2003 GU Patrol 3L Losing Power

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Originally Posted by threedogs

you could have a leakying intercooler ,,,is it oily if yes and will need to be changed to
fully tigged and testetd one Diesel smart to a good 0ne dont go cross country for you
3ltr just a waste of monet IMO, Money could be well spent elsewhere like a front lokker maybe

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There is a bit of oil down the side of the engine, around the turbo. I think its coming from the oil switch.
The mechanic replaced the switch recently so i'm gonna get him to see whats happening there.

There also seems to be a bit of oil coming out of the catch can hoses.
I'm not really sure if or how that could affect the engine.

I don't see any oil or leaks from the intercooler, but i will definitely get the mechanic to have a look.

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Originally Posted by 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?

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

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Originally Posted by lmath56

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.

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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

Quote:

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Originally Posted by lmath56

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

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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

Quote:

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Originally Posted by JackCollo

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

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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

Quote:

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Originally Posted by JackCollo

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

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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.



Sent from my ONE A2005 using Tapatalk

Give the maf a clean and adjust your Dawes setting and you should be sweet

Disconnect the battery then service the MAF sensor with spray from Super cheap Auto.
re fit the MAF when its dry reconnect the start battery and see how you go.
You can test the IC by first removing it tape up the ends with duct tape use a bike
pipe and dip in a kiddies pool, Clean the inside with kero make sure its dry [hair dryer]
before reinstalling

On a total side note thank you threedogs for answering a question I had on how to clean intercooler. I was gonna use diesel? Is this a bad idea to use diesel only thought it would be good because if any is left over it will get burnt anyway but was told by someone else to use petrol which I know is an even worse idea.

I always use brake cleaner.
Swill that around for a bit and do that a couple of times.
Dries, evaporates a lot quicker, but as TD said....anything you use has to be totally bone dry before putting the IC back on.