Jump to content
SAU Community

Blowing Smoke

CATKICKER

By CATKICKER,
in General Maintenance

 Share

Recommended Posts

CATKICKER Mentor

CATKICKER

Posted
Posted

Hi Guys, my car started puffing smoke the other day and I might be looking at replacing the engine (has done over 220,000kms - RB20DET)

It happens when I absolutly gas it (around redline / fullboost) and when I back off or change gear, it puffs a pretty big cloud of dark smoke (don't think it is fuel)

I don't think it is my turbo as it is at high RPM not specifically high PSI that it happens. Plus I recently replaced it with a low km R34 turbo.

It is still driving perfectly fine, pulls hard but just puffs pretty hardcore when I back off. Started happening on a big highway drive a few weeks back and hasn't gone away. Pretty embarrasing when you drag someone off at the lights and then cover them in smoke!

Anyway, long story short, before I take it in to the mechanic for a diagnosis, what could it be?

Worn Rings? - I would have thought it would happen all the time not just when backing off

Worn / Damaged Valves? - Most likely in my mind...

Catch Can? - Maybe it is how I hooked it up? - Did a bit of research on here how others have done it...

Would be great to get some ideas.

Thanks in advance!!

Todd

Link to comment
https://www.sau.com.au/forums/topic/132833-blowing-smoke/
Share on other sites
CATKICKER Mentor

CATKICKER

Posted
  • Author
Posted
if it is dark, then it is most likely just fuel. do you have an atmo bov? if you do then this may be the cause.

Yeah, but I still have the factory one... Might be the cheapie leaking? Might try putting in a couple of washers and removing the vaccume hose (and block that off of course)

Thanks very much for you help!

Todd

Link to comment
https://www.sau.com.au/forums/topic/132833-blowing-smoke/#findComment-2460208
Share on other sites
CATKICKER Mentor

CATKICKER

Posted
  • Author
Posted

Well... it wasn't the BOV!

I am going to have to check the ECU for error codes. Lets see if there is any insight in there... I am still thinking it is oil, it would have to be a SHITE load of fuel, and it seems to be running well!

Any other ideas?

Once I get the final verdict from the shop, I may look at replacing the engine with a low k jobbie (will only need the engine, no box, loom, puter or manifolds...) and building this one up over time with some more solid internals.

Link to comment
https://www.sau.com.au/forums/topic/132833-blowing-smoke/#findComment-2462342
Share on other sites
CATKICKER Mentor

CATKICKER

Posted
  • Author
Posted

I haven't had a chance to check the error codes... just wondering if it was fuel, could it be the AFM? and if that was the cause, could a faulty AFM cause my idle issue - Sits at 1500rpm when I stop at the lights and then after 5secs or so, it goes down... The problem goes away after an ECU reset but comes back after around 200k's. This leads me to think that the ECU is recieving an error (MAYBE THE AFM) and tries to adjust the A/F ratios to a safe level... Resetting the ECU didn't fix the cloud of smoke issue.

Just a thought.

BTW, I originally thought it could be the O2 sensor (idle issue) so I replaced that and rest the ECU. (obviously fixed it temporaraly) I also resoldered the AFM internals, cleaned it and cleaned out the ACC valve.

Seriously guys, I really do appreciate your help and will help others out when I can!

Thanks!

Todd

Link to comment
https://www.sau.com.au/forums/topic/132833-blowing-smoke/#findComment-2469173
Share on other sites
SLYLNE Rising Star

SLYLNE

Posted
Posted

my mates 33 gtst does this, after he boosts and changes gear after a few moments this huge puff of smoke comes out of his exhaust...

only thing came to mind was, either turbo smoke or bcoz he has no cat?

anyone confirm, having no cat would make smoke come out like that?

Link to comment
https://www.sau.com.au/forums/topic/132833-blowing-smoke/#findComment-2478660
Share on other sites
RB30-POWER Mentor

RB30-POWER

Posted
Posted (edited)

More then likely its just blowby that is getting sucked into the chamber through the PCV valve when you back off. The valve is held closed when there is no manifold vacuum (on boost) and when you back off it gets sucked through and out the exhaust. All sounds normal to me.

Edited by RB30-POWER
Link to comment
https://www.sau.com.au/forums/topic/132833-blowing-smoke/#findComment-2478953
Share on other sites
  • 4 weeks later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • The Bogan
      NC MX5

      By The Bogan · Posted

      So, version 4 intake is on its way I was looking at these a while ago but at around $200 or more it was a little pricey for something that might not work, but, I had it in my watch list, but, I got a message saying it was on special, and I had a code thingie to use, it eventually came in at $120 delivered, so BAM, BUY NOW.....LOL I'll need to have a look when it arrives but I feel it will "look" better than what I currently have, as it comes with a PCV fitting, so I will be able to get rid of the alloy pipe that goes to the throttle body with the PCV fitting  Well, that's what the voices in my head are telling me  Oh, and this happened today Yeap, it was a Trojan, and it was cheap, so I headed back to the hardware store and actually spent a little bit more on a heavy duty,  one that was actually recommended by a plumber mate, a Cyclone one with a fibreglass handle that is actually rated for clay The broken shovel will eventually be "modified" into a short handle shovel
    • MBS206
      What should I do next to hold the head on

      By MBS206 · Posted

      When you pulled it off, there is no signs of blown head gasket? Is it possible you have some other issues going on? Possible cracked blocked? Or do you think it's straight up lifting the head? Did you check what the head was torqued to before pulling it down (To see if possibly they're stretching, or starting to break threads out etc)?
    • jez NF
      The Evolution Of "night Fury"

      By jez NF · Posted

    • Rezz
      Chris' Toyota Mark ii JZX110

      By Rezz · Posted

      Seems like a decent result for a modded JZX110. They are bulky in comparison to the 100 and 90 models (which I'd prefer myself) but they are getting very few and far between here in JP these days. Thanks for the detailed review and the import process into the UK. I also have a car which I'm hoping to export from Japan at some stage so it's good to know if someone from the UK was interested in it. By the way the corrosion underneath is par for the course for cars which were located in/near the mountains or along the Japan sea coastline. They get huge amounts of snow every winter and the sodium chloride is used on the roads. Many cars have some kind of rubber like treatment underneath but they tend to limit it to the wheel arches underbody and fuel tank. Suspension arms and sub-frames will have similar corrosion to your JZX110 which is a common sight. See it all the time and car dealers here generally don't even mention it unless asked.
    • Kinkstaah
      new 1.5 LSD issues/concerns

      By Kinkstaah · Posted

      If the sound goes away when you clutch in, the 1.5/2 way diffs are just shit, and you are a normal person. The diff is likely "fine" but driving at anything under 30kmh is a violent horrible experience. It would be exaggerated with solid diff bushings and subframe bushings if you have those.
×
×
  • Create New...