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29-12-2015
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Senior Newbie
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Join Date: Aug 2010
Location: perth
Posts: 95 What Jeep do I drive?: JK
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08 jk CRD intermittent hard start
Im running out of options here
Ive changed the fuel filter
had the battery checked at repco said was fine
cleaned battery terminals
cleaned start motor connector
checked fuses
Is there anything else i can check at home before i take it somewhere?
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KK 2.8 09
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29-12-2015
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Full Flexer
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Join Date: Feb 2003
Location: South Australia
Posts: 758
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is it cranking at full speed? Does it when hot or cold?? Do a search on here this has come up several times. IIRC it was a low fuel pressure issue caused by common rail supply pump but do the search and go from there
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29-12-2015
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CrawlerStar
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Join Date: May 2010
Location: Perth WA
Age: 54
Posts: 614 What Jeep do I drive?: KJ
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just some added info..
A common fault I get in my workshop with the JK CRD are faulty fuel pressure regulator, faulty fuel pressure sensor. But the symptoms are cutting out while driving along (faulty regulator), engine light coming on with the "ping" (faulty sensor), I generally change both out as a pair. But these faults are a common rail diesel thing and are related to long change intervals of the fuel filter, hence why I do fuel filter changes every 10,000kms.
If your symptoms are:
*long cranking when cold.
*Starting seems to improve as it warms up.
*Everything else has been checked, fuel,
It's likely to be a poor or loose earth, follow the earth battery lead and remove, clean, tighten, see what it does.
Regards
Daz
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29-12-2015
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Senior Newbie
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Join Date: Aug 2010
Location: perth
Posts: 95 What Jeep do I drive?: JK
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Quote:
Originally Posted by Johnboy
is it cranking at full speed? Does it when hot or cold?? Do a search on here this has come up several times. IIRC it was a low fuel pressure issue caused by common rail supply pump but do the search and go from there
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Yes cranks at full speed and both hot or cold
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KK 2.8 09
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29-12-2015
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Senior Newbie
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Join Date: Aug 2010
Location: perth
Posts: 95 What Jeep do I drive?: JK
Likes: 1
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Quote:
Originally Posted by DarrenR
just some added info..
A common fault I get in my workshop with the JK CRD are faulty fuel pressure regulator, faulty fuel pressure sensor. But the symptoms are cutting out while driving along (faulty regulator), engine light coming on with the "ping" (faulty sensor), I generally change both out as a pair. But these faults are a common rail diesel thing and are related to long change intervals of the fuel filter, hence why I do fuel filter changes every 10,000kms.
If your symptoms are:
*long cranking when cold.
*Starting seems to improve as it warms up.
*Everything else has been checked, fuel,
It's likely to be a poor or loose earth, follow the earth battery lead and remove, clean, tighten, see what it does.
Regards
Daz
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Thanks i will have to check them out
This seems like it could be the problem as before after an fuel filter change (2000k)i was getting p0087 (Fuel Rail System Pressure Too Low) and after i changed the fuel filter again the code did not come back.
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29-12-2015
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MudSplasher
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Join Date: Jun 2012
Posts: 1,758
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08 jk crd, Id put money on the injectors starting to go out of spec, I have already changed 12 jk crd injectors this month. . how many km's on it?
If you have got the low pressure rail warning then its as darren said, the pressure sensors in the rail, I have come across 3 other cars in the past 3 months that have had/having these problems.
But also keep an ear out if the intake pump is priming while it has a failed/delayed start? there has been 2 cases I worked on were the TIMP randomly wouldn't trigger the pick up pump and prime the fuel system, leaving to delayed or long cranking before starting
*fuel filter is on the low pressure side, so even a semi blocked fuel filter won't give of a low pressure warning once, unless its completely blocked and preventing flow, which the car will not run as the high pressure pump would not have enough fuel to maintain pressure (under 2000psi and injectors stop firing)
There is a CRD facebook page where problems like this are posted,
https://www.facebook.com/groups/JKCRDowners/
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29-12-2015
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Senior Newbie
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Join Date: Aug 2010
Location: perth
Posts: 95 What Jeep do I drive?: JK
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I looked at the fuel pressure
120-160psi with key in ignition not running
5000psi running
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KK 2.8 09
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