|
|
Post by bolo1957 on Dec 28, 2020 14:35:15 GMT
On my 2007 rav 4 4wd Deisel . it starts to emit white smoke from the exahst after about 10 min driving , previous owner said it has had a pressure test and all was ok , it drives really well with no lack of power , doesnt overheat and coolant level stays ok as do the oil level . it also gives off an odd smell , the DPF warning comes on occaisionally ive put various fuel additives in and taken it for long runs it goes off for a while but so far keeps coming back on ,
Was talking to a qualified mechanic recently, I explained all the symptoms to him and and He feels it could be the turbo or the piston rings, I'm hoping it's not either as not in a position to get either repaired. There's absolutely nothing wrong with the way the car performs and all fluid levels have remained the same since I have had it the only problem is the big cloud of smelly smoke I leave behind. , the car has been with a qualified mechanic for about 6 weeks , he ruled out the turbo and the rings and said it was the DPF he did a cleaning process of injecting two lots of cleaner into the dpf and some acid of some sort followed by a forced regeneration, had the car back , took it out for a run ,NO CHANGE still smoking after it warms up , so £250 later back to square one . Iread a post which im thinking of trying , it says about unplugging the 5th injector to stop the DPF from constantly trying to regenerate thats if i can find the 5th injector as im a complete novice dont know if this is safe to try but it solved the smoking problem for him . so any thoughts or pointers would be much appreciated , happy xmas all
|
|
|
|
Post by clarki on Dec 28, 2020 18:39:51 GMT
Was always under the impression white smoke = knackered turbo, black/blue = knackered engine.
If the pdf is playing up/blocked then you'll usually find a fair drop in performance, but not necessarily any smoke.
What engine/transmission do you have?
|
|
|
|
Post by davrav on Dec 28, 2020 18:53:18 GMT
|
|
|
|
Post by shcm on Dec 29, 2020 10:50:58 GMT
Iread a post which im thinking of trying , it says about unplugging the 5th injector to stop the DPF from constantly trying to regenerate thats if i can find the 5th injector as im a complete novice dont know if this is safe to try but it solved the smoking problem for him . so any thoughts or pointers would be much appreciated , happy xmas all Hmmmmmmmmm, disconnecting the 5th injector will most likely prevent the DPF from heating up for the regeneration, hence no DPF regen and yes, no "regen smoke", but I would have thought ultimately, you'll just end up with a clogged DPF, because the DPF will no longer be getting hot enough to regenerate. Doesn't sound like a great solution to me. What disconnecting *might* tell you is whether the 5th injector is leaking or not (i.e. if smoking continues after the injector is disconnected, provided there's nothing wrong elsewhere). I would have thought disconnection would throw a "5th injector open circuit" DTC, too. However, I believe the vehicle won't attempt a DPF regen until it's up to working temperature and the fact that you only see smoke when it's reached operating temperature, suggests the injector may be doing what it's supposed to (unless its a thermally related 5th injector leaking problem). Does it ever stop smoking? i.e. Indicating a complete regen cycle? It may need a good long run for this. Which vehicle is this? With age & DPF I assume a T180? *If* it's purely DPF system related, I'd at least go looking around the the DPF upstream/downstream temperature sensors and the DPF differential pressure sensor (and pipes). ......but there can be a whole heap of related things, with respect to excessive soot (PM) or white smoke generation (incorrect fuel/air ratio) (see the attached pdf with information related to DPF DTCs), which may cause excessive regen cycles or smoke e.g. EGR, MAF, worn injectors, turbo, exhaust system leaks, blah, blah.......... Things like incorrect engine oil type can be a factor in generating excessive PM and regen and also if the DPF is refurbished/replaced, the DPF thermal deterioration record should be reset in the EMS, otherwise that may lead to excessive regen cycles or DTCs. I only speak from many years of vehicle ECU design experience and system knowledge. Others on here, *may* have seen far more actual physical failures and fixes, than me.
Good luck!
