chewing the diesel

gary_in_nz · Post by **gary_in_nz** » Fri Jan 04, 2008 7:05 pm

my 88 gq sucks through some diesel almost as bad as my landy, well mabey not that bad, but does use more than i would think it would.

its a standard GQ short wheel base, NON turbo 4.2 diesel, 5 speed manual, running standard size road tyres on it, 31's. I fill my tank and can't quite get 500 kms from it?? just wondering what everyone else experiances, and if there is anything to do to these that might help out a little.

I threw it on the weigh bridge at work today and it came in at a solid 2,300 kgs exactally with half tank of gas. I guess thats why they are the 'baby hippos'!!

Jerry · Post by **Jerry** » Fri Jan 04, 2008 7:07 pm

Is it smoking badly ?

Taz · Post by **Taz** » Fri Jan 04, 2008 7:08 pm

Yeah mines been sucking through the diesel lately and has started smoking when the boots down. Think its the injectors so I'm going to sink some money into getting them sorted soon...ish.

gary_in_nz · Post by **gary_in_nz** » Fri Jan 04, 2008 7:08 pm

yeah i guess, but she has 216,000 kms...???

Jerry · Post by **Jerry** » Fri Jan 04, 2008 7:10 pm

from memory theres a emission thingy on the diesel pump? which clogs up and needs cleaning....

gary_in_nz · Post by **gary_in_nz** » Fri Jan 04, 2008 7:12 pm

alright might check that out

also i removed the precleaner box thing the other day to fit my snorkel. Do these precleaners actally do anything or are they there for show?? because it looks like a black box with 2x 3mm holes drilled in the inside, so i dont know what its supposed to clean??

taz01 · Post by **taz01** » Fri Jan 04, 2008 7:51 pm

just a quick cheap idea i find the odd oil and filter change helps my surf does it have any exhaust leaks that makes em chew fuel

gary_in_nz · Post by **gary_in_nz** » Fri Jan 04, 2008 7:56 pm

duno yet, better have a crawl under in some day light, but i dont think so... i shall see how i get on tomorrow

taz01 · Post by **taz01** » Fri Jan 04, 2008 7:59 pm

gary_in_nz wrote:duno yet, better have a crawl under in some day light, but i dont think so... i shall see how i get on tomorrow

just stuff a rag in the end while running and listen you should hear any then

DaveM · Post by **DaveM** » Fri Jan 04, 2008 8:32 pm

There is a small filter on some injector pumps which need cleaning, under the banjo bolt.

Nizsafari · Post by **Nizsafari** » Sat Jan 05, 2008 9:06 am

I only get about 500k out of a tankful aswell in my Safari, i guess sitting 3in higher on 35's doesnt help, a standard safari should get more than me!!

KiwiBacon · Post by **KiwiBacon** » Sat Jan 05, 2008 10:51 pm

How old is the air cleaner?

krawlr · Post by **krawlr** » Sat Jan 05, 2008 11:21 pm

inspect the screen in the fuel feed....

and mate dont forget they have those donks in nissan civilian campers!,a light duty truck engine is gona like the stuff....& youre combo is prob 2.5t laden...

gary_in_nz · Post by **gary_in_nz** » Sun Jan 06, 2008 10:49 am

yesterday i changed out the air cleaner and diesel filter. air cleaner was fairly bad and the diesel filter had this slimy gunk stuff in the bottom of it, i guess about a tea spoons worth, so shall see how far i can get now, it still blows a fair bit of smoke under load though.

GQTROL · Post by **GQTROL** » Sun Jan 06, 2008 6:46 pm

First step is replacing air-filter, followed by reco'd injectors and fuel pump.

Mileage per tank depends on how hard you push it. GQ's have two tank sizes...65L and 95L. I get about 7-800kms per tank from mine with 95L tank.

