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(Post Link) post #1 of 28 Old 17-02-16 Thread Starter
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Smoking Heavily under acceleration

hi all, only just joined and have done a search briefly but no really sure if the threads apply..

anyhow. I have a 20V JTD 156 seems to run fine cruising >70mph but a couple of things happen if i either accelerate hard or go above 70mph

There is a rather large plume of smoke left behind the car...it accelerates well (I think...I've only owned it a few days) but sometimes the engine almost seems as if it's slightly unbalanced now i think the "unbalanced" feeling kinda seems like a driveshaft but can't be 100% on that and will investigate further when i can get it on a ramp.

but the smoke is bothering me, I've read countless threads all over the net saying about a blocked EGR's can 'cause this but also goes on to mention poor performance and economy, well to date it seems nippy enough and today on £30 of fuel its managed around 320miles and still not hit reserve yet.

I'm sorry if this has been covered before..
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(Post Link) post #2 of 28 Old 18-02-16 Thread Starter
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any thoughts on this?
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Likely to be either stuck EGR or split bottom turbo hose.
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(Post Link) post #4 of 28 Old 18-02-16 Thread Starter
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super thank you
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Unbalanced fee might be worn suspension arms or dodgy cheap/worn tyres ..
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(Post Link) post #6 of 28 Old 18-02-16 Thread Starter
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ill check that out too.

thanks for all the responses
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Cat and egr should be checked. I don't know if it has dpf, but if it has one it should too.

Is there any over consumption symptoms?
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(Post Link) post #8 of 28 Old 19-02-16 Thread Starter
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Originally Posted by yondaime View Post
Cat and egr should be checked. I don't know if it has dpf, but if it has one it should too.

Is there any over consumption symptoms?

I'm going to check the EGR this weekend, as for consumption no its actually fairly good on fuel ±49mpg so I'm not sure its a boost leak of any description
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Probably egr then. Hope it's not something big.
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Quote:
Originally Posted by DatsunUK View Post
I'm going to check the EGR this weekend, as for consumption no its actually fairly good on fuel ±49mpg so I'm not sure its a boost leak of any description
Is that what the dashboard is telling you, or what fuel receipts and odometer readings are telling you?

My dash computer reports around 60 mpg usually, but fuel receipts and odo readings work out closer to 50 mpg...
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(Post Link) post #11 of 28 Old 19-02-16 Thread Starter
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Is that what the dashboard is telling you, or what fuel receipts and odometer readings are telling you?

My dash computer reports around 60 mpg usually, but fuel receipts and odo readings work out closer to 50 mpg...
no thats real world figures, £30 in (on two occasions..only owned the car a week) in region of 320 miles out to empty
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yeah sounds like egr. my sportwagon did this so i cleaned egr and changed turbo hose (it was top one, the split was barely visible) and it cured it until cambelt snapped on boxing day
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It could be that the car has previously been remapped and the map is fuel heavy.
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(Post Link) post #14 of 28 Old 19-02-16 Thread Starter
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no it hasn't been remapped, the previous owner (1st owner) is a 70yr old man who's a friend of the family, trust me it wouldn't have been remapped.

and to be honest the next remap up from this would give it approx 200bhp± and its not that fast
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I know what a map does on the 2.4 156 - I've had one. When you have it running properly get it mapped. It is THE best money you will spend on this car!!!!!

Don't plan to unblock the EGR blank it.
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(Post Link) post #16 of 28 Old 19-02-16 Thread Starter
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Originally Posted by kandlbarrett View Post
I know what a map does on the 2.4 156 - I've had one. When you have it running properly get it mapped. It is THE best money you will spend on this car!!!!!

Don't plan to unblock the EGR blank it.
a very close friend can do a flash for me however i have resisted on this car and the previous (Focus TDCI) because its a daily workhorse, i waft along around 65-70mph on motorways (I do circa 50-60k a year) for performance i also have a 200SX with far too much power for the grin factor if i need it.

so while i get remapping is a way for forwards I'm not really looking to increase the performance/economy of this car as reliability is more important.

as for blanking off I did see about this and not really paying too much attention but saw there are two different routes...one plate with holes and one without to be honest at that point i got distracted by something else no doubt and didn't investigate further, i think the mention of EML/error codes meant i didn't look further
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By the way if nothing happens with egr or dpf. Check injectors too at a specialist.
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(Post Link) post #18 of 28 Old 20-02-16 Thread Starter
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By the way if nothing happens with egr or dpf. Check injectors too at a specialist.
Yeah the injectors did cross my mind although on anything other that giving it a welly there doesn't seem to be much if any soot at all
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Quote:
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By the way if nothing happens with egr or dpf. Check injectors too at a specialist.
No DPF on a 156.
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Mine had this problem, almost fixed after cleaning the egr, althought I blanked it in the end. Also the EGR body was slightly loosen in the inlet manifold, allowing some leak.
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(Post Link) post #21 of 28 Old 24-02-16 Thread Starter
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I will eventually get around to looking at the EGR to be honest the bloody great big vibration thats its got has priority now
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Vibrations usually are injectors or DMF. Check injector's correction wih a diagnosic cable.
I have a bit too, I have 2 injectors with a correction of ~2, which is pretty much high.
Planning to put pure LiquiMoly Diesel Purge soon, I hope it does something!
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(Post Link) post #23 of 28 Old 25-02-16 Thread Starter
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I've got a mate who confirmed my suspicions, it appears to be drive shaft/s so he's ordering some up over the next day or so.

he did initially think DMF but once he drove it and listened to it he reckons its the shafts
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I thought it made vibrations by only having the engine on...not only driving.
Well, at least is not so expensive as the flywheel, and much easier..
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(Post Link) post #25 of 28 Old 26-02-16 Thread Starter
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I thought it made vibrations by only having the engine on...not only driving.
Well, at least is not so expensive as the flywheel, and much easier..
no at idle its totally fine, and revving engine at idle its fine too, and gently driving its fine too its only when accelerating heavily the vibration is felt, my mate (who's a mechanic ) heard the shafts lightly clicking on full lock and is convinced its shafts
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