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[7builder]

My 2002 2.7 CRD Grand Cherokee has been suffering from leaking injector seals and the dreaded black death. Yesterday I removed the injectors and replaced the copper seals. The Jeep now runs a lot smoother and seems to have a little bit more oomph and the nasty smell of fumes no longer fills the cabin but it now belches massive amounts of black smoke. On idle there is a constant but gentle plume of smoke from the exhaust but as soon as you press the go pedal there is a massive amount of black smoke. I have never notice the car smoking before but now it is constant whilst driving or sat in traffic.
Nothing other than the seals were replaced and only the retaining bolts undone so does anyone know why this has started happening as it has got me stumped?

[Bulldog67]

embarrassing amounts or just smokey?

[7builder]

Massive amounts on a nuclear level. Off the scale. 

[Dave The Sparky]

embarrassing amounts or just smokey?

You pretending to know what you are talking about again? 

[Bulldog67]

yup

Mrs BD's shitheap done the same but im fucked if I can remember the diagnosis, however it was terminal and resulted after 6 months of tinkerin in the shitheap bein sold spares or repair

[Tank]

I always thought that black smoke on a diesel is usually unburnt fuel so i would maybe suggest new glow plugs and checking the air intake as a cheap first step,or another is timing on the fuel injector pump,which is a problem i had on an old isuzu astra

[7builder]

I always thought that black smoke on a diesel is usually unburnt fuel so i would maybe suggest new glow plugs and checking the air intake as a cheap first step,or another is timing on the fuel injector pump,which is a problem i had on an old isuzu astra

Cheers Tank but I dont understand how changing injector seals would end up causing this to occur. The wagon starts on the button in the morning so I think the glow plugs are ok. The smoke is still there when the engine is hot but I will check the air intake as you suggested and look to see if I disturbed any pipes or electrical connectors accidentally.

[Tank]

No idea,im not that technical but i would say its overfuelling somehow

[Dave69]

a CRD should use the glow plugs to start in this weather, they only work when the outside temp is -5 and below. have you an air leak somewhere in the system which might have been caused when everything was put back together. ECU reset might clear the issue, disconnect the battery for 5 mins+ then let the system relearn itself (suggestion only)


Dutch appears to be the expert on these mainly due to a practical repair history

[Panic mechanic!]

Black smoke is overfueling in a diesel and can be caused by many things from duff injectors to the pump  overfueling, I think you need to take it to someone who knows more about it.

[Jonny Jeep]

The only time we get black smoke out of all the plant we have at the airport is clogged air filters. Start simple/cheap.

[7builder]

I had a good look at it today and didn't find anything obvious. All the hoses seem to be intact, all electrical connections seem good and the air filter seems to be in good shape.
It started fine from cold this morning but I did notice that it is running a bit lumpy, nothing major but it is not as smooth as it was prior to changing the injector seals.

[Dutch]

I had a good look at it today and didn't find anything obvious. All the hoses seem to be intact, all electrical connections seem good and the air filter seems to be in good shape.
It started fine from cold this morning but I did notice that it is running a bit lumpy, nothing major but it is not as smooth as it was prior to changing the injector seals.

I notice in your OP that you have not replaced the stretch bolts.   These are one use only and need to be replaced by new when injectors are taken out.

You might still have sealing issues of some kind.

[7builder]

I didn't do injector 4 and 5 either because of the access issues. I am going to get my mechanic to drop the engine and do the lot - properly this time.

I'm off to the US with work on Tuesday for 2-3 weeks so he can look at it whilst Im away. I'll post here when I get back and let you know the outcome.

[daggie]

past experience also suggests it will need bleeding will bosch software which might explain why its running rough now 
why the fuck it needs plugging into a computer, to bleed it is 

[7builder]

Well the Jeep is being worked on at the moment whilst I'm away working in Arizona. The Jeeps here are amazing.I saw what looked like a LWB Wrangler in Tucson today that looked like it was on steroids, I wasn't able to get a close look at the model but it was no normal Wrangler. I am driving a Chevy Tahoe rental and I now realise how small my Grand Cherokee really is. Whenever I see one on the roads I can't believe how small it is compared to the other stuff people drive over here.

[7builder]

Just did a quick Google search and found the Wrangler. It was identical to this one including colour, wheels and tyres....
http://www.modifiedcars.com/pix/cars_high/25362_50422.jpg

[dieselj20]

Bosch injectors are coded to the ecu did you put them back in the same cylinders

[7builder]

Bosch injectors are coded to the ecu did you put them back in the same cylinders

Yes I did. Only one injector was removed at a time and put back before romoving the next.

[dieselj20]

most sprinters black smoke when they have an air leak on the pressure side of the turbo check for holes in pipes a pin size hole is usually enough has the control pipe for the turbo fell off