help needed please

i recently bought a diesel pajero 2.8tdi 93 model swb
its runnning very poorly as in, it wont rev cleanly, throwing out loads of what looks like unburned diesel smoke, stalling coming up to slow corners or junctions, (its an auto), it will re start but after a good bit of turning over and will continue to not rev cleanly past 3k and still throwing out unburned diesel smoke

i cleaned out the tank and the filter yoke attached to the fuel pick up pipe but i didnt clean out the fuel lines heading towards the engine, it ran fine for a day or two after doing this

what could it be


dave

 

I would go for the diesel pump TBH mate

 

How many miles has it done?

I would be tempted to take the injectors out and have them tested myself.

 

could be the injectors

 

I did a delica last week with almost the same problem as this has the same engine. It was the drive shaft bush and seals.

 

oh crikey dont say the fuel pump,

its done 80k miles, im just thinking here as i type but the presence of unburned fuel, wouldnt that say that fuel is getting thru but not burned??, that would say injectors alright wouldnt it, would the injectors be fooked or need cleaning

dave

 

drive shaft????

 

in the fuel pump

 

its a big problem with 2.5 and 2.8 mitsi dervs, a seal in the pump allows oil to enter the diesel chamber , if you can get the pump off yourself then i would hand it for the repair.
I would also consider getting an EGR blanking plate for it too as the EGR valve is prone to going tits up too usually resulting in the mother of all black smoke clouds following you wherever you go

 

Not familiar with this engine

BUT

Has it an air flow meter ? If so get it tested

Check air filter - maybe blocked

Check EGR valve and syatem

Is it a timing belt or timing chain ? May be slack therefore timing out of adjustment

Fit a new fuel filter

Just a few ideas and diesel pump is normally last resort after a few simple checks !!

 

sounds like the injectors to me mate

 

As mentioned twice, the pump is a weak spot, particularly on these engines causing exact symptoms

 

Well fookin shoot me me for typing my answer during your 2nd mentioning of the possible problem

 

and it has a rotory pump on it , why would it have an AFM

 

Which bit of HAS do you not understand ?

 

Had virtually exactly the same problem with one a while back at work, tried almost everything and thought the problem was with the egr, eventually found the timing belt had stretched and had thrown the pump timing all to fuck, new timing belt kit and jobs a good un

 

I agree

Sometimes the less than obvious fault can cause problems

99% of the time it may well be the same fault but sometimes a car can throw you a curve ball

Check a lot of things before you spend ANY money

You never know what you may find !!

I have previously worked in a main dealer as a service/bodyshop manager for too long (15 years) and have seen so many so called "experienced" mechanics relying on what they think the problem is that if they step back and look at the total picture then another solution could be the real cause.

 

Im only a Mercedes Master tech, also been a GM gold standard tech, but after 19 years doin this what experience is that

 

This one really confused me though as customer said the belt had been changed not that long ago so kind of threw me off from thinking it might have been timing related, was throwing out black smoke like a cunt but still had a good turn of speed about it !!! Only when i eventually stripped and checked the timing did i see the pump timing was about half a tooth out Really satisfying to cure it though as couple of other garages had tried and failed !!!

 

It counts for a lot

but you should NEVER rely on previous causes of faults every time

Use you skill and knowledge wisely and YES you may well be right 99/100 times but that 1 time may not cost you anything but your service manager will have to stand the refund to the customer should you get it wrong

I simply offered a number of "possibles" to D-Sport BEFORE he spent any money

 

absolutely! you can send everything away these days to be checked tho before buying new or having re-conned

 

I bet you are good at mental puzzles and crosswords etc

Am I right or wrong ?

 

No time for crosswords but usually quite good at them when i have the patience !!!


Like doing a job that gets me thinking though and find it really boring doing run of the mill repairs and serviceing, need a good job now and then that makes you take a step back, scratch the top of your bonce and think..... right you little cunt, what the fuck is wrong with you

 

You are like me then

Rather find a broken wire than replacing a perfectly good ecu !

Too may "mechanics" rely on their laptops and spreadsheets and flowcharts

GET BACK TO BASICS where fault finding is concerned it is so much easier

 

Its the injecters mate. Its a common problem with the 2.8 model.

 

Very true mate, cant beat starting with the basics rather than thinking..... it must be the ecu !!!!!

Wiring problems are prob my fav job and love tackling something that other garages wont touch as find it a challenge and then refuse to get beaten by it.

Have found more than one broken wire before when other folk have said its a 400 quid ecu thats at fault !! One of them even earned me a Ł50 tip from the onwner he was that chuffed i sorted his car for about a tenth of what he was told would cost him to sort !!!!

 

As the man in red would say

"Thats the way to do it !"

 

thanks guys, ill try the basics first and see what happens from there,

ill come back tomorrow after trying a few bits, thanks again

 

LOL at this thread...

As said its often the seal on the pump or the injectors

Diagnosis is to start with what you know, then consider what it might be.

Fault - cause - recitification



Alex

 

i was told that this type of engine has a chain rather than a belt?,

 

it does have a chain iirc

 

Well there was most definately a belt on the 2.8 one i did

 

hi guys
a few things i tried and noticed

i undid the fuel line which goes on to the fuel injector rail and fuel is coming out there but not at a very high rate, you might fill an egg cup every 6 or 8 seconds, is that strong enough???. i also filled some off this directly into a bottle and it looked dark enough to me, dirt perhaps???, im waiting unitil morn to get a ratchet type thing to take off the fuel filter to see if thats dirty but the cannister exterior looks new,

also it runs now for a second or two and revs free but then it sorts of trembles and blue smoke appears from the exhaust and then it starts dying, what does the blue smoke suggest

does any of the above help in any way or point out anything new

thanks again for all the help

 

finally sorted,
fuel filter full of shit
new filter on an its sweet as a nut,
thanks for all the help


dave

 

Pint of Guiness will do me nicely thanx

 

would you believe its started acting up again????, not as bad but still

there is air bubbles showing in the return pipe from the fuel filter to the injector pump???????????????????????????????????

 

and btw i hope to be collecting my cossie from pj motorsport in wolves next weekend, if your about pop over for your guinness