Jackaroo intermittent low revs/ idle fault

Submitted: Wednesday, Aug 21, 2002 at 00:00
ThreadID: 1778 Views:1820 Replies:2 FollowUps:4
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I have a 1998 3 Litre Diesel Jackaroo that has developed an intermittent fault.
At idle or at low revs the engine occasionally coughs/lacks powers. At Idle it will drop from approx 800 revs to 400 revs for few seconds. This problem only begins after the motor has warmed up or in cold conditions when the engine heat up switch turns off. It is particularly noticeable whilst travelling downhill in 4th or 5th gear at 1500 revs or lower. To date I have replaced the fuel filter, checked fuel for contamination, had the throttle body de-carboned, the EGR value removed, cleaned and checked (previous EGR valve has already been replaced), also had injector wiring checked.
Any suggestions on what might be causing this problem?
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Reply By: damien - Wednesday, Aug 21, 2002 at 00:00

Wednesday, Aug 21, 2002 at 00:00
David, it might seem like a silly question, but when was your last oil change & what viscosity oil are you using?
AnswerID: 5892

Follow Up By: David - Thursday, Aug 22, 2002 at 00:00

Thursday, Aug 22, 2002 at 00:00
damien, thanks for your reply, most appreciated, am using shell helix super 15w 40w . The oil and filter was changed about a week before this problem first developed. The vehicle has been running on this type

of oil without any problems for a couple of years now.
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FollowupID: 2579

Follow Up By: Damien - Friday, Aug 23, 2002 at 00:00

Friday, Aug 23, 2002 at 00:00
David, though probably not the cause of this particular problem - it looks as though Eric may have sorted it out for you - i would highly recommend that you look at using a 10/40 or even a 5/40 oil. I have found that my Jack starts easier & runs smoother with the 5W/40 rather than the specified 15W/40.
Just out of interest, what type of fuel economy are you getting??
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FollowupID: 2595

Follow Up By: David - Tuesday, Aug 27, 2002 at 00:00

Tuesday, Aug 27, 2002 at 00:00
Damien,fuel economy at best generally around 10l per hundred K ;loaded, towing a camper trailer or travelling at 110 kph over an extended period closer to 12l per hundred K. Fuel economy is best at around 100kph. David
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FollowupID: 2662

Reply By: Eric - Wednesday, Aug 21, 2002 at 00:00

Wednesday, Aug 21, 2002 at 00:00
David
Your motor has a cold cylinder so when the glow plugs go out the cylinder is not hot enough to ignight the fuel, this can be a dirty injector or the thermostat is not allowing the motor to warm up.
Eric
AnswerID: 5894

Follow Up By: David - Thursday, Aug 22, 2002 at 00:00

Thursday, Aug 22, 2002 at 00:00
Thanks Eric , I'll pursue this line of inquiryand hope it is the solution to the problem. The vehicle is presently back at the mechanic for the third time in the past three weeks to have the problem rectified.
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FollowupID: 2580

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