Offroad-Express

my 2.8 mu looses power, when i rev it jus sitting in the driveway it revs sweet at times then other times it jus starts coughing and the revs drop down and it almost stalls even wit my foot flat on the floor when it does it it wont rev over bout 2500 rpm. its only intermitten. it started doin it at the mac one day and it was a real slow drive home. i've looked for vac pipes split missing or fallen off and can see none. I'vecleaned my air cleaner and draned a small amount of water from fuel filter. anyone got any ideas as to wat it could be? i'm plannin on pulling fuel filter off tonight.
cheers

dodgy air flow meter? water maybe. could be many things but same symptoms as my previous surf, wouldnt idle or rev over 2000rpm, just a thought

does it smoke while its doing it?
Check the engine warm up valve just below the turbo isn't closing by itself, I have seen a couple of 2.8's do that. If it is just take it off and cut the butterfly out

Does it have a throttle position sensor? When mine was faulty it did the same thing

my accelerater cable goes strait to injector pump. has no air flow meter its desiel. doesn't seem to smoke wen it does this,well i dont think it does . runnin outta ideas

sounds a lot like the same problem i had with pajero.
air leak on the prussure side of the deseil pump. mine was in the injector line.

I had this problem on my Bighorn and is was because the fuel filter was blocked

This is worth checking - I have removed mine

Jezza wrote:does it smoke while its doing it?
Check the engine warm up valve just below the turbo isn't closing by itself, I have seen a couple of 2.8's do that. If it is just take it off and cut the butterfly out

I vote fuel problem too. How'd the filter look?

Not familiar with the MU at all but symptoms sound a lot like the blocked fuel uptake filter inside the fuel tank on my truck. Blocked up real bad and owing to all the crap in the tank simply blowing through the fuel line was only a temp fix. Problem solved with removal of the said filter and placement of an inline filter of same dimensions and flow characteristics outside the tank for ease of cleaning. I also added a sedimentor for good measure before the main fuel filter.

I run an LD28 and these have a vane pump in the injector pump to pull the fuel. While the in-tank filter was blocked the vacuum in the fuel line was running at up to 23" hg (inches of mercury) and it was pulling air into the fuel line at whatever point it was able to... Now I have corrected the problem, I run at 4" hg at wide open throttle under load.

thanks for the input guys. havent removed filter yet thats are work in progress. does anyone know if the mu will have a filter in the tank?

I think they have a gauze on the end of the pick up pipe

sweet as. cheers jeeza. can you actually see the exhaust flap thingy openin and closin as the truck is runnin

well i have a update. i have the diesel bug. removed my fuel filter today and tiped it upside down into a container and black slimey slugde slopped out. i didt know diesel was yellow??

Bugger! Best bit of advice I had when in a similar situation was to go to a dedicated truck place that services the transport industry and buy just a algaecide. I got a product that was just a checmical to kill this stuff, not increase power, not clean this that or the other, just kill diesel bug pure and simple.

my mates brother in law sells a inline filter looking contraption wit magnets in it that kill the diesel bug. He sells them thru nz and aust to long haul truck companys to stop diesel bug. So he wants me to use one and see how it goes on my truck and if there is a market for us off roaders. i'm interested in seeing how it works out and if it keeps it away and if there any increase in power and efficiency. so if anyone keen to find out more info let me know and want to know how i get on.

mud_slinger wrote:well i have a update. i have the diesel bug. removed my fuel filter today and tiped it upside down into a container and black slimey slugde slopped out. i didt know diesel was yellow??

Your post reminded me I took some of my suspect diesel out before adding algaecide and put it in with some clean stuff to sit a while to see if I could 'grow' the stuff and to see what it looked like. I just went back to find the container and it hasn't grown anything whick makes me wonder whether I had it in the first place.

Wanna try and grow some of your black stuff? Might just be sludge as I was of the understanding that algae in diesel goes pale creamy white jelly like tendrils somewhat like a jellyfish. Could be wrong on that but several folk have described it to me like that.

mabe its not diesel bug but wat eva it is its bad and fully clogged my fiter. according to my mates bro in law its the bug.maybe down here its a diff strain of the bug. Maybe its mutated and adapted to our climate

mud_slinger wrote:mabe its not diesel bug but wat eva it is its bad and fully clogged my fiter. according to my mates bro in law its the bug.maybe down here its a diff strain of the bug. Maybe its mutated and adapted to our climate

Could well be. I assume the filter you speak of is the main fuel filter and not the one in your tank if you have one. Whats the inside of your fuel tank like? Had a look and flushed it?

yea its the main filter, only got the one. not sure if want to drain whole tank got like half a tank in there. thats a lot to drain out. where do you buy the treatment stuff for it?

If you've found sludge in your filter it most likely came from the tank in origin. It is well worth draining it to see what kind of crud is in there. I was blown out (read gobsmacked ) when I looked at mine. Really hit home to me how dirty diesel is when we buy it and just how much stuff accumulates. Diesel isn't as volitile as petrol so when I cleaned my tank I bought four 10 litre buckets cheap. Drained into them and cleaned the tank and then filtered the bucketed diesel back into the tank using a siphon with an in line filter on it. Took a while but at least i know the state of the tank now. Not spotless, but not filthy either...

Well worth considering...