td4 misfire

Hi everyone. Great forum! very inforative

Wonder if you can help me with a fault i have on a friends freelander 04 td4. Ive had a search and cant really find the same problem i have.

He came to me last week, complaining of power loss and a pinking kind of noise on acceleration. I had a quick drive round the block and it appears to missfire on pull away. Other than that it seemed ok. I was a bit busy so i told him to bring it back to me after the weekend.

Well, over the weekend his wife was driving it and all of a sudden it started to smoke REAL bad. So bad she thought it was on fire and bailed out with all the kids lol!

I towed it to my workshop and discovered the turbo bearings had given up the ghost and dumped all the engine oil down the exhaust and some obviously into the inlet!

1 new turbo and complete exhaust later ( i tried to tip it out but it was absolutely jam packed and would of smoked forever!) and the smoking has stopped.

Ticking over it is fine but I still have a definate missfire on acceleration, and if i hold the revs at about 2500rpm. The miss goes on acceleration if i disconnect the maf sensor but is still there if i hold the revs up, but you can accelerate through it. No fault codes were on the ecu untill i diconnected the maf and the eml light was not illuminated. I have purchased a new maf but i appear to have been given a faulty one as it brings the maf code up when i connect it. Which the old one doesnt.

Today a new code is showing its face, intake air temp sensor which might be because it got covered in oil and i cleaned it with carb cleaner . Not too woried about this though.

Ill try the replacement maf tommorow when it turns up but does anybody have any other ideas?

I have also changed the fuel filter which looked origonal. The car has done 78000 miles.

Any tips would be very much appreciated.

Thanks guys (and gals!)

Ill also block off the egr in the morning and see if that helps at all.

Has the engine breather filter being replaced so far ???

Hi willo. Yeah, thats the first thing i changed when it come in as my land rover parts place recommended i change it.

After further searches ive heard the fuel pumps pack up on them and cause this missing at 2500rpm, i take it they mean the pre pump? I really hope the new maf sorts it as its going on forever and is coming to a small fortune lol

sorted it! yay!
Its an injector. I found number 2 wasnt doing anything when i pulled the connector off while it was missing, so i swapped number 2 with number 1 and the missfire followed it.
£270 plus vat! they take the **** dont they!
£600 for a turbo, £330 odd for an injector, £250 for a complete exhaust and a possible £170 for a maf (if i cant back it). Id better tell her to sit down before i give her the bill!

good motors aint they?

The Mad Hat Man said:

good motors aint they?

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BMW - quality German engineering..........

Have you actually had this done.. the injector? has it been replaced? Im just curious as my injector would not come out and this needed a new head so Im trying to gauge a service interval for when I need to take my injectors out and re-lube!

eightinavee said:

BMW - quality German engineering..........

Click to expand...

only thing thats gone wrong on mine is the bloomin engine!

Hi guys. Just to add a question on the subject. Friend of mine has a 56 plate with a missfire at about 1800rpm. No power loss, no unusual black smoke for a diesel and only occurs when your out of gear and hold the revs pretty much bang on 1800. Don't notice it when your driving and no warning lights. It is a bit nocky at idle, especially when cold but again not really out of the ordinary for a diesel of this milage, approx 80000. Its been serviced as per the intervals with genuine parts and ive told my mate to run a couple of bottles of diesel add throughout but it's still there. I'm guessing an injector goin experience with mercs (commercial). To be honest, I've told him not to worry about it, atleast for now as I said above you don't notice anything when normal driving. But he is insistent that it needs fixing now. It's his money I guess. Are the injectors a pain to remove? If I remove the plugs to find the bad one, will it put any faults up on the dash that I'll need diag equipment to get rid off? And I've heard from someone that the injectors need coding when theyre changed. Is this true? Thanks for any help.

Hello i have a td4 bmw engine 2.0 whit the same problems and now i solve the problem , the problem off the rpms 1800~2000 is the conector in the common rail sensor, this conector is damaged during years because the vibrations and vapor corrosining the conecxion check this ,cleam the conections whit a contact cleaner , re-close the contactors whit another fine tool and reconect. Wala problem dissapeared, this problem is because the intake absolute presure is fail because the ECU calculate this valor whit cammon rail presure sensor map presure and other values ,the gestion in this ecu is very bad and you don see the presure in the common rail , sorry for my englis i wait help for us