Hello Everyone.
Its been a while since i been active here, and for all that missed me, im truly sorry...
anyways,
I have an issue on my E92 335i N54 in that its smoking when i decelerate, and at idle. no other time.
I have also noticed it happens when feathering the throttle in a cruising scenario is D mode, at low rpm, this sends me to the thought that my issue only happens in vacuum mode. just a thought.
So far i have done the following, in this order.
I have Chinese turbos, the car was smoking so i assume they stuffed out being chinese, and decided to have them rebuilt. so off they came and were sent in, the rebuilder is very well known here in Johannesburg, and has an incredible reputation. he asked me after stripping them down, why i sent them to him, as they were in great condition, only gripe was that the Thrust bearing has some slight premature wear, but he wouldnt call it alarming.
They were rebuilt, balanced on the VSR machine, and given a clean bill of health.
Got the car back, it seemed ok, but after a couple days. the smoking was back.
After tons of more research, i read that Valve Stem Seals have the very similar symptoms to turbo seals. and so i had the Car booked in for Valve Stems seals.
Got the car back and while going up the road on my way home i saw smoke again as i came to a stop. and its been like this ever since.
Ive also had another Brand new Valve cover with Gasket replaced. this came obviously with a new PCV valve, also didnt help, car still smoked, so that ruled out a cracked VCG, or PCV.
I then got my hands on an upgrade PCV valve. and again no cure.
I do not have an OCC, but, i dont believe this would assist my issue here, but, im open to trying it so will try obtain one at some piint just to rule it out.
I then conducted a compression test, and this passed, as i was worried that i have damaged rings.
Cyl1. 150psi
Cyl2. 150psi
Cyl3. 150psi
Cyl4. 140psi
Cyl5. 145psi
Cyl6. 150psi
I thought these values may be low, but i read on multiple threads that 150psi is the normal value to see, and a variance of around 10% is acceptable to deviate at another cylinder. can anyone confirm this?
Another point i need to conduct, is the Oil Return Lines. i still ahve the original lines, and they maybe clogged, or worn or whatever, as they have been through 3 turbo removals and refitments in my 2 1/2 years ownership. so they may be the culprit, however, i hold my breath till they get done, which im hoping will happen this thursday.
I have been speaking to 4 other N54 drivers in my area, and all there cars are doing the same thing, smoking on Decel.
1 has MMP 1K turbos,
1 is stock turbos
and the others are chinese hybrids like mine, so that rules out the fact that its shitty Chinese turbos, as the car is still performing great, just has the smoke and goes through oil reasonably fast.
besides the Oil Drains, im at a loss as to what this could be caused by.
Anyone had this before and cured it?
Thanks in advance guys.
Its been a while since i been active here, and for all that missed me, im truly sorry...
anyways,
I have an issue on my E92 335i N54 in that its smoking when i decelerate, and at idle. no other time.
I have also noticed it happens when feathering the throttle in a cruising scenario is D mode, at low rpm, this sends me to the thought that my issue only happens in vacuum mode. just a thought.
So far i have done the following, in this order.
I have Chinese turbos, the car was smoking so i assume they stuffed out being chinese, and decided to have them rebuilt. so off they came and were sent in, the rebuilder is very well known here in Johannesburg, and has an incredible reputation. he asked me after stripping them down, why i sent them to him, as they were in great condition, only gripe was that the Thrust bearing has some slight premature wear, but he wouldnt call it alarming.
They were rebuilt, balanced on the VSR machine, and given a clean bill of health.
Got the car back, it seemed ok, but after a couple days. the smoking was back.
After tons of more research, i read that Valve Stem Seals have the very similar symptoms to turbo seals. and so i had the Car booked in for Valve Stems seals.
Got the car back and while going up the road on my way home i saw smoke again as i came to a stop. and its been like this ever since.
Ive also had another Brand new Valve cover with Gasket replaced. this came obviously with a new PCV valve, also didnt help, car still smoked, so that ruled out a cracked VCG, or PCV.
I then got my hands on an upgrade PCV valve. and again no cure.
I do not have an OCC, but, i dont believe this would assist my issue here, but, im open to trying it so will try obtain one at some piint just to rule it out.
I then conducted a compression test, and this passed, as i was worried that i have damaged rings.
Cyl1. 150psi
Cyl2. 150psi
Cyl3. 150psi
Cyl4. 140psi
Cyl5. 145psi
Cyl6. 150psi
I thought these values may be low, but i read on multiple threads that 150psi is the normal value to see, and a variance of around 10% is acceptable to deviate at another cylinder. can anyone confirm this?
Another point i need to conduct, is the Oil Return Lines. i still ahve the original lines, and they maybe clogged, or worn or whatever, as they have been through 3 turbo removals and refitments in my 2 1/2 years ownership. so they may be the culprit, however, i hold my breath till they get done, which im hoping will happen this thursday.
I have been speaking to 4 other N54 drivers in my area, and all there cars are doing the same thing, smoking on Decel.
1 has MMP 1K turbos,
1 is stock turbos
and the others are chinese hybrids like mine, so that rules out the fact that its shitty Chinese turbos, as the car is still performing great, just has the smoke and goes through oil reasonably fast.
besides the Oil Drains, im at a loss as to what this could be caused by.
Anyone had this before and cured it?
Thanks in advance guys.