Outer Limits 4x4 Board

Have a 4.2td gu 2000, has 3inch dunp + exhaust,k/n air filter new fuel filters. It just hesitates when accelerating. goes good to about 2000 rpm then holds back then goes good to about 3000 rpm then holds back then goes ok to about 4500rpm. Can anyone tell me a good diesel mechanic up south in Adelaide?

WHY would you rev a TD42T to 4500rpm???????????? It does nothing more for it after about 3300-3500rpm

I have gone from petrol cars to petrol 4x4 to 4.2 diesel gu (first diesel) because always towing about 1.5 to 2.5 tonne, maybe im asking to much from the patrol. IT mite just be me?

u kidding me? GU 4.2d has got some guts behind it
strong motor

could be just the driver use to faster petrol 4by? and
could need a timing/service done to it

Direct Automotive just off Sherrifs Rd. on the service road near the expressway exit.
They also do LPG fumigation for all diesels too.

4500rpm

Check the torque curve on it man...........you're getting good torque @ 2000rpm. Maybe 2500rpm giving it a bit off at the lights 3000rpm in 1st/2nd low up a hill or in deep sand but 4500rpm

I've NEVER revved my TD42 (n.a.) past 3500rpm and that was a boo boo. usually it goes no further than 3000rpm.

Its not a petrol. The reason you bought a diesel is stump pulling torque LOW in the rev range. The people behind you must love the black smoke


Regards

no smoke, had my son drive behind me Even with foot flat to floor no smoke. I don't understand why theres none.

BIG GQ wrote:WHY would you rev a TD42T to 4500rpm???????????? It does nothing more for it after about 3300-3500rpm

why not? .... my TD42T pulls all the way to 5k all useable power

numbnuts wrote:Have a 4.2td gu 2000, has 3inch dunp + exhaust,k/n air filter new fuel filters. It just hesitates when accelerating. goes good to about 2000 rpm then holds back then goes good to about 3000 rpm then holds back then goes ok to about 4500rpm. Can anyone tell me a good diesel mechanic up south in Adelaide?

i think you can buy an upgrade kit for that model the intercooler is the same as the 2.8 i believe.

Hoonz wrote:

BIG GQ wrote:WHY would you rev a TD42T to 4500rpm???????????? It does nothing more for it after about 3300-3500rpm

why not? .... my TD42T pulls all the way to 5k all useable power

Because more revs doesn't necesserily make more power, not past 3300 - 3500rpm, depending on how its set up. Yours might have power all tha way to 5k buts its not a stock motor is it?

no its not a stock motor :p

Up to a useable 3000 to 3500 it should pull smoothly. Check fuel filter can keep up. Change that and air filter .

Bazzle

bigbluemav wrote:I've NEVER revved my TD42 (n.a.) past 3500rpm and that was a boo boo. usually it goes no further than 3000rpm.

same, I dont see any point to it!

boring old farts
no really my wagon rarely sees 3500 DD application

numbnuts wrote: Can anyone tell me a good diesel mechanic up south in Adelaide?

There's a place in Regency Park (not south of the city I know....) that the inlaws had their GQ 4.2 turbo diesel fixed at about a year ago. They were very happy with the service (full pump rebuild due to it leaking everywhere.) If you want I can get the name.

Could be a fracture in the pump housing as ive got that problem now and in a certain rev (not all the same) it will sortove like chock then power on again.

And hoonz how do you rev it to that ? I thought all deisels have a guverna in the pump or have you removed this?
Governed to about 4400/4600 i think

you won't get a stock engine to rev to 5000 multipul mods

and yes mine is capable of over revving and destroying itself

i agree with hoonz, and to everyone that asks why rev it to 5000.....cause he can!!!



but it sounds like a fuel problem to me, or the waste gate isnt functioning properly. had the same problem with my surf.


NICK

Just come in from work, thanks for reply.
I don't drive it up to 4500 rpm, i just tried it the other day to see how it pulled trying to sort out this problem.
I have replaced the fuel filter and the air filter but didnt change a thing.
if it was a petrol i would say it had all the signs of plugs breaking down under load or water shorting out the leads.

bogged wrote:

bigbluemav wrote:I've NEVER revved my TD42 (n.a.) past 3500rpm and that was a boo boo. usually it goes no further than 3000rpm.

same, I dont see any point to it!

You live and drive in Vic and you still don't see any point to revs, sometimes 5000 rpm is the only thing that will get you up those long slippery clay hills............

Juzza wrote:

bogged wrote:

bigbluemav wrote:I've NEVER revved my TD42 (n.a.) past 3500rpm and that was a boo boo. usually it goes no further than 3000rpm.

same, I dont see any point to it!

You live and drive in Vic and you still don't see any point to revs, sometimes 5000 rpm is the only thing that will get you up those long slippery clay hills............

5000rpm = momentum

mass + velocity = momentum

We used to have one of these at work ,when ever we fuel up with Ampol Diesel it would clog up the little guaze filter on the pump itself.Maybe worth having a look see how this filter is

You could try using a inline helper pump, mine runs a 80 gallon an hour pump to feed to injector pump. Cause the injector pump could not get enough fuel. Also help starting on the side of hills

Just find a low pressure pump say 5-6 psi. Like a Holley Red Pump etc.

Mine was doing to same until I fitted my helper pump.

Cheers Heath

Hoonz wrote:mass + velocity = momentum

mass x velocity = momentum

NJ SWB wrote:

Hoonz wrote:mass + velocity = momentum

mass x velocity = momentum

same shit different shape

its funny you say about the extra pump heathgu, i have a sloping driveway and if i park facing up hill it hard to start in the morning but face the other way and no problems. I will try the pump tomorrow and let you know thanks.

tried the pump, nothing changed. I am off to graham west performance Thursday for a dyno.

mate my old man had the same year model in a wagon, same engine same problem, took it to every deisel mechanic that was recomaned, and not one could get it going probly, only had 30,000 on it when he sold, took it to well known people to like berima, nissan just scrated there heads, so they were no use, we put it down to being a dud! we both have 05 model gu utes know, that have pulling power from the word go with no hesitation at all. ive heard of this same problem from other people too, i think theres a bad batch from that model.