2003 GU Patrol 3L Losing Power

[lmath56]

Hi,

I have a 2003 GU Patrol 3L Diesel,
About a week ago when I was driving, I turned a corner and accelerated off,
When I was in 4th or 5th gear and was at about 2500 RPM, it seemed to lose pulling power.

I put the clutch in and revved it a bit and it seemed fine, I drove around for a while and all seemed good, but then it happened again.
I didn't notice it again for about another week, when it happened while just accelerating up a road.
I haven't noticed it since.

On all cases I wasn't accelerating hard.

My Patrol has a Dawes valve set to 15 PSI.
The engine was reconditioned about a year and a half ago and had a new fuel pump installed.

Does any one have any idea what could cause this?

Thanks,

Lucas

[Softy]

How much fuel was in the tank at the time?

[lmath56]

How much fuel was in the tank at the time?

There was plenty of fuel in the car every time it happened.

I replaced the air filter today and found that the old was really dirty,
I went for a 5 hr drive tonight and it is definitely still happening.

I was pulling a small trailer with nothing in it and it usually drove fine, but sometimes it decided that it wasn't going to go faster than 90 and the exhaust temp started to go up.
I didn't let it get over 400 degrees.

[JackCollo]

There was plenty of fuel in the car every time it happened.

I replaced the air filter today and found that the old was really dirty,
I went for a 5 hr drive tonight and it is definitely still happening.

I was pulling a small trailer with nothing in it and it usually drove fine, but sometimes it decided that it wasn't going to go faster than 90 and the exhaust temp started to go up.
I didn't let it get over 400 degrees.

what temp did it go from and to. how quickly did it go up?
so the temp shot up when it lost power??
starting to sound like a dirty MAF duck down to supercheap grab a can of mass airflow sensor cleaner. pull the maff off and the pipe that goes from the top of the airbox that the maf is apart of and give a darn good spray down from as many angle.
cheers

[lmath56]

what temp did it go from and to. how quickly did it go up?
so the temp shot up when it lost power??
starting to sound like a dirty MAF duck down to supercheap grab a can of mass airflow sensor cleaner. pull the maff off and the pipe that goes from the top of the airbox that the maf is apart of and give a darn good spray down from as many angle.
cheers

It didn't go up too fast, I didn't strain it.
I got it to about 400 Max.
Yes when it lost power it seemed to get a bit warmer than usual.

I will definitely give the MAF a clean

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[threedogs]

It didn't go up too fast, I didn't strain it.
I got it to about 400 Max.
Yes when it lost power it seemed to get a bit warmer than usual.

I will definitely give the MAF a clean

Sent from my ONE A2005 using Tapatalk

Disconnect the battery when you clean the MAF
will re-set the ECU, Check vacume hoses for cracks etc
make sure they are in good nick

[JackCollo]

It's sounds it could be going into limp mode. With your Dawes valve set to 15 psi it could have just slipped over into lump mode. Did any lights on the dash board come on or not

Any change in fuel economy?

[lmath56]

It's sounds it could be going into limp mode. With your Dawes valve set to 15 psi it could have just slipped over into lump mode. Did any lights on the dash board come on or not

Any change in fuel economy?

What is limp mode? Does it signify something bad?
No lights on the dash at all.

[JackCollo]

What is limp mode? Does it signify something bad?
No lights on the dash at all.

Alright so basically on your intercooler you have a pressure sensor which is set to 16psi so when the turbo spools up and creates pressure if it goes past 16psi it limits power which explains the sudden power loss. and the way to take the ecm out of limp mode you realease throttle and engage it again.

it wont set off any lights
So in summary limp mode is designed to stop the engine doing damage to itself in the form of over pressuring and blowing gaskets and such other. Ive noticed a lot of the earlier patrol if people keep their foot on the accelerator in limp mode the temps do go up but then drop after throttle released. temps go up due to slight over fueling

[lmath56]

Alright so basically on your intercooler you have a pressure sensor which is set to 16psi so when the turbo spools up and creates pressure if it goes past 16psi it limits power which explains the sudden power loss. and the way to take the ecm out of limp mode you realease throttle and engage it again.

it wont set off any lights
So in summary limp mode is designed to stop the engine doing damage to itself in the form of over pressuring and blowing gaskets and such other. Ive noticed a lot of the earlier patrol if people keep their foot on the accelerator in limp mode the temps do go up but then drop after throttle released. temps go up due to slight over fueling

Ah ok, so the Dawes setting may have changed a bit and it needs to be adjusted back to 15.

I will change that and see what happens.



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