Hi guys, Need your advice. I have a 2002 150 bhp Gt Tdi, which on hard acceleration blows out a lot of black smoke through the exhaust. Not just a puff, I mean smoke screen standards[:^(] I can even see a line of soot on the road where I had driven. The car is mainly used on the motorway so I never really noticed it but now I use it around town cant put my foot down! Any ideas what can be causing this? Cheers
Hello - this could be down to a few things.... any fault codes? Bad remap, Crap fuel, air/vac leak, Bad N75, Bad MAF, faulty altitude sensor or temp sensor, bad injector timing (usually happens after a cambelt change when a garage doesn't time the injectors up properly)
The garage have said there are no fault codes. If the cambelt hasn't been timed properly will that effect how the car drives as it still seems to drive fine? Also if there are no fault codes can parts still be faulty?
Took the car to the garage yesterday, they said that there was a lot of oil in the intercooler and turbo pipes. They cleaned it out and sugested to drive the car and see what happens. I did notice that there is less smoke coming out but there is still some smoke. Any ideas on why there is oil in the pipes and would this cause black smoke because I thought oil means blue smoke?
If the car still drives fine could I still have a boost leak? Also just noticed my temp gauge is not working. Having checked the sensor (under 3 glow plugs) I have found the wiring plug has come of the sensor? Will this sensor effect the running of the engine or is it just for the temp gauge? Also the wiring clip seems to be broken and does not stay on the sensor, can it be replaced or am I in trouble?
When one of my boost hoses, next to the intercooler, split, thus creating a leak, the Golf was kicking out major amounts a black smoke when this happened, but only under hard aceleration. I know, your hoses and intercooler set is different, but, I would check to make sure you have got a leak somewhere.
could still be boost leak which isn't big enough all the time to 'bucket-fill' and trip an error code does temp (I presume coolant) supply PCM? If so, it will have an effect, the m,agnitute will depend upon the strategy's default value oil in boost pipes -either pulled past the compressor bearings or piston blow-by causing oil past the rings and through PCV. Is the compressor oiled also? May cause black smoke depending upon the combustion system / injection strategy try letting the vehicle idle drive in 3rd gear until engine speed is stable, tip-in 100% - does it smoke before any boost is made or only when it comes on boost? any work done on the car recently?
The smoke only comes out on boost ie hard acceleration. The engine was rebuilt about 1 year ago and checked again 1/2 a year ago so piston rings should be ok. Also the turbo had been changed twice. Faults code have now been checked and all cleared after the temp sensor was replaced. I have No idea whats happening!!!
Update: Its gone to a specialist who reckon its the injectors, so they are now removing them to test.
sounds like a big assumption, have they checked for boost leaks?? my pd130 back in the day left soot tracks when i split a boost pipe. after that the egr decided to stick open. once the egr was disabled and the hose sorted the car was fine
I did have the pipes checked before but no luck. Could i have enegr problem although there are no error codes?
It won't give a error on a stuck EGR open on a mk4, but it would drive with real low boost feel to it oil in the pipes is part of the design of the beather (or flaw), black smoke is from either over fueling, air reading faults too high, or loss of air all sevice items up to scratch air filter clean, fuel filter sub 30K old the sensor wire attached (which was loose )to a fuel pipe? this measures the fuel temp which makes a difference
After a call from the garage i am now pulling my hair out! They have said the injectors all check out, and need to investigate further. Im not going to be impressed if they turn around to me saying it a boost leak as they should have checked the simple things 1st. Car drives great and is always fully serviced using dealer parts on time so dont think its a stuck egr. I will get them to check to fuel temp wire though. One thought I had, when the engine was checked 1/2year ago they did have the injectors out. If they didnt put these back in properly could this have caused the problem, ie do the injectors just bolt in or do they have a correct fitting technique?
Well i got the car back yesterday, with the same problems after the garage reckoned the smoking stopped after they put the injectors back in!!! On the drive back home the esp light came on then the engine started to missfire bad. This morning the esp light came back on during the drive back to the garage. But the missfire had gone! As i got near to the garage the missfire came back but not as bad. When they took it for a test drive the missfire had gone and esp light wasnt on. Luckily after a while the esp light came on. After the computer check they now reckon the wiring loom to the injectors is causing the missfire and they say the car has been remapped as the ecu has had values changed. Im sure the loom was damaged by them. They say only Vw or someone can correct the ecu values back to standard. I find this strange as ive owned the car for 7 years, never having it remapped and bought it from an exlease company. My local garage reckon they havent ever messed with it either. Any ideas on who can check the car is running with factory set values and if not change them back? Or are they just fobbing me off?
Sorry i never asked for them and before this new missfire problem the garages said there were no error codes. I'll check with them when igo back to collect it.
id recommend you get a cable off ebay, its only 15, rather than relying on garages. where are you based? there might be a local cgti-er who might be able to help
I have one, but never used it to check the missfire problem, as i just took it straight back to the garage. They did say the new problem was throughh the abs/esp menu now stating a problem with no. 3 injector. Just called me now saying the new wiring loom for the injectors hasnt worked so they will be keeping it for more checks. He said it maybe the ecu, but when i told him the problem with the esp light and missfire has only occured after they done there injector tests, he said "oh we will look into it" Wish i never bothered now and just lived with the black smoke!
what was the fuel fiter service history like, intank fuel pump working? I'll reckon the injectors are goosed, the ESP light comes on when it sees a fault in the engine ECU when it miss fires, you can see the issues using diagnostic PC with the readness codes for each unit
Did they use new washers, or re-anneal the old ones? Not sure if that could cause your problem, but leaking compression from the injectors won't help.
