Jackaroo Starting Problem
Submitted: Thursday, Dec 22, 2005 at 18:40
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GraemeC
Hi, my 99 Deisel Jackaroo does not want to start all the time. The problem is interminttent but worst when it is cold - start of day, after work. Turns over & over with no sign of ignition then it starts. Could have been 15 minutes off & on trying. Other times in same circumstances it fires first time. No pattern at all. My mechanic (deisel 4wd specialist) has not yet nailed it down. It is not showing any error codes on the management unit. He has changed filters, oil pressure seems fine.
Yesterday he change the glow plugs. came out this morning and no start AT ALL. It was towed back to workshop where if promptly started first go for him. Talk about frustrating? Would seem electrical as it is intermittent but what. Any leads would be greatly appreciated.
Catching the ferry from Melb. to Tassi on Tuesday......if it starts!!
thanks Graeme
Reply By: Axle - Thursday, Dec 22, 2005 at 19:31
Thursday, Dec 22, 2005 at 19:31
Graeme.
Could
well be that its sucking air , especially when its cold , diesel thicker so to speak, pump has to pull a lot harder.
Check all fuel line fittings from tank back to injector pump. Just a thought.?
Regards Axle
AnswerID:
145133
Follow Up By: GraemeC - Thursday, Dec 22, 2005 at 20:46
Thursday, Dec 22, 2005 at 20:46
Thanks for that Axle, I think my mechanic has thought that also. He asked me to fill the tank in case it was a crack pick-up in the tank, he replaced the filter and
check out all the line thinking it might have been sucking air somewhere. But nothing evident. Mechanic thinks the problem is very very wierd. thanks for the though, Graeme
FollowupID:
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Follow Up By: dieselup - Thursday, Dec 22, 2005 at 20:47
Thursday, Dec 22, 2005 at 20:47
Is the Jackaroo fly by wire or mechanical fuel system?
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Reply By: GraemeC - Thursday, Dec 22, 2005 at 20:51
Thursday, Dec 22, 2005 at 20:51
It is fly by wire that drives it.
AnswerID:
145154
Follow Up By: dieselup - Thursday, Dec 22, 2005 at 21:33
Thursday, Dec 22, 2005 at 21:33
I asked because our 3.0L td Ppatrol had the same problem for quite a while (although not that bad) before I found metal in the oil filter
The computer control diesels seem to have little problems across the board ,dirty sensors sending wrong signals - overboosting, underfueling etc, probably there were no fault codes because the computer thinks its doing the right thing
The worst part about it is that the hard starting problem could lead to more serious engine damage if it's not sorted out
The good old mechanical diesels seem to be the way to go we traded ours in on a 4.2 na Criuser with a thottle cable!
FollowupID:
398671
Reply By: Member - Bradley- Friday, Dec 23, 2005 at 01:47
Friday, Dec 23, 2005 at 01:47
hi graeme, jump onto australia4wd.com and there is a dedicated section in the isuzu
forum just for these motors, 90% of the time the prob is due to the wrong oil being used, it is CRITICAL that the right grade of oil is used in these motors, as the injectors are an electrical/hydraulic unit that requires the oil pressure signal through a tiny orifice as
well as the electrical signal to operate.
Holden couldnt even work this out for ages, that is why they started fitting dual batts to the td jacks, so they could crank longer. Most workshops just stick normal 15w40 in em, which stuffs em straight away..
AnswerID:
145196
Reply By: Rigor - Friday, Dec 23, 2005 at 09:58
Friday, Dec 23, 2005 at 09:58
Hi Graeme , I also own a 3.0 L Jack , I have tried to learn as much as possible about the engine management on my vehicle for obvious reasons , although never had any serious problems , I did have a sticky valve in the fuel cap which when the tank cooled it would contract and suck fuel from the system , you could try primeing before attempting starting . The fact that no error code is set would point me to something simple and mechanical as the ECU has lots of checks and balances . Good luck
Dave L.
AnswerID:
145229
Reply By: Original Banjo (SA) - Friday, Dec 23, 2005 at 10:01
Friday, Dec 23, 2005 at 10:01
Indeed re the comment above on oil Graeme but you probably have that covered - if its starts happily "at times", oil is not the factor (you are probvably on 10W-40 anyway - mild climate - thinner for cold areas) - certainly does sound like electrical intermittent - they are a compltete bugger to find. BOL.
AnswerID:
145230
Follow Up By: GraemeC - Friday, Dec 23, 2005 at 10:27
Friday, Dec 23, 2005 at 10:27
Thanks for the Ideas. The Oil is fine we have always been very very fussy about that. I think Penrite has a new oil in recent month which is now being used.
The problem is only every for most dead cold starts, during the day it is fine. On the times it fails to start it also runs like a dog until warmed up.
Graeme
FollowupID:
398752
Follow Up By: Original Banjo (SA) - Friday, Dec 23, 2005 at 11:30
Friday, Dec 23, 2005 at 11:30
Hmmmm - maybe the oil management, as opposed to the oil itself could be the go......IF the oil doesn't get up to the rail, she won't run of course.... IF the oil gets up to there with an intermittent flow, that might explain the crappy running - when it warms up the oil is thinner and can make it ok ... ? Is it possible that the pressurised oil system from the sump, through the dedicated pump (there is two), then the small filter (I think) and the lines and possible valves in there is playing a part ? Still a bugger to analyse I guess - when it won't run, it'd be nice to tap into that system with a guage and see if there is pressure a plenty.
FollowupID:
398765
Reply By: GraemeC - Saturday, Dec 24, 2005 at 09:16
Saturday, Dec 24, 2005 at 09:16
Yipppeeeeee. thanks he found it (we hope!!). It started cold this morning instantly. My mechanic replaced an oil sender. Using the devise to read the engine management it had not logged fault codes but showed the it had oil pressure at the top when it was not going. Tried it on another Jackaroo and it showed no pressure. Seems it was getting the wrong signal.
He changed the appriopriate sender and things are looking positive.
Let hope it continues. Thanks so much for the comments and ideas.
much Christmas Cheer, Graeme
AnswerID:
145380