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Author Topic: Dry white smoke.  (Read 4642 times)

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Doctor Gollum

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Dry white smoke.
« on: 21 February 2023, 18:15:45 »
Petrol, fuel injected car showing p2197.

Would this result in a smoke screen :-\

100% certain it isn't steam... It's dry and there's no evidence of any cooling system problems or oil/water where it shouldn't be or excessive pressure etc. And no pressure, positive or negative, at the the oil filler cap or dipstick.

Car has done perhaps 1,500 since 2021. 21 mot was clear, 22 was a fail excessive smoke, EML on, a broken spring and loose mirror.

Only codes are low voltage/CAN communication errors due to low voltage and the p2197 Bank 2 Sensor 1 stuck lean.

Starts fine with a booster and idles/revs normally. No misfire or rough idle.
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Viral_Jim

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Re: Dry white smoke.
« Reply #1 on: 21 February 2023, 18:59:42 »
Excess fuel in the combustion chamber.

Presumably if the sensor is reading too lean the ECU will have "learned" itself richer and richer until it's reached some kind of maximum injection time and then thrown an error because it's still showing as a lean burn.

Forget the smoke, fix what's causing the sensor error and the smoke will go.

Also a hint as to make, model and engine wouldn't go amiss  ;)
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Doctor Gollum

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Re: Dry white smoke.
« Reply #2 on: 21 February 2023, 19:16:34 »
Merc CLK350, so M272.
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Sir Tigger KC

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Re: Dry white smoke.
« Reply #3 on: 21 February 2023, 19:18:04 »
Quote from: Viral_Jim on 21 February 2023, 18:59:42

Also a hint as to make, model and engine wouldn't go amiss  ;)


It's an Alabama Mumsy Bus.  Didn't you know?  ;D
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Doctor Gollum

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Re: Dry white smoke.
« Reply #4 on: 21 February 2023, 19:18:56 »
Quote from: Sir Tigger KC on 21 February 2023, 19:18:04
Quote from: Viral_Jim on 21 February 2023, 18:59:42

Also a hint as to make, model and engine wouldn't go amiss  ;)


It's an Alabama Mumsy Bus.  Didn't you know?  ;D
It isn't as it happens  ;D
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Nick W

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Re: Dry white smoke.
« Reply #5 on: 21 February 2023, 19:24:43 »
Has somebody put diesel in it?


Faulty(not closing) fuel injector?
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Doctor Gollum

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Re: Dry white smoke.
« Reply #6 on: 21 February 2023, 19:28:37 »
Quote from: Nick W on 21 February 2023, 19:24:43
Has somebody put diesel in it?


Faulty(not closing) fuel injector?
The first, I can't rule out, but it has been sat since last July and it was an issue then.

The second, I will need to buy it to find out. But the fact that it isn't misfiring would suggest that it isn't flooding a single cylinder enough to extinguish the spark :-\
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dave the builder

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Re: Dry white smoke.
« Reply #7 on: 21 February 2023, 20:02:47 »
Engines that sit for long periods can get stuck oil control / piston rings ,
also cars not serviced well that get an engine flush also get stuck rings  ,
lots of white smoke ,cats can't cope  :(
I've had this to resolve a couple of times  :(
(strip ,clean, new rings , hone ) time consuming ,plus expensive new gaskets and rings etc   ::)
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Doctor Gollum

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Re: Dry white smoke.
« Reply #8 on: 21 February 2023, 20:22:31 »
Have to say, there's significantly less smoke out of it today compared to when I looked at it in early December.  :-\
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dave the builder

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Re: Dry white smoke.
« Reply #9 on: 21 February 2023, 20:30:44 »
Quote from: Doctor Gollum on 21 February 2023, 20:22:31
Have to say, there's significantly less smoke out of it today compared to when I looked at it in early December.  :-\
leave it running for a while , if it's stuck rings ,the smoke will get worse ,like a 90s disco*

Disco * "a club or party at which people dance to recorded pop music"
Not the dirty Smokey Land rover product  :D
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Doctor Gollum

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Re: Dry white smoke.
« Reply #10 on: 21 February 2023, 20:39:13 »
Quote from: dave the builder on 21 February 2023, 20:30:44
Quote from: Doctor Gollum on 21 February 2023, 20:22:31
Have to say, there's significantly less smoke out of it today compared to when I looked at it in early December.  :-\
leave it running for a while , if it's stuck rings ,the smoke will get worse ,like a 90s disco*

Disco * "a club or party at which people dance to recorded pop music"
Not the dirty Smokey Land rover product  :D
;D

https://youtu.be/ww4WWEHcoLs December...

https://youtu.be/Ts2ktPs8kOw Today, upto to temp...
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dave the builder

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Re: Dry white smoke.
« Reply #11 on: 21 February 2023, 20:58:33 »
December vid is just like stuck rings
today video  a lot less  WORRYING  :P
you also need to factor in that a car (that you don't know what's happened too it) may have loads of crap/oil/water in the exhaust pipes and the engine may well be fine NOW but needs a blast , or has an issue that wouldn't cost the earth to sort .

I only mention "stuck rings" on a "white smoke" thread because i#ve been there TWICE  :-[
you'd think oil is blue smoke ,not always

that said ,i'm not saying buy it , or don't buy it  ;)
though you do seem to like buying problems Mercs  :D
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Raeturbo

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Re: Dry white smoke.
« Reply #12 on: 21 February 2023, 21:14:21 »
I agree, check it after an Italian tune up👍
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Doctor Gollum

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Re: Dry white smoke.
« Reply #13 on: 21 February 2023, 21:19:47 »
Well, the belt squeal fixed itself :D

It’s cheap enough to be tempting, and apart from a handful of advisories, a pair of rear springs and a bloody good clean, it certainly has potential...

Quote from: Raeturbo on 21 February 2023, 21:14:21
I agree, check it after an Italian tune up👍
Which would be after buying it >:D

That said, it revs OK, with no missing. Also I didn't reset the codes.

So are we saying that with a service, fresh fuel and a decent blast it might be viable :-\
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Raeturbo

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Re: Dry white smoke.
« Reply #14 on: 21 February 2023, 22:10:08 »
Leak down test would obviously be invaluable, but those motors are normally pretty sturdy….
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