DPF.pdf (485.73 KB) |
|
|
|
Post by three5 on Dec 29, 2020 11:50:46 GMT
Iread a post which im thinking of trying , it says about unplugging the 5th injector to stop the DPF from constantly trying to regenerate thats if i can find the 5th injector as im a complete novice dont know if this is safe to try but it solved the smoking problem for him . so any thoughts or pointers would be much appreciated , happy xmas all Hmmmmmmmmm, disconnecting the 5th injector will most likely prevent the DPF from heating up for the regeneration, hence no DPF regen and yes, no "regen smoke", but I would have thought ultimately, you'll just end up with a clogged DPF, because the DPF will no longer be getting hot enough to regenerate. Doesn't sound like a great solution to me. What disconnecting *might* tell you is whether the 5th injector is leaking or not (i.e. if smoking continues after the injector is disconnected, provided there's nothing wrong elsewhere). I would have thought disconnection would throw a "5th injector open circuit" DTC, too. However, I believe the vehicle won't attempt a DPF regen until it's up to working temperature and the fact that you only see smoke when it's reached operating temperature, suggests the injector may be doing what it's supposed to (unless its a thermally related 5th injector leaking problem). Does it ever stop smoking? i.e. Indicating a complete regen cycle? It may need a good long run for this. Which vehicle is this? With age & DPF I assume a T180? *If* it's purely DPF system related, I'd at least go looking around the the DPF upstream/downstream temperature sensors and the DPF differential pressure sensor (and pipes). ......but there can be a whole heap of related things, with respect to excessive soot (PM) or white smoke generation (incorrect fuel/air ratio) (see the attached pdf with information related to DPF DTCs), which may cause excessive regen cycles or smoke e.g. EGR, MAF, worn injectors, turbo, exhaust system leaks, blah, blah.......... Things like incorrect engine oil type can be a factor in generating excessive PM and regen and also if the DPF is refurbished/replaced, the DPF thermal deterioration record should be reset in the EMS, otherwise that may lead to excessive regen cycles or DTCs. I only speak from many years of vehicle ECU design experience and system knowledge. Others on here, *may* have seen far more actual physical failures and fixes, than me.
Good luck!
View Attachment As usual, shcm makes a good point about journey length. Do you do a lot of short(ish) journeys? I have the older ( 137BHP ) engine and had a problem with black smoke just less than a year ago. The diesel specialist that I took it to gave it what I've always thought of as "an Italian decoke" and the emissions figure returned to it's normal level. Where are you based? |
|
|
|
Post by phaeton on Dec 31, 2020 17:02:36 GMT
Was always under the impression white smoke = knackered turbo, black/blue = knackered engine.
I was also told,
White was head gasket
Blue piston rings or if just on start up, valve stems
Black over fueling
|
|
|
|
Post by bolo1957 on Dec 31, 2020 17:45:15 GMT
the garage says its not the rings or the turbo, thanks all some very interesting points raised , the car is a Dcat T180 2007 110,000 miles im based in cardiff , I have taken it on a few 100 plus mile runs (lockdowns permitting) to try and clear the dpf, also spent a fortune on fuel additives dpf cleaner.injector cleaner,fuel system cleaner red X etc etc , all this was prior to it going into the garage where they ruled out the rings and also the turbo and performed some sort of DPF clean which hasnt stopped the smoke. the point about it having the right oil i read this elsewhere also so bought some low saps 5w 30 c1 dpf oil I mentioned this to the mechanic in the garage and he said he couldnt see it making any difference so i havnt put it in , maybe i should try that next thanks again for the help
|
|
|
|
Post by bolo1957 on Dec 31, 2020 17:52:30 GMT
heres a video i made a while ago ,as you can see i know nothing about cars , in the video it doesnt start smoking until the last minute or so when i returned from a short local run
|
|
|
|
Post by bigkev on Dec 31, 2020 20:27:21 GMT
2007.......T180........100k plus.........oops........
|
|
|
|
Post by bolo1957 on Jan 7, 2021 19:00:32 GMT
UPDATE I changed the oil to the low saps C1 and its made a big difference, it has not stopped smoking completly but a whole lot better , took it for 20 mile run and other than a couple of small puffs occaisionaly it only had a prolonged smoke for about a minute half way into trip and then stopped ,dont know if this result throws any light on to the problem . many thanks again for any help would be most appreciated , the smoking starts 30 secs into attached video
|
|
|
|
Post by bolo1957 on Jan 9, 2021 13:38:05 GMT
i spoke to soon , it has started to smoke again just as before , i have now unplugged the 5th injector and the smoke has stopped but as schm says it is not ideal . i spoke to the garage that cleaned the dpf and he said he couldnt understand why its trying to regen all the time, he asked me if i could get the following infomation from someone on here ( ask if anyone has data from a known good performance DPF and in particular the Pressure sensor. Either voltage feedback or sensor differential. Hopefully at idle, approximately 3000 rpm and snap throttle. )its all double dutch to me but i do feel as if progress is being made in pinpointing the problem thanks to everyones help on here any further help with the above data would be most appreciated
|
|
|
|
Post by charliefarlie on Jan 9, 2021 13:59:55 GMT
I take it the OP is aware of the history of not only but in parts the T180 engine ??
|
|
|
|
Post by bigkev on Jan 9, 2021 15:03:54 GMT
I take it the OP is aware of the history of not only but in parts the T180 engine ?? Methinks ye best post up yer linky, Charlie...... |
|
|
|
Post by davrav on Jan 9, 2021 16:52:37 GMT
|
|
|
|
Post by bolo1957 on Jan 9, 2021 18:09:41 GMT
obviously to late for toyota to replace the engine , not sure what OP is but it seems to me the suggestion is a lost cause scrap it , which i dont want to do for despite the smoke problems its the best car ive ever had, thanks anyway
|
|
