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p303 code
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=69614		 Page 1 of 1
Author:  99sportcummins [ Tue Jul 17, 2012 9:16 pm ]
Post subject:  p303 code
I cant seem to find out whats causing this code. It idles fine when cold but as soon as it gets up to operating temp it idles rough, but drives fine. I swapped the number 2 and 3 injector and code stayed with the number 3 cylinder. I just replaced the glow plugs cause number 3 was cracked, changed timing belt and deleted egr.
Author:  Billwill [ Wed Jul 18, 2012 9:48 am ]
Post subject:  Re: p303 code
99sportcummins wrote:
I cant seem to find out whats causing this code. It idles fine when cold but as soon as it gets up to operating temp it idles rough, but drives fine. I swapped the number 2 and 3 injector and code stayed with the number 3 cylinder. I just replaced the glow plugs cause number 3 was cracked, changed timing belt and deleted egr.



You sure your Kerma tuner is not causing the problem?

I cannot find the P0303 code in my 2002 DTCs and the 2006 DTCs only states that it is a misfire for cylinder 3 with advice on what to do for the 3.7 gasser but nothing for the CRD.

How have you extracted that code? :?
Author:  papaindigo [ Wed Jul 18, 2012 10:43 am ]
Post subject:  Re: p303 code
If you look in the 2006FSM (05 FSM lacks code info) that's linked on Sir Sam's NOOB site on pg 9-895 you will find P0303 listed as a valid diesel code but it's still misfire on cylinder 3. Don't know if the diagnostics will help.
Author:  Hexus [ Wed Jul 18, 2012 6:16 pm ]
Post subject:  Re: p303 code
Were any of your old ceramic glow plugs missing their ends when you changed them out?

Bad news if so....
Author:  99sportcummins [ Wed Jul 18, 2012 8:37 pm ]
Post subject:  Re: p303 code
No luckily, number 3 just had a crack in it
Author:  Hexus [ Thu Jul 19, 2012 8:51 am ]
Post subject:  Re: p303 code
If it were my engine and I was trouble shooting it, I would probably say that it's either a bad/clogged injector at this point, or an issue with the ECU programming.
Author:  Billwill [ Thu Jul 19, 2012 10:53 am ]
Post subject:  Re: p303 code
papaindigo wrote:
If you look in the 2006FSM (05 FSM lacks code info) that's linked on Sir Sam's NOOB site on pg 9-895 you will find P0303 listed as a valid diesel code but it's still misfire on cylinder 3. Don't know if the diagnostics will help.


Stupid question I suppose but how is a misfire detected on a CRD?
There are not any knock detectors....I presume it is the monitoring of the individual fuel injectors' current flow. :?
Author:  Billwill [ Thu Jul 19, 2012 11:05 am ]
Post subject:  Re: p303 code
99sportcummins wrote:
I cant seem to find out whats causing this code. It idles fine when cold but as soon as it gets up to operating temp it idles rough, but drives fine. I swapped the number 2 and 3 injector and code stayed with the number 3 cylinder. I just replaced the glow plugs cause number 3 was cracked, changed timing belt and deleted egr.


Maybe you should try swapping injector 3 again...this time with number 1.

I know from my 34 years in fixing mainframe computers and industrial robots I would sometimes take out Part A and put it aside. Then I take out Part B and put it next to Part A. Then I get distracted and pick up the parts in the wrong order and put them back in their original positions but think that I have swapped them over. :oops:

At least I can own up to this now....I am retired and can not be fired. :lol:

Just saying. If you are sure you did not such a dumb thing then please ignore this advise. :)

Could be a wiring or connector problem....try measure the injectors leads all the way to the ECU. :?
Author:  99sportcummins [ Thu Jul 19, 2012 6:27 pm ]
Post subject:  Re: p303 code
i numbered them before i removed them so i know i got them swapped correctly. i guess ill start chasing wires and see if i can find bad spot.
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