A paucity of power

[VladTepes]

The ute 300Tdi suddenly seems to be performing sub-optimally.

Accelerations is poor, and foot to the floor it takes a long time to get up to 100kph at which point it tops out - used to go a little bit quicker than that !


Anyone have any ideas as to what this could be / where I should start looking?

Could it be the accelerator cable?

Turbo hoses? (Although the top one is silicon. I assume the others are but didn't crawl under the ute to check in my office clothes).

Turbo?

Engine?


Please help. I hope to god this is an inexpensive fix because the wife is OVER it !

[SSmith]

Sounds like throttle cable.
To be sure take note of how far you have to move the pedal before anything happens. If its more than 1/4 of the pedal travel there is your culprit.
Or just look in the engine bay if there is a lot of slack in the cable it is fairly easy to see.

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[Brett1066]

If you don't have a boost gauge, see if you can get hold of one and check the boost on the turbo - mine normally peaks around 15-16psi

[VladTepes]

OK well the throttle works from the start so prob not the cable. Seems to rev ok in neutral just not under load.

?

[Blknight.aus]

stuck wastegate or blockage between the tank and the IP most typically the sedimentor or the filter, sometimes the pickup from the tank.

Once Ive seen it from a blocked tank vent

[rangieman]

Skipped timing belt maybe:cool:

[VladTepes]

Dave - presume you mean fuel tank. IP?

It didn't seem as bad this morning (though still there) so perhaps the fact this may be variable does point to a fuelling issue.

How would I check the waste gate?

[VladTepes]

Rangieman - don't say such things !

[rangieman]

Rangieman - don't say such things !

Sorry mate gone back to my hole:o

[SSmith]

Ok so now onto the boost pressure and give the fuel lines a blow back check your ic pipes, etc.

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[Blknight.aus]

Dave - presume you mean fuel tank. IP?

It didn't seem as bad this morning (though still there) so perhaps the fact this may be variable does point to a fuelling issue.

How would I check the waste gate?

btween the tank pick up and the injector pump you ccould have a blockage or leak.

the waste gate might be sticking wide open test it with compresed air on its feed line if it opens and closes its not stucked.

you might have a blockage or leak in the boost compensators sense line.

[VladTepes]

Great - I wish I understood that Dave !

[SSmith]

Find the small hose that comes off the aluminium side of the turbo. Disconnect it from the turbo and hook an air compressor to it. Pump 15 psi into the pipe, first listen for leaks. If it holds pressure then see if the wastegate arm (between turbo and engine block) moves when the pressure is released and re pressurised. Next with the air pressure at zero, remove the plastic air pipe from the back of the injector pump. Put air pressure into the pipe again, it should come out of the one you just disconnected from the injector pump.
See how that goes, then we translate the next test :p

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[Blknight.aus]

Find the small hose that comes off the aluminium side of the turbo. Disconnect it from the turbo and hook an air compressor to it. Pump 15 psi into the pipe, first listen for leaks. If it holds pressure then see if the wastegate arm (between turbo and engine block) moves when the pressure is released and re pressurised. Next with the air pressure at zero, remove the plastic air pipe from the back of the injector pump. Put air pressure into the pipe again, it should come out of the one you just disconnected from the injector pump.
See how that goes, then we translate the next test :p

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Almost but not quiet...

when you test the compensator and test from the turbo side take the line off on the turbo side of the engine not the injector pump side. If you test it at the injector pump your bypassing the pipe that runs from the turbo to the pump and thes sometimes rub though on the back of the donk.
its hihgly unlikely butif you still have the stock astegate/compensator plumbing it could also be a blockage at the front of the Tpiece.

[SSmith]

Almost but not quiet...

when you test the compensator and test from the turbo side take the line off on the turbo side of the engine not the injector pump side. If you test it at the injector pump your bypassing the pipe that runs from the turbo to the pump and thes sometimes rub though on the back of the donk.
its hihgly unlikely butif you still have the stock astegate/compensator plumbing it could also be a blockage at the front of the Tpiece.

That is what i intended. Poorly worded. My bad

Any luck, Vlad?

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