3.0 GU TD problem.

Submitted: Saturday, Nov 22, 2003 at 21:13
ThreadID: 8687 Views:1920 Replies:9 FollowUps:7
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What a day I had yesterday. 8.30am and the 3.0 GU is blocking traffic in the centre of Brisbane. Driving through the city I firstly lost power, appears the 'computer' put the vehicle in 'limp-home' mode. Thirty seconds later while trying to move over and let the other traffic past the smoke started. Awesome cloud of black smoke everywhere. I wasn't able to move, so simply parked in the middle of the road, in peak-hour, and waited for a tow. I was amazed at the number of drivers who called out very unfriendly remarks to me while I sat there watching traffic back up. No way I was going to get out and push 3 tonne of vehicle through the traffic on my own, and there was no-one around offering help.

Nissan Service and the RACQ to the rescue.

I was towed out of the way 'to a safe location' and then had to wait for a breakdown person to come and tell me that I would need to be towed again.

Finally towed into a Nissan dealership at 1.00pm to be told by the 'friendly' service person that they were booked out yesterday and Monday, but would look at the patrol 'when they got time'. I wasn't very happy, and I think they got the idea.

After a 'nice' conversation with every 'manager' I could find at the dealership, at 4.00pm they were finally able to tell me that there was a problem with the EGR valve, but it would not be until late Monday before they knew exactly what was wrong with it, or what to do to fix it. This didn't make me any happier.

Now I'm at home with a lovely 15yr old ute that the dealer so graciously lent me for the weekend, and in exchange he has my $60000 piece of steel called the Patrol. Interestingly the ute they have provided has a speedo that doesn't work, a tacho that doesn't work, is missing at least one stud off each wheel, but the air conditioning works.

Has anyone else had a problem with the EGR valve on a Patrol? Yesterday was the first time I'd heard of an EGR valve. I pay mechanics to work on my vehicle and have never had an interest in getting grease on my hands.

I don't need to know about anyone's third cousins neighbours problems, but if you have had a similar problem with the patrol please let me know.

Does anyone know of other items I should insist Nissan check while they are working on the car?

Are there any future consequences of a problem with the EGR valve?

I'm still a bit peeved, but when I calm down, I'm sure I'll go back to loving the Patrol. Despite having no radio for four weeks while it was away being repaired, and spending four weeks waiting for a leaking seal in the automatic transmission to be replaced, (all under warranty), it hasn't been a bad vehicle.

What's really upset me is that in the last two weeks I've put new tyres, shocks and springs into it, and was looking forward to spending this weekend giving it a bit of a bash.
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Reply By: Member - Bob - Saturday, Nov 22, 2003 at 21:22

Saturday, Nov 22, 2003 at 21:22
Andrew,
I think they are all watching Australia get flogged. At least tomorrow you won't be the only one looking for the Prozac.Bob
AnswerID: 38135

Follow Up By: Nomad - Saturday, Nov 22, 2003 at 21:58

Saturday, Nov 22, 2003 at 21:58
Bob

I think at full time that both side were looking for some Prozac.

20 each way to go.

Nomad
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Follow Up By: paul - Sunday, Nov 23, 2003 at 20:10

Sunday, Nov 23, 2003 at 20:10
flogged ? not quite.

But there was something more important game played earlier this year with a round ball (not played with a funny shaped thing in a middle class game in every country except NZ) and England were flogged, in fact both teams in each half, by Australia.

So the win was deserved but hold onto it cause it could be another 37 years ....
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Reply By: Member - jaksun - Saturday, Nov 22, 2003 at 22:38

Saturday, Nov 22, 2003 at 22:38
Congratulations to the English Rugby Union Team in winning the World Cup
AnswerID: 38140

Follow Up By: Member - Bob - Saturday, Nov 22, 2003 at 22:44

Saturday, Nov 22, 2003 at 22:44
Yeah, sadly they looked like the better team all night. But what a senseless game? I've been spoilt by growing up with the greatest game on earth.Bob
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Reply By: joshinthecity - Saturday, Nov 22, 2003 at 23:10

Saturday, Nov 22, 2003 at 23:10
Talk about a thread hijack !
Poor bloke just had his truck explode and you guys start going on about the freakin rugby.... nice.

