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Old 04-15-2013, 04:06 AM
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2.7 CRD probs

2.7 CRD probs
Hi All,

New owner of Grand Cherokee 2.7 CRD.2002.70k miles. Intend to sort out minor/medium probs myself.
On reading other threads many probs are common. would someone mind comment on following or give me silver bullet sites for solutions.
1. Cold start. With temps around 0 My good battery needs to be at top charge to start even with 2 or 3 preheats of gloplug. This has meant keeping a charger on at night. - no faults in alternator or batt. A mechanic cleaned injectors 1234 but usual prob of dropping engine to do 5,6. I gather carbon deposits on collar location of heating ring on injectors can cause. For now I am trying a fuel additive (Lucas) to clean.
2. Possibly associated. I have yet to see the running temp above 70C and wonder if inefficient burning of fuel is causing carbon buildup on the injector nozzles. I was about to change the thermostat, but saw others refer to this op.temp as the norm. Odd that temp doesn't reach 90 C with a closed thermostat.
3. Box minor contacts prob. On seeking drive D position I need to click in and out a few times to achive 1. pilot light and 2.a shunt from the drive to be sure engaged, otherwise I can take off and the box won't change up. ATF and filters have been changed.
4. How can you see any warning codes from the OBD without dealer rip off.

Looking forward to shared experience

patrick
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Old 04-15-2013, 06:59 AM
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Re: 2.7 CRD probs

Hi Patrick, not that familiar with the crd, but lets see until where we can go.
The 2.7 crd is a 5 cylinder when iīm not wrong. Is the engine turning over good when trying to start, or is it really slow? I remember the diesel car i drove before i had to change the glow plugs for this same reason, they donīt glow sufficient anymore after time and this will first show up on cold days.
Regarding the transmission shift, there are several reed type switches in the shifter assy, one for each position, which will send the shifter lever position to the TCM. I would check the integrity of the assy and see if nothing is loose. A too big distance between the switch and its target will give problems.
To see the PCM fault codes you need to do the key dance: ignition switch off/on three times and leave it in on at the third time. The odometer will show the fault code(s) one by one, or DONE when all ok.
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Old 04-15-2013, 07:17 AM
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Re: 2.7 CRD probs

You the man FRANGO.

Many thanks

Patrick
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Old 04-16-2013, 05:47 AM
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Re: 2.7 CRD probs

You should need to charge the battery every night to get an efficient start each morning so as stated glow plugs and controller should be checked.

Also get your battery load tested and make sure it really is top condition. Don't just go by a multimeter reading. The 2.7 is even more voltage dependant all round than the petrol. Before trouble shooting anything on the 2.7 ensure the battery is spot on. A low battery can still start the car but trigger all sorts of fault codes.

You will find very few code readers other than the dealers that will diagnose the 2.7 properly. Even many good mechanic shops tools do not work properly and even less can diagnose gearbox faults. Even if they have a reader that appears to work don't believe everything you see.

Has it been starting fine till the cold weather, keep an eye out for air leak back in the fuel lines and pumps. There are several orings in the fuel system and any one can start causing hard starting with air bleeding in.

What ATF was used in the auto service, are you aware the MB spec fluid is different to the V8 boxes and can cause issues.

If I can put it up here you should check out the ausjeepoffroad.com.au forum here in Australia. There are several 2.7 owners on the forum with a lot of issues covered, particularly with fueling and starting as well as spare parts sourcing. Knowledge on the 2.7 is limited and in fact over here even most dealers are in the dark about it.
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Old 04-16-2013, 06:19 AM
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Re: 2.7 CRD probs

Hi FESTER,

How generous. Thank you. I will follow your advice and warnings.

Patrick
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