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-   -   Check Engine, Crank AND Cam position sensor codes (http://www.jeepforum.com/forum/f19/check-engine-crank-cam-position-sensor-codes-1178642/)

Ruffnek 03-07-2011 10:00 PM

Check Engine, Crank AND Cam position sensor codes
 
I recently swapped in a high lift Comp Cam, lifters, Mopar valve springs and Cloyes dual roller timing set. I originally used the wrong timing mark/keyway combo on the crank gear and tried to start it. Looked up the instructions and immediately figured out the error of my ways.
Anyways, my problem is that I now have a check engine light that is giving "stored codes" for both the Cam and Crank position sensor. Should I be replacing these or did I just confuse them with my install? Will it go off eventually?

Thanks,
Dusty

Ruffnek 03-14-2011 12:34 PM

Bump...Anybody?

laybackman 03-14-2011 06:32 PM

Quote:

Originally Posted by Ruffnek (Post 11115305)
I recently swapped in a high lift Comp Cam, lifters, Mopar valve springs and Cloyes dual roller timing set. I originally used the wrong timing mark/keyway combo on the crank gear and tried to start it. Looked up the instructions and immediately figured out the error of my ways.
Anyways, my problem is that I now have a check engine light that is giving "stored codes" for both the Cam and Crank position sensor. Should I be replacing these or did I just confuse them with my install? Will it go off eventually?

Thanks,
Dusty

You altered the mechanical lift/duration of the valve system. BUT the ECM does not know that so your valve timing is 'off' according to your factory ECM. What did the kit say about this?

Ruffnek 03-15-2011 08:06 AM

Comp Cams actually recommends this cam for fuel injection, so I was assuming it would work with the computer.

GreenDevil 03-15-2011 11:58 AM

Did you try clearing the codes and running your engine afterwords? It is possible that the codes are stored from when you tried to start it with the wrong timing....but don't quote me on that, cause I'm not sure.

laybackman 03-15-2011 12:32 PM

Quote:

Originally Posted by GreenDevil (Post 11161795)
Did you try clearing the codes and running your engine afterwords? It is possible that the codes are stored from when you tried to start it with the wrong timing....but don't quote me on that, cause I'm not sure.

Easiest way to fix that is to dump the learned memory. Remove the + battery cable end and ground that end out for 30 seconds. Put it back on and then see what happens.

If the factory basic values in the ECM cannot recognize the new values needed because you put in a bigger 'bump stick' then to the ECM you have 'jumped time'. See if you are getting any spark at all. You may need to get your stock ECM reprogrammed to match the new cam/lifters you installed to get your timing in sync with those new metal bits. Go to teh site tahe made the cam/lifters and see what they say There are programs/tools to alter a factory ECM if needed. I say if needed to qualify what I m ight suggest.

I am assuming that you put this engine back together again and have it timed properly. That right there might have been a big leap of faith for me!! :D

Ruffnek 03-16-2011 01:23 PM

Quote:

Originally Posted by GreenDevil (Post 11161795)
Did you try clearing the codes and running your engine afterwords? It is possible that the codes are stored from when you tried to start it with the wrong timing....but don't quote me on that, cause I'm not sure.

Done that, light comes back on and still says stored code. That is exactly what I said when they told me what it read, "Could it be because I put the cam in 120 degrees out and tried to start it?"

Ruffnek 03-16-2011 01:30 PM

Quote:

Originally Posted by laybackman (Post 11162026)
Easiest way to fix that is to dump the learned memory. Remove the + battery cable end and ground that end out for 30 seconds. Put it back on and then see what happens.

If the factory basic values in the ECM cannot recognize the new values needed because you put in a bigger 'bump stick' then to the ECM you have 'jumped time'. See if you are getting any spark at all. You may need to get your stock ECM reprogrammed to match the new cm/lifters you installed to get your timing in sync with those new metal bits. Go to teh site tahe made the cam/lifters and see what they say There are programs/tools to alter a factory ECM if needed. I say if needed to qualify what I m ight suggest.

I am assuming that you put this engine back together again and have it timed properly. That right there might have been a big leap of faith for me!! :D

I will try this. Disconnect the + battery terminal and ground it?
Comp Cams says this cam is compatible with FI with no mention of a reprogram. "Xtreme 4x4 series, PN 68-232-4" The lift is considerably higher than stock but the duration is actually a bit less on both sides.
There is no timing adjustment on my engine (That I'm aware of) unless I cut the ears off of the distributor stem so I can rotate it.
It actually runs great, just want the damned light off and make sure I'm not doing any damage anywhere.

Thanks,
DK

laybackman 03-16-2011 01:44 PM

Quote:

Originally Posted by Ruffnek (Post 11171130)
I will try this. Disconnect the + battery terminal and ground it?
Comp Cams says this cam is compatible with FI with no mention of a reprogram. "Xtreme 4x4 series, PN 68-232-4" The lift is considerably higher than stock but the duration is actually a bit less on both sides.
There is no timing adjustment on my engine (That I'm aware of) unless I cut the ears off of the distributor stem so I can rotate it.
It actually runs great, just want the damned light off and make sure I'm not doing any damage anywhere.

Thanks,
DK

DO NOT CUT THOSE EARS OFF!! The ECM will simply correct the timing you alter until it reaches the factory presets, then you get another CEL!

Let us know how you make it after you dump the 'old' learned memory by grounding out the + battery cable end after it has been removed from the battery for thirty seconds or so.

Ruffnek 03-16-2011 01:52 PM

Quote:

Originally Posted by laybackman (Post 11171245)
DO NOT CUT THOSE EARS OFF!! The ECM will simply correct the timing you alter until it reaches the factory presets, then you get another CEL!

Let us know how you make it after you dump the 'old' learned memory by grounding out the + battery cable end after it has been removed from the battery for thirty seconds or so.

Wasn't planning on it, lol! Like I said, it runs great, the CEL just worried me. I will try tonight and report back.

Ruffnek 03-26-2011 09:42 PM

Light goes off but comes back on after a few minutes... :(

laybackman 03-27-2011 08:35 AM

Quote:

Originally Posted by Ruffnek (Post 11245934)
Light goes off but comes back on after a few minutes... :(

What code # does you code reader show?

Ruffnek 04-15-2011 12:03 PM

Dealer (Friend works there) said crank and cam position sensor codes.

Ruffnek 06-01-2012 11:11 PM

Bump, still driving this, have never figured out what the problem was. Runs like a champ with the CEL on.

laybackman 06-02-2012 07:34 AM

Quote:

Originally Posted by Ruffnek (Post 13659474)
Bump, still driving this, have never figured out what the problem was. Runs like a champ with the CEL on.

Since you installed the timing chain set improperly the crank and cam signal are not in sync according to your factory presets in the PCM.

The crank sensor looks for movement and sends a signal to the PCM when it does detect movement. If none is 'seen' you get no spark and no fuel.

I think the cam sensor only times the firing of the plugs. So you adjusted the distributer by swinging the rotor back to make it right or you rewird the plug wires to make it right. Now it runs just fine, BUT the cam and crank sensor signals are not sync'ed. That must be why it runs just fine but the CEL is on. The fix: a 1" piece of electrical tape over the CEL...;)


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