1HD tojo crap performance

[Disco Muppet]

Howdy.
Let me stop you before you start, no 'it's a Toyota they're all crap' comments please :p
We have a pair of 1HD tojo utes at work, in addition to our 3 1VD V8s.
One of the 1HDs is fine, pulls like a train, loaded or unloaded.
The other is fine empty but once you put a load on it it's a slug. I towed 50 bales of straw in a box trailer today and I was down to third gear up minor hills trying to maintain 70kmh and failing, the other 1HD charges up hills in 5th gear with trailers full of drill core and scrap metal, much heavier than today's load. Even unloaded with just the trailer it was noticeably bad.
Vehicle is serviced every 5-8k kms, well maintained, and has at some point had a top end rebuild. 276k on the odo.
Suggestions please :)
Cheers
Muppet

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[MR LR]

Should be replaced with a 300tdi auto.

The be-all and end-all of tow vehicles.

[rangieman]

Should be replaced with a 300tdi auto.

The be-all and end-all of tow vehicles.

Mmmm i smell at rat in that hole:wasntme::angel::p

[p38arover]

Partially blocked exhaust?

Needs a high speed highway run?

[Beery]

Im just going to spit out some ideas without knowing what you've already checked..
Air filter, air hose (collapsing), fuel filter, fuel strainer in tank, compression, dragging handbrake/footbrakes, injector pump inlet strainer, exhaust blockage.

[justinc]

Egr valve stuck open is my best guess. They can also go into limp mode with overboost due to wastegate actuator pipe splitting. Have you put a boost gauge on it? And how many kms since it had a set of injectors? It is also possible to mistime them has it had a timing belt recently? These are a great engine it should pull well .

Jc

[steane]

Make sure you get the keys for the good one ;)

[Beery]

Ahh of course, EGR valve. I was thinking of a 1hz before for some reason.

[loanrangie]

Mmmm i smell at rat in that hole:wasntme::angel::p

Some one let the work experience kid at the computer again.

[cafe latte]

Im just going to spit out some ideas without knowing what you've already checked..
Air filter, air hose (collapsing), fuel filter, fuel strainer in tank, compression, dragging handbrake/footbrakes, injector pump inlet strainer, exhaust blockage.

Fore sure check the strainer it is in the fuel in or out pipe cant remember which, remove the banjo and you will find it. I have seen them full of crud, car works, but sllowww.
Chris

[B92 8NW]

Maybe someone swapped it for a 1HZ when no one was looking.
But then, I've just gone from a 300Tdi auto to a 1HZ and couldn't be happier:D

Second all the basics mentioned above, nothing goes wrong with Tojo diesel sixes, but maybe look at tappet adjustment. Often overlooked as is it time consuming on a 24 valve engine...

[Disco Muppet]

My understanding is it's carried across a service or two but I'll confirm that on Wednesday when I get back.
It's has 'something' replaced for being down on power a month or so ago, my boss said something 'like a regulator'.
It spends plenty of time on the highway, I don't baby any of the vehicles as company policy is to idle the vehicles to warm them up, which is not an ideal practice. They also spend lots of time towing.
Its had issues since as long as I can remember, had another worker come in asking if it was usually bad on fuel or down on power, suspecting crap fuel.
When I first started I was told it had never been right after the top end rebuild.
I'll have a look at it if I get a chance, it may be the vehicle going in for a service on Wednesday but either way I'll check out what it's had done and when.

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[strangy]

Disregard- confusion on my part with 1HZ and 1HD

[Toxic_Avenger]

Give it an Italian Tune up.

[alien]

Fore sure check the strainer it is in the fuel in or out pipe cant remember which, remove the banjo and you will find it. I have seen them full of crud, car works, but sllowww.
Chris
I was thinking the same thing.
I've cleaned gauze filters in the fuel banjo's for the supply line into the lift pump on older diesels.

PS after another read of OP.
If it's only done it since the head was off get the cam/crank/fuel pump timing checked.

[Disco Muppet]

Comments about highway runs, Italian tune ups....
When I said I don't baby it... :angel: :angel:

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[Svengali0]

My understanding is it's carried across a service or two but I'll confirm that on Wednesday when I get back.
It's has 'something' replaced for being down on power a month or so ago, my boss said something 'like a regulator'.
It spends plenty of time on the highway, I don't baby any of the vehicles as company policy is to idle the vehicles to warm them up, which is not an ideal practice. They also spend lots of time towing.
Its had issues since as long as I can remember, had another worker come in asking if it was usually bad on fuel or down on power, suspecting crap fuel.
When I first started I was told it had never been right after the top end rebuild.
I'll have a look at it if I get a chance, it may be the vehicle going in for a service on Wednesday but either way I'll check out what it's had done and when.

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Valve Timing perhaps.
Its common rail I'm guessing -so injection timing is electronic.

[Disco Muppet]

The 1HD isn't common rail I don't think, direct injection

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[justinc]

These have electronic injection pumps and yes they can be mistimedd during belt fitting. Also can suffer from advance problems within the pump so don't rule that out... if it has had a set of injectors then they would want to have been genuine toyota not reco ones... they are very particular.

Jc

[Disco Muppet]

Just been told I have to go and collect it from the mechanics.
An update on previous info.
It HAS had a set of injectors, quality unknown without digging out receipts.
The last time it went in it was a stuck open EGR.
It HAS had the head off.
Diagnosis from the mechanic?
'leaving the hubs in onroad, increasing resistance'
:rolleyes: bull**** if you ask me, all the other vehicles run with the hubs in essentially all the time and they're fine.
I guess we'll see.
I won't be taking my car to the mechanic we use...

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[Disco Muppet]

Well it's quicker off the line with the hubs out.
That's about it.
Biggest hill I could find, foot flat in 4th gear holding 80 up and that was giving it everything.
Perhaps I'm expecting too much, but for a 4.2L turbo diesel 6 I think that's crap.
Interestingly, the trailer with the straw is hooked up to the other 1hd we have, and the difference between the two just reversing the trailer around is noticeable...

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[bsperka]

On the older models looking at / moding the injector pump let the horses loose. This may be an issue with yours? Don't know the 1HD engine injector system, so may be barking up the wrong tree with this.

[justinc]

On the older models looking at / moding the injector pump let the horses loose. This may be an issue with yours? Don't know the 1HD engine injector system, so may be barking up the wrong tree with this.

All electronic...

jC

[roverrescue]

You need to take it down to JC a 1hdfte master ;)

A quick ten minute diagnostic with long term improvement would be to throw a blanking plate into the EGR pipe. Won't throw codes on the 1hd and will definitively block the soot maker?

S

[justinc]

You need to take it down to JC a 1hdfte master

S

😮😮what the??? 😄

[justinc]

You need to talk to this guy...

GTurbo (http://gturbo.com.au/)

Jc

[Disco Muppet]

Nah, I just downshift and put my foot through the firewall :D
It seems a bit better having just been serviced. Although going from my heavily chipped and intercooled td5 into these, even the V8s seem crap with a load on them, especially off boost which is disappointing for a 4.5L TDV8, plus they smoke like no-ones business

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