Smoking

[davev 1]

hi,

 

the pug has developed smoking problem.

 

i had finaly got the the pug to run smothly(ecu temp sensor wires came apart in the plug). so i took it for a spin, but when going to the higher revs the car smokes really bad(like an f1 car with a blown engine).so i pulled over and it settled down, and on the way back i found it dont really smoke at lower revs even at full throttle. its only at the higher revs it smokes constantly even when the revs drop back down.

 

does anyone have any ideas of what this could be. i thought mabe overfull but th oil was on the max when i checked it when i got back. and you could still smell the smoke but not see it.

 

cheers. dave.

[hengti 2]

from the sounds of it, it's most likely to be the stem seals

 

generally, shot stem seals show on start up - smoking that clears quite quickly, or if you boot it to high revs (say in second gear) and lift off the gas and allow the car to coast - you'll see smoke in the rear view mirror. valve guide wear can also cause this though.

 

if the piston rings are on the way, you'll generally get smoke all of the time

 

 

i'd personally save myself a boat load of money and get the stem seals replaced with the head on as a first step. it's a contentious issue though; some people seem to take it as a green light to spending loads of money rebuilding the head (which you'd need to do if it were the guides). mine's mega mileage and only burns a little - used to burn an awful lot though; had the stem seals done & it was cured

Edited April 23, 2006 by hengti

[steve@cornwall 100]

hi,

 

the pug has developed smoking problem.

 

i had finaly got the the pug to run smothly(ecu temp sensor wires came apart in the plug). .

 

Has probably overfuelled massively, does your oil smell of petrol? i would think its worth doing an oil and filter change, has sorted smoking following overfuelling on a couple of my pugs in the last couple of years,

never wasted money as you cant change oil too often can you?

[davev 1]

i could really smell any petrol, but could a bit of fuel cause it to burn oil?

 

also this is not the daily drive.started it a couple of weeks ago for a clearout but it ran ilke crap. tought i flooded it on start up as the batterys dead. last week i had a good look and realised it was overfueling like mad. would only run without any throttle when the idle control screew was out. then it was about 2k revs.

 

i rememered the temp sensor and changed it yesterday only to find when checking the connection was good that the wires come out the plug.

 

cheers. dave.

[steve@cornwall 100]

i could really smell any petrol, but could a bit of fuel cause it to burn oil?

 

Made both of mine smoke like lab beagles, really thins the oil and I believe vaporises when hot and travels up the crank ventilation system straight into the inlet tract! If really thin and breathers slightly blocked, I've been told oil can be forced up past the rings into the cylinder ( then again I've also been "told" that 1.6 gtis can''t run unleaded!) Whatever the cause,yeah they can smoke like hell after overfuelling's been fixed.

[davev 1]

by the way that was meant to be couldnt not could. soz

[GLPoomobile 958]

On the whole subject of valve stem seals and piston rings, what do you reckon to mine? It smokes all the time but seems to be worse when it has warmed up. Don't tend to notice any smoke behind me most of the time unless moving slowly. Seems to be most noticeable about 10 seconds after pulling up (like in traffic) and idling, and then when pulling away there will be a bit more of a cloud. Compression test was OK with about 13 bar on 3 cyclinders and just a smidge lower on the 4th (or 1st, can never remember which way it goes) and a spoonful of oil didn;t bring the compression up.

 

I've known about the problem since before I bough the car and have just hoped that it's valve stem seals. I am going to sort the head eventually but everything moves slowly with me!

[hengti 2]

from a diagnostic point of view, my understanding is as per above post

 

but - the stem seals can seem to contribute to massive oil buring problems, so i'd get that done (with the head on - to minimise costs) first. i remember mine used to burn pretty much from max to min in about 3-400 miles!!

 

it still burns some - that'll be a combination of the rings & guides, but the point is that the oil consumption is now barely a problem

 

 

stem seals first - cheapest option - and likely to be the biggest contributor

[d7ve_b 44 1 Cars]

from a diagnostic point of view, my understanding is as per above post

 

but - the stem seals can seem to contribute to massive oil buring problems, so i'd get that done (with the head on - to minimise costs) first. i remember mine used to burn pretty much from max to min in about 3-400 miles!!

 

it still burns some - that'll be a combination of the rings & guides, but the point is that the oil consumption is now barely a problem

stem seals first - cheapest option - and likely to be the biggest contributor

 

When you say 'cheapest option', how cheap do you mean and is it a DIY job?

[hengti 2]

i paid someone to do it - it was about £160 - but that was a while ago now

 

there's probably a guide on search somewhere to help the DIY'er

[Ahl 4]

mine's mega mileage and only burns a little - used to burn an awful lot though; had the stem seals done & it was cured

Mine too. Its amazing how smokey it can get and how much can be consumed just through worn stem seals.