Andrew, sorry to hear of your drama, I assume your truck is still under warranty?
Mind if I ask what year model ( series ) it is ?

I'll ask about the EGR for you..

Josh.

AnswerID: 38141

Follow Up By: Member - Andrew (Bris) - Sunday, Nov 23, 2003 at 09:28

Sunday, Nov 23, 2003 at 09:28
It's a Nov 2002 model. I'll have had it for twelve months this Tuesday.
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Reply By: Truckster (Vic) - Saturday, Nov 22, 2003 at 23:47

Saturday, Nov 22, 2003 at 23:47
I WANT A 3.0 GU!

OH YES I DO!!!!!!!!!!!
AnswerID: 38144

Reply By: Member - Errol (WA) - Saturday, Nov 22, 2003 at 23:52

Saturday, Nov 22, 2003 at 23:52
What,s an EGR valve ?Why go overseas when you can ExplorOz
ERROL
AnswerID: 38147

Reply By: Member - Hugh (WA) - Sunday, Nov 23, 2003 at 02:50

Sunday, Nov 23, 2003 at 02:50
Hi Andrew,

Sorry to here of your troubles. I hope this gives you some background to EGR valve.

EGR stands for exhaust gas recirculation. EGR is used under part load conditions to introduce exhaust gas (inert) into the inlet manifold to dilute the charge and fill the combustion chamber with only enough air (oxygen) to support combustion. Because part load only requires a small amount of fuel, if there was no EGR the excess air (oxygen) would lead to excessive NOx formation which is bad for emissions control. Also, the EGR reduces inlet manifold pressure, which then reduces the engine's pumping work and hence allows for improved fuel economy.

The use of EGR has been around for quite a while (gasoline and diesel engines), however modern direct injected diesel engines run stratified lean combustion at part load and can tolerate much higher amounts of EGR, with associated emissions and fuel economy advantage. As EGR flow increases, larger valves are required to control the flow of gas. These valves are typically stepper motor devices controlled via the engine ECU. There is a map in the ECU that works out how much to open the valve based on engine speed and pedal position inputs. Bigger valve area and hotter exhaust gas are a designers nightmare. Typical failure modes are sticking valve (carbon) or stepper motor failure (heat). If the EGR valve is truly at fault then it requires replacement.

I'm not familiar with Patrol EGR failures, however I have seen enough prototype EGR valves fail to know they do fail. I am surprised that an EGR valve failure would bring things to a halt though. To prevent such issues, the control strategy (onboard diagnostics within the ECU) is set up that the valve drives closed if a problem is detected (usually before complete valve failure). In this way the engine still functions fine, albeit with increased fuel consumption and worse emissions (engine fault light would come on). How many kms have you done on the GU?

Now I also have a GU Patrol and have experienced first hand the crap service from dealers, most of whom I've found do not have a good understanding of modern engine technology, let alone latest common rail direct injection diesel technology and associated EMS. These guys would have run a diagnostics check and it would have spat out EGR valve as a likely cause. I'd be getting them to explain exactly what was wrong with the valve. Wouldn't surprise me if there was another fault. Early 3L DIs have had ECU problems.

None of the above probably helps too much when your vehicle , however I hope you have a better understanding of EGR and why it's used.

Regards,
Hugh
AnswerID: 38150

Follow Up By: Member - Andrew (Bris) - Sunday, Nov 23, 2003 at 09:32

Sunday, Nov 23, 2003 at 09:32
The vehicles 12 months old and done 47000km.

No lights came on the dash to say anything was wrong.

