voltage wire inducing a high voltage in the wires that connect to the CKP sensor. Any chance you have a high voltage ignition wire too close to the CKP wires? That situation would also affect things like the Opti, since a frequency induced on the low res wire (pink/black) is going to corrupt the Opti high and low res pulse patterns. A problem with the CKP sensor itself might also affect the Opti singals, since its connected to the same low reference wire. That would explain the misfire problems.

Then there is the possibility of problems with the coil or the IC Module corrupting the voltage supply to the CKP sensor, or a prolem with the Opti optical sensor corrupting the low reference ground to the CKP module. A problem with any of these three devices - IC Module, coil or Opti optical sensor would explain the misfires.

Note that the SENSED PARAMETER for P0335 specifically mentions the low reference connection. Maybe that's pointing you to the most likely source.

Just thinking out loud with this one.... but it appears you have several possibilities of interactions between problems with the CKP sensor, IC Module, coil and Opti. Doesn't help much, but attempts to explain the inter-relationship between the CKP codes and the misfires.

Another thing I thought of.... a loose reluctor gear, or intermittent grounding of the sensor would also affect the apparent duty cycle, but that would not cause a misfire, just the code.

 

Ok Checked for power to the ckp and its good. I also checked to see if any spark plug cables were too close to any on the lines and they weren't. The Ignition module was changed like 2 months ago. Only thing left would be the coil and opti. May the sensor in the opti be whats causing this? It seems to do this once in awhile then it goes back to normal. It cant be the MSD 6a I have could it?

 

EDIT: car Shut off why at idle today!! When I tried to start her back up it wouldn't. When I removed the key the car back fired twice. Looked under the hood to see if I could find anything but didn't. After about a min she started back up again and now only with code p0336. Now I'm scared of driving here around. Has the Opti God giving me a second chance?

 

Found out the MSD box was taking a **** and would shut off! Took it off and she stays running. Bud it still runs like ****. Got a new accel opti on the way. Keep you guys informed.

 

It was a lose rotor in the opti! I replaced it today runs like a dream now! thanks guys The accel opti works great!