GU Patrol Speed Sensor??

Submitted: Wednesday, Jul 30, 2003 at 11:03
ThreadID: 6257 Views:3906 Replies:5 FollowUps:7
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Hi...can anyone shed light on a fault where a 2.8l GU will for no reason start running rough or just stop when idling, and the tacho will not work. Its a friend of mines and he has been told its a 'speed sensor' and its around $4k to fix. Otherwise he's thinking of changing to a different motor all together.
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Reply By: Truckster (Vic) - Wednesday, Jul 30, 2003 at 11:30

Wednesday, Jul 30, 2003 at 11:30
Fuel sensor you mean??

Someone else said that the other day, I laughed! nearly cheap to go with an engine conversion...
AnswerID: 26331

Follow Up By: Aussieducker - Wednesday, Jul 30, 2003 at 12:02

Wednesday, Jul 30, 2003 at 12:02
Could have been that,
he's not very mechanical and he wasn't 100% on his description.
Any recommendation for what type of engine conv. He mentioned V8's.
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FollowupID: 17932

Follow Up By: Truckster (Vic) - Wednesday, Jul 30, 2003 at 13:28

Wednesday, Jul 30, 2003 at 13:28
I'd be doing lots of checking first, that price is insane. I think someone is pulling his puddin for him.

The air flow sensor for 3.0 GU's are $1200..

Engines?? Buy a smashed VN commodore V8, get engine and everythign you need for $2000 wreck the rest of the car, the engine costs you nothing in the end.

Or look in tradingpost, theres 1000's of Chevs in there forsale.
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FollowupID: 17940

Reply By: Michael - Wednesday, Jul 30, 2003 at 15:57

Wednesday, Jul 30, 2003 at 15:57
Hi Aussie, Who told him what the problem was? If it was a sales chick in the automotive section in K-mart, everyone knows those girls dont know much about Nissan diesels. He should have it diagnosed at a Nissan dealer and a firm price for repair quoted if he hasn't done so already. It kinda puts an end to the speculation of what it may be . regards Michael
AnswerID: 26356

Reply By: Member - Bonz (Vic) - Wednesday, Jul 30, 2003 at 20:09

Wednesday, Jul 30, 2003 at 20:09
My speed sensor sits in the passenger seatSo many places to go!
So much work to do :0(
AnswerID: 26377

Reply By: Eric - Wednesday, Jul 30, 2003 at 22:38

Wednesday, Jul 30, 2003 at 22:38
The two major problems I have come up against in the 2.8 L TD is the Diesel pump , and the intercooler floods with oil stoping air flow , the intercooler usually makes them stall at idle ,and the pump makes them unposible to start when hot
AnswerID: 26399

Follow Up By: Member - Donald L- Wednesday, Jul 30, 2003 at 23:03

Wednesday, Jul 30, 2003 at 23:03
Eric,
At what KM travelled does the problems you have mentioned occur,
cheers
DonaldGet out there and use it.
Life is too short not to.
All the best...
Donald
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FollowupID: 18017

Follow Up By: Eric - Thursday, Jul 31, 2003 at 07:54

Thursday, Jul 31, 2003 at 07:54
Most of the pumps let go at around 200.000 kms give or take 30.000 kms but i find oil in the intercoolers with as low as 130.000 kms , we send a strong degreeser through the intercooler every 15,000 kms just to keep it cleen . At around 180,000 we usually find a low comp around 3 and 4 , this always ends up been a valve seat only .cheers
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FollowupID: 18024

Follow Up By: Member - Donald L- Thursday, Jul 31, 2003 at 12:18

Thursday, Jul 31, 2003 at 12:18
Eric,
thanks,
Another thread.... Industrial centrifugal air compressors are several turbo-charger type air compressors rotors in series driven off a large bull gear rather than an exhaust gas expander turbine and travel between 20,000 and 30,000 RPM each , from my experience as a Rotating Equipment Engineer quite often there is lube oil migration into the air system on the Low Pressure rotor which would be quivalent to a single rotor T/C unit such as fitted to our Diesel 4X4's . The pressure differential of the lubricating oil pressure being higher than the air, has anyone checked out the oil seals in the turbo's by a strip-down & measure to see if that is the culprit as they run at very high RPM , poor cooling circulation through the turbo charger can cause poor heat exchange & subsequent premature wear to seal & bearing components just like excess solids in the oil. An excessivly dirty inlet air filter won't help either with oil migration.
cheers,
Donald
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FollowupID: 18049

Reply By: Guy - Thursday, Jul 31, 2003 at 12:12

Thursday, Jul 31, 2003 at 12:12
I have a GU 2.8 liter TDiesel. The speed sensor or anything else is controlled by the MCU Motor control unit or ECU (Emission control unit).
The sensot is on the transfer case and goes to the computer ECU.
You should have a faultshowing on the dash board.
If you haven't it is probably something simpler like bad fuel and the fuelk filter got to be changed and the fuel tank completly cleaned.
I had that in Alice Spring at the Woolworths diesel station.
The engine could not go above 2000 rpm at any speed 100 kms after filling up.
Buy a manual. I know they are pricy but this will stop you listening to the BS of the so call experts in the garages and outside the garages.
I have the two manuals and I am so glad I bought them. $400 for the two.
The BS that the Nissan mechanics tell you is incredible.
They'll try to contradict the technical manual to use short cuts and charge more.
Guy
AnswerID: 26421

Follow Up By: ramp - Thursday, Jul 31, 2003 at 13:39

Thursday, Jul 31, 2003 at 13:39
hi guy,where did you buy the manuals for that price(second hand)as i have been quoted alot dearer.have been waiting for gregorys to bring one out and been told there should be one out soon on all gu models, cheers
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FollowupID: 18053

Follow Up By: Eric - Thursday, Jul 31, 2003 at 16:47

Thursday, Jul 31, 2003 at 16:47
Guy
Dont want to act smart or something , but I am sure the bad fuel wont make his tacko stop working , I do agree with the purchase of the manuel . At lest you can test all your sensors with a multymeter
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FollowupID: 18065

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