KiwiBacon · Post by **KiwiBacon** » Sun Jan 06, 2008 7:13 pm

gary_in_nz wrote:yesterday i changed out the air cleaner and diesel filter. air cleaner was fairly bad and the diesel filter had this slimy gunk stuff in the bottom of it, i guess about a tea spoons worth, so shall see how far i can get now, it still blows a fair bit of smoke under load though.

A non turbo will often blow some smoke under load. You can get the injection timing checked to minimize it and even get the pump turned down a little to stop it if you're worried.

Excessive black smoke is often a sign of not enough air, that's why the aircleaner is one of the first (and easiest) things to check.
The best fix for black smoke is to fit a turbo.

Clogged fuel filters will usually hurt power and performance rather than producing black smoke.

I got my Isuzu injectors redone recently after at least 100,000km of abuse (incl engine rebuild due to dust). The injector guy said one was okay, two were bad and one really bad.
The new injector tips made no noticable difference to power or economy, but did help starting.

Taz · Post by **Taz** » Tue Jan 08, 2008 5:36 pm

KiwiBacon wrote:
gary_in_nz wrote:yesterday i changed out the air cleaner and diesel filter. air cleaner was fairly bad and the diesel filter had this slimy gunk stuff in the bottom of it, i guess about a tea spoons worth, so shall see how far i can get now, it still blows a fair bit of smoke under load though.

A non turbo will often blow some smoke under load. You can get the injection timing checked to minimize it and even get the pump turned down a little to stop it if you're worried.

How much would you be looking at to get the timing sorted in a TD42 do you know?

KiwiBacon · Post by **KiwiBacon** » Tue Jan 08, 2008 7:35 pm

Taz wrote:How much would you be looking at to get the timing sorted in a TD42 do you know?

Sorry, no idea. Grab the Chch yellow pages and call around. Plenty of diesel tuning specialists there.

Taz · Post by **Taz** » Tue Jan 08, 2008 8:47 pm

KiwiBacon wrote:
Taz wrote:How much would you be looking at to get the timing sorted in a TD42 do you know?

Sorry, no idea. Grab the Chch yellow pages and call around. Plenty of diesel tuning specialists there.

Yeah, just hard to find a decent one. Cheers.

Shane · Post by **Shane** » Tue Jan 08, 2008 10:01 pm

gary_in_nz wrote:my 88 gq sucks through some diesel almost as bad as my landy, well mabey not that bad, but does use more than i would think it would.

its a standard GQ short wheel base, NON turbo 4.2 diesel, 5 speed manual, running standard size road tyres on it, 31's. I fill my tank and can't quite get 500 kms from it?? just wondering what everyone else experiances, and if there is anything to do to these that might help out a little.

I threw it on the weigh bridge at work today and it came in at a solid 2,300 kgs exactally with half tank of gas. I guess thats why they are the 'baby hippos'!!

what size tank has it got?how much to fill from empty?

MudBum · Post by **MudBum** » Tue Jan 15, 2008 6:44 am

Im the same as GQtrol,, bout 750-800 out of a tank..95l tank with a modded truck.My Saf never used to smoke much at all until Rick at 4wd Acc did a service for me and found the factory setting on the injector pump was very low.He tweaked and presto i've got a noticable power increase but also a bit of smoke under load..Good with the bad

gary_in_nz · Post by **gary_in_nz** » Tue Jan 15, 2008 7:41 pm

Shane wrote:
gary_in_nz wrote:my 88 gq sucks through some diesel almost as bad as my landy, well mabey not that bad, but does use more than i would think it would.

its a standard GQ short wheel base, NON turbo 4.2 diesel, 5 speed manual, running standard size road tyres on it, 31's. I fill my tank and can't quite get 500 kms from it?? just wondering what everyone else experiances, and if there is anything to do to these that might help out a little.

I threw it on the weigh bridge at work today and it came in at a solid 2,300 kgs exactally with half tank of gas. I guess thats why they are the 'baby hippos'!!

what size tank has it got?how much to fill from empty?

yeah mine deffinantly doesn't have the 95 litre tank, so i guess 65l then, maybe 500kms isnt too bad after all??

chewing the diesel

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