tonyt37 · Jan 2, 2015

Hi Guys

I have just spent about an hour searching and reading up on this but don't seem to get a definitive answer. My TD4 splutters and smokes (white smoke) between 2000 and 2100rpm. The rest of the time it starts and drives fine. I had a diagnostic and no faults are showing. I have read a few very long threads. The best info I can come up with from the threads is replace the wiring harness to the fuel pressure sensor? Has this cured the problem for anybody else?

Thanks for your help.

Tony

Epicuser · Jan 3, 2015

It could be several things. The fuel/sensor harness could be one of them. Injectors could be another. Low pressure fuel pump starting to give up could be another.

tonyt37 · Jan 3, 2015

Thanks for the reply epi. I think I'll start with injector cleaner. it had a new LP pump about 2 years ago and the HP pump this year. I also changed the MAP sensor a few months ago.

GMC85 · Jan 5, 2015

Mine has the same issue. But much worse. Is the fuel pressure sensor. Hopefully getting it sorted this week.

tonyt37 · Jan 5, 2015

HI GMC. Let me know how you get on.

tonyt37 · Jan 11, 2015

Anybody else any ideas?

tonyt37 · Jan 31, 2015

Anybody any more thoughts?

Dippypud · Jan 31, 2015

Disconnect the MAF and see what happens ...

When was it last serviced?

Have you tried injector cleaner or a couple of litres of cooking oil run through ?

Dippypud · Jan 31, 2015

tonyt37 said:
Anybody any more thoughts?

Your TD4 rough running is most likely a dirty injector, you can prove this by running the engine at tickover and unplugging the injectors each in turn, the one that has little effect is the one with the problem, its easy to check ...

malory16 · Jan 31, 2015

Hi i have the exact same problem... i did a leak test and showed that injector 3 is returning a lot more fuel than the others, i tried disconnecting it but the smoke is still there at 2000 rpm... The fuel sensor harness is damaged too ... I should start with the harness as it is a cheap fix.
cheers

tonyt37 · Jan 31, 2015

Hi Dippy. It runs fine on tickover and perfectly smooth up to 2000rpm and under load all the way. Its when it's not pulling the problem starts. Tried injector cleaner. Serviced about 2 weeks ago inc breather's.

Malory, think i'll start with checking the wiring. The harness mod is about £40 I think. I'll try that first then the sensor. I have pm'd somebody who had exactly the same to see if he managed to cure it but he hasn't posted for a bit. that may be good news!

malory16 · Feb 2, 2015

Bad news... Seems like it's an injector issue for sure

dont remember how many times now i've changed faulty ones... tho it's 300k km now

edit: will post back if problem solved...
@tony: have you done a leak back injector test?

malory16 · Feb 22, 2015

Hi all ,
finally problem solved it was the turbo solenoid.
the smell of unburnt gas is caused by a lack of air.
thx

gstuart · Feb 23, 2015

sorry to side track but how much have u guys paid for ur injectors please

assume they were on a reconditioned basis

is £100 each about right plse

thks guys

fredi250 · Feb 24, 2015

Bosch recon units with 2 year guarantee 110 plus 30 back exchange when you send old injectors back local Bosch franchise

tonyt37 · Apr 16, 2015

Well I got a 2nd hand Turbo Solenoid from ebay and a bottle of injector cleaner. Bingo!!! Sweet as a nut. Not sure which cured it but it's fixed

for now anyway. I sat with my foot on the accelerator ar 2000rpm for 5 mins and it didn't miss a beat. Cost to fix £22.

teddywood1 · Apr 16, 2015

was that the turbo vacuum solenoid with the 3 or 2 pipes on?

tonyt37 · Apr 17, 2015

The one with 3 pipes on it.

redwood · Jan 9, 2016

I'll tell my mate today as he has spent hundreds of pounds trying to sort the same problem out

Damian Brewster · Feb 7, 2016

malory16 said:
Hi all ,
finally problem solved it was the turbo solenoid.
the smell of unburnt gas is caused by a lack of air.
thx

tonyt37 said:
Well I got a 2nd hand Turbo Solenoid from ebay and a bottle of injector cleaner. Bingo!!! Sweet as a nut. Not sure which cured it but it's fixed for now anyway. I sat with my foot on the accelerator ar 2000rpm for 5 mins and it didn't miss a beat. Cost to fix £22.

Evening all, long time coming this post but ive been working my way through along list of trying to eliminate the lumpy/smoking symptoms you both had at 2000 rpm. Lastly I decided to stump up the cash and get the injectors reconditioned thinking that they were the root cause. After a nightmare getting them out as 2 were seized solid and i had to fabricate a puller, all 4 were found to be well out of Spec and have been refurbished by bosch. Great I thought all fixed, well no unfortunately it still does the same and then I found this thread. I'd already ruled out the boost control solenoid after replacing a vacuum hose and testing the vuccum pump. I can see the turbo actuator arm physically moving in and out in relation to the throttle being depressed whilst stationery but I'm wondering if I overlooked something as this was such a sure fire fix for you both. Do the solenoids act differently under load, had your solenoids packed up completely?
Thanks in advance
Damian

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