td4 missfire !and smoking too !

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pudster

New Member
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hi, i hope there is someone out there who can help to point me in the right direction.
i have a 2001 td4 auto. it is usualy well loaded up and returns 30-32 mpg and when empty on a run returned 38mpg which i thought was about right. under light throttle and normal driving no smoke at all . when i put my foot down there is a cloud of grey smoke and then it is all ok again.
i have checked the intercooler hoses(all ok) replaced the engine breather filter and fitted an egr bypass.
the only other fault apart from the smoke is, after driving gently for a while if i come to a hill and ease my foot down it feels like it missfires almost as if the choke has been pulled on ! (i know it hasn`t got one but that is how it feels ) then a puff of smoke and it`s back to normal again.
sorry for long msg and look forward to any suggestions
thanks in advance
 
ok, thanks. i`ve been trawling through the old threads and now have a head full of stuff to check! with regards to the maf , if i dissconnect and i get no change that means its ok? and if it improves then the maf is faulty is that right?
can the boost solenoid be checked ?
thanks again.
 
pudster said:
ok, thanks. i`ve been trawling through the old threads and now have a head full of stuff to check! with regards to the maf , if i dissconnect and i get no change that means its ok? yes and if it improves then the maf is faulty is that right? yes
can the boost solenoid be checked ? to be 100% honest I'm not sure as I've never tried to check one.:eek:
thanks again.
Click to expand...

answers in red.;)
 
My TD4 was 'misfiring' and the fault was a knackered injector. Do check my other post regarding a great repair centre for injectors.
 
ok thanks. i`m going to do a few checks this weekend . i`m hoping it`s not injector problems!
 
hi. i`ve tried disconnecting the maf , didint seem to make much difference apart from it would cut out when driven hard. i`ve checked all the vacuum pipes that i could find ( all ok ). i removed and cleaned the sensor in the inlet manifold. still no change !
smoking when i put my foot down and missfiring at low revs ( not all the time ) i think the miss is at about 1800 revs.
any ideas ?
 
pudster said:
ok thanks. i`m going to do a few checks this weekend . i`m hoping it`s not injector problems!
Click to expand...

You could try doing a leak test on the injectors to confirm this.

I would be finding someone with a diagnostic computer though to try and eliminate the guesswork. The more plugs/connections you mess about with now the harder it'll be to find the fault as you'll be chucking up other faults too.
 
the missfire is still with me ! its an auto and when hitting a hill and just ease the accelerator down it missfires and i believe woulld continue to do so if i left it on light throttle but i dont like it doing it so i back off and then put my foot down and it clears.
the smoking problem is getting embarassing now, no smoke at all under general driving but when i floor it there is a slight delay then a BIG cloud of dirty smoke and off i go , if i keep my foot down there is no more smoke even when it changes to the next gear ?
help ?
 
hi ratty . sorry i hadn`t seen your reply . do you think that a diagnostic computer would pick it up ? i haven`t had any lights come on .
 
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