I took my car to a friend of mine who works at a shop and had them scan it, no charge.He told me light was coming on because the crank sensor was out. So I replaced. Car drove fine for about three weeks and now it is back. Also was feeling a wired vibration that I have posted about in other threads that goes away when I change the crank position sensor that is back as well. When searching for this problem I read that I can have the guy who tuned my PCM tune out the sensor? Also, probably a stupid question, but can I just unplug it? I did that once an car seemed to run better.That might have just been in my head though. Any help would be appreaciated because this is annoying.

 

The sensor does not affect the way the engine runs. Its only there for OBD-II misfire detection. If it has been "tuned out" there is no need for the sensor to be there or to be connected, other than to plug the hole in the timing cover.

Is is possible the reluctor gear on the crankshaft is loose, and starts hitting the sensor?

 

When we got the engine back from the machine shop and put the reluctor back on it felt tight, and when I pulled the new sensor out it had no scratch marks or dings of any kind so it hasn't been hitIt has not been tuned out yet though, I was just wondering if that would solve problem by getting rid of sensor all together and what would happen if I just unplugged it.

Just got back from Autozone and had three codes. The only one related to the crank was

P 0336. And I check the wiring and it looks fine but I have not check for shorts down there yet.

If it is detecting a mis would it not retard the timing?

 

If you unplug it your car may be a pain in the butt to start. The OBDII also uses the crank sensor to fire cylinder one. I did that to my car and it would take several attemts to start it in the morning.

 

If its detecting a miss, it causes the SES light to flash. It will also be incrementing the miss count for each individual cylinder (can be scanned if the scanner has "enhanced parameters" capability). It wouldn't retard timing. Unplugging the sensor will turn on the SES light, if it hasn't been programmed out of the PCM.

If the sensor was correctly "programmed out", it wouldn't be setting a code. P0336 sets when the PCM detects an out of range duty cycle on the sensor. Have you checked the wiring harness for corrosion? Have you checked to make sure that there are no high voltage (ignition level) wires in close proximity to the CKP sensor wire?

Bad news.... the PCM has to have a reference signal from the Opti to evaluate the CKP sensor signals. If the Opti pulse pattern is corrupt, it may show up as a CKP sensor code. Check you Opti harness connectors for corrosion and/or damaged pins.

 

So is the only way to "delete" the need for the sensor is to switch to OBD1 ?

 

you can get them tuned out

I had bryan herter tune mine out from pcmforless

 

No. I never said that. There is no "need".... its only there to aid diagnostics.

 

What are the effects on emissions when the sensors are tuned out of an ODBII car? Do they show up as not equipped or not ready?

 

Mine was doing the exact same thing you have headers the wires running on the passenger side they are touching. You have to move the wires away from the headers trust me there touching.

 

when they tune out the sensor they just go into the pcm and tell the pcm not to flash the code for the cps.

so it will not show up on the check engine light, and you will still pass emissions. unless you have a really **** inspector