I couldn't drive it because it was going crazy. Revs were going up and down like a yoyo. It wasn't stopping completely, but alternating from roaring down to almost stopping.
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Follow Up By: Member - Cocka - Sunday, Nov 23, 2003 at 11:36

Sunday, Nov 23, 2003 at 11:36
That's a worthwhile and informative explanation Hugh, not that I have a problem, but we are a little wiser about the workings, thanks.
What you say raises another Q though. ie who can we rely on for competent servicing ?
Many of us do wonder about dealer servicing competency, particularly on TD's. Whilst I read about injector specialists, boost specialists, turbo specialists etc etc. is there really a mechanic about these days who understands the modern electronic diesel and who can balance and tune an engine, or have all these tradesmen been replaced by the introduction of the computer mechanic nerd. Years ago I used to deal with a bloke who would take the vehicle for drive down the street and back then know exactly what the problem was, and he could fix (repair) it.
Unfortunately many of these DIY options are disappearing. My first car was a '29 A Model and over the years I rebuilt that car. My Dad and I had a wonderful workshop which I eventually inherited and I still have a garage full of beautiful tools, but today all of the tuning work requires a computer, so what can I do ?
Where do we take our mobile 4WD comuters. Are ARB, TJM, your mates down the road qualified enough ? Who is a qualified mechanic these days, where do you find him/her ??
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Follow Up By: Member -BJ (Sydney) - Sunday, Nov 23, 2003 at 18:15

Sunday, Nov 23, 2003 at 18:15
My truck mech looks after mine & as he's a 4wdriver himself he knows his stuff. i'm tyring to get him to advertise here so thoe's is Sydney will know of him.Regards Bob
Where to next
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Reply By: mudgutz - Sunday, Nov 23, 2003 at 11:37

Sunday, Nov 23, 2003 at 11:37
yeah sorry to say mate that the egr is only the first of the potential things that will go wrong with your 3.0ltr nissan gu ......the engine technology is right up there with the gods of diesel and i think nissan have it far from sorted out compared to the tried and tested reliability of the 4.2..............it would have been handy for it to stop on you somewhere out back of never never...where the hell do you get an egr valve 300kms west of say mt isa.....we have had several complete failures come through our place.......eg spun main (crank) bearing ....spun big end bearing...big $$$ failures in any engine let alone a diesel...and i wont mention the government dept which seems to be able to break em....but they have little blue and red lights on top and i think they mistake them for pursuit vehicles......i am surprised the egr stopped it alltogether.....it should have just smoked liked bob marley in a field of free pot... and run like a pig but you still should have been able to drive it
the egr is a common failure on the gu 3.0ltr .......... personally i think the engine is too small for the truck.....great thing put into the navara but no good in the patrol.......and no doubt i will get all the comments on how good the torque figures and the power is on the 3.0ltr td compared to the 4.2 which i will agree with ......but i will answer by saying how hard does the little sucker work to do it..........and how reliable has it proved compared to the 4.2 and why does that other japenese manufacturer yeah you know the one with the funny T on the grill not run a 3.0ltr in a cruiser.......i hope you get it back soon to test out that new undercarriage ......a broken truck is like a pub with no beer......F#$%&N useless
AnswerID: 38167

Reply By: Nomad - Sunday, Nov 23, 2003 at 22:09

Sunday, Nov 23, 2003 at 22:09
As another 3LT Gu owner, what can I say after that lot. Almost scary.

I know that there have been various problems with the 3 LT GU's particularly the earlier models. Touch wood, I have obviously been very lucky. Have never had a problem. The truck has only ever been serviced by the original dealer in Ipswich in Qld. Can only hope they know what they are doing but so far so good.

They have impressed me with their honesty and their ability to track my servicing needs through engine, auto trans and even power steering. All servicing is done on fixed quotation. Obviously if there is something else to be done it will cost more but only after you have been informed and agreed and they give you a fixed price to do it.

Compared to previous experiences that is bloody great.

Andrew, I hope all ends well and that you have your truck back soon. I still think $ for $ they are probably the best going.

Cheers
AnswerID: 38221

Reply By: TonyY - Monday, Nov 24, 2003 at 19:29

Monday, Nov 24, 2003 at 19:29
I hope that when you return the 'loaner', you call by the copshop on the way and give them a look!

Then present the dealer with the work order.
AnswerID: 38287

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