Diesel GQ Patrol help again pls! .............(3)

Submitted: Saturday, Oct 12, 2002 at 00:00
ThreadID: 2134 Views:3252 Replies:4 FollowUps:5
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I've found my Diesel 93 GQ 4.2 (330000km) is very lack of power.
(1) When I was driving on Hwy, even on some only slightly steep slope, it very quickly drop from 100km/h down to 80 km/h. I may be able to keep up the speed if I flat the accel pedal to floor but I really don't want to push the engine like this. It was very very embrassing since lots of car, 4WD, truck passed me like I am driving a turtle.
(2) I also realize sometime at 3rd/4th gear when accelerating, the engine can't smoothly accelerate as it from 1200 rpm, it run fast slow fast slow till up to 2200rpm (it flutuate). The injector should be fine cos I couldn't see any black smoke at all.
(3) The eng once it rev to 2200, it can hardly go faster. It may be normal but I am not sure.
Note: running Finer filter and 32' BFG M/T

Anybody can give me opinion on my truck ? THanks
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Reply By: mudgutz - Sunday, Oct 13, 2002 at 00:00

Sunday, Oct 13, 2002 at 00:00
i had a problem like this with my cruiser revs up and down .....called surging......the problem was the fuel pump....perhaps you should look there.....i suggest with 330000 kms on it you should get a reco pump and get the injectors serviced......the black smoke has nothing to do with the injectors it usually indicates to much fuel from the pump.....i think yours perhaps isnt getting enough.........might pay you to put new filters
all over the truck as well.......i would expect it to have poor highway performance cause thats the nature of a normally aspirated diesel....you might try extractors on it and it will go a little better.....put the extractors on ...put new filters in yourself then go down a good diesel joint and get the injectors and pump done ....it should run good after that
if you wanted to go quick you should have brought a petrol .......but your diesel will be much more fuel efficient
AnswerID: 7358

Follow Up By: Iamgq - Sunday, Oct 13, 2002 at 00:00

Sunday, Oct 13, 2002 at 00:00
Thanks mudgutz! What a valurable opinion to me! I think the problem may come from the pump since I have already changed the fuel filter myselft but problem do exists. The surge is exceptionally obvious when the Engine is underload say going uphill. I may probably need to service the injector and pump as you suggested.
Do you know any diesel specialist can do the trick? I am living in Melbourne by the way.
Does 4WD specialist can also service the pump? since I know it involve quite a few of special equipment for working on diesel truck.
One more thing, you give me peace of mind since now I realize that short of natural aspirated diesel on Hwy performance and I no longer need to think the problem is on my truck only. Thanks again!
FollowupID: 3378

Reply By: mudgutz - Sunday, Oct 13, 2002 at 00:00

Sunday, Oct 13, 2002 at 00:00
sorry mate cant help you with a good diesel mob in melbourne as im in sydney.........however ask the forum no doubt the melbourne poeple will be able to help you...enjoy the truck the patrols are a good truck once you get it sorted out it should be a good thing......
AnswerID: 7362

Reply By: Will - Monday, Oct 14, 2002 at 00:00

Monday, Oct 14, 2002 at 00:00

The GQ has a fine banjo filter installed inside the inlet banjo fitting.

The filter is not even listed as a filter by Nissan parts...

Remove that banjo bolt, take the filter out , clean it up and refit it.

It blocks up with fine lint from the fuel filter...

It is typical and it is a well known issue with them

AnswerID: 7376

Follow Up By: Iamgq - Monday, Oct 14, 2002 at 00:00

Monday, Oct 14, 2002 at 00:00
Sorry, Will, I really have no idea which part you were talking about since I am not so familar with mechanic.
Would you mind to tell me more detail about that "fine banjo filter" ? For example, where can i find it and what is its purpose. Thanks for your help!
FollowupID: 3393

Follow Up By: Will - Tuesday, Oct 15, 2002 at 00:00

Tuesday, Oct 15, 2002 at 00:00
If you follow the fuel line out of the fuel filter into the fuel injector pump, where it attaches to the injector pump.
You have to remove the bolt which is a banjo type, no need to remove the pipe but be carefull not to drop the washers, stick you finger inside the banjo (usually only the little finger fits) and there is a very fine mesh filter, designed to catch the very fine lint which may come out of the actual fuel filter.
You just clean it up and put it back on...
The filter hardly gets blocked but Nissan had a batch of fuel filters which released this fine particles so the banjo filter became a known issue.
If you don't feel you can do it, take it to your mechanic (does not need to be a diesel mechanic) and show him what you need done.
FollowupID: 3399

Follow Up By: Iamgq - Wednesday, Oct 16, 2002 at 00:00

Wednesday, Oct 16, 2002 at 00:00
Thanks mate!
I will try to do it myself. If I come across any problem, I may ask you again in this forum. Please keep in touch...........thanks!

FollowupID: 3435

Follow Up By: Johnsy - Saturday, Oct 19, 2002 at 00:00

Saturday, Oct 19, 2002 at 00:00
iamgq will has just given you one of the best 4.2 diesel tips.any other nissan 4.2 owners out there it pays to sevice this filter every 15 /20 k regardless of what year and will i didnt know it was the lint out of the filter i thought it might have been waxes out of the fuel .the person who told me about it actually thought he had blown the turbo thats how bad it can get . johnsy
FollowupID: 3496

Reply By: Truckster - Friday, Oct 18, 2002 at 00:00

Friday, Oct 18, 2002 at 00:00
The Diesel is no rocket ship.

Injectors, filters, and not much else...

I have put a Denco Turbo system on my GQ recently, and its a new car, the wife even spins up the 33's on the road :)
AnswerID: 7594

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