here is a vid as some of you know the car has been of the road for 8 months with the battery disconnected in that time the engine had not been run what so ever I just finished a auto to manual swap started the car for the first time and is smoking I don't know if it need a good run now or something has gone wrong while its been no running the car didn't smoke atall before any ideas whats going one thanks just click on the pic and the vid will play

Edited September 28, 201411 yr by dan300zx

If it has a very small leak from turbo seals, pcv valves even stem seals it will probably have oil now in the exhaust which will probably take a good drive to burn out...

Take it for a good run then see what its doing, i have replaced turbos on cars and the oil thats in the exhaust takes a really good drive to stop it smoking.

It could have a really slow leak of oil say from the seals that driving often would not show but puddles of oil from 8months could have been pushed somewhere.

my car smokes if left for months a good run and it stops...

And anyhow there smokey old datsuns from new...well thats what my dad says to torment me lol...

I have let it run for a while cant really go for a run as no mot tax no bumpers on no head lights in.

I would remove IC pipes to see if any oil in the intake. Then check afr to see if it is over fuelling. Then compression test to check, well compression. All this work will take an hour or 2.

 

This will eliminate some problems then you can check others. Don't worry too much, the car isn't road legal yet.

 

Ta

how can I check afr have no meter. am going to the mot station 2 moz just top of my road there going to probe it see what the co and hc are

Buy a wideband lambda system or find someone that has one.

Edited September 29, 201411 yr by Noz

If it has a very small leak from turbo seals, pcv valves even stem seals it will probably have oil now in the exhaust which will probably take a good drive to burn out...

Take it for a good run then see what its doing, i have replaced turbos on cars and the oil thats in the exhaust takes a really good drive to stop it smoking.

It could have a really slow leak of oil say from the seals that driving often would not show but puddles of oil from 8months could have been pushed somewhere.

my car smokes if left for months a good run and it stops...

 

Take it for a good run before doing simple tests outlined on this thread? That is not a very good idea. Best to see what it's doing, then take it for a run. Besides, there is no MOT or tax on the car according to the information posted.

its going to the mot station 2 moz to put it on there mot gas analyser will that give afr ?

its going to the mot station 2 moz to put it on there mot gas analyser will that give afr ?

 

Should do, in lambda terms.

Take it for a good run before doing simple tests outlined on this thread? That is not a very good idea. Best to see what it's doing, then take it for a run. Besides, there is no MOT or tax on the car according to the information posted.

 

If it was driving perfect only 8 months ago and now its just smoking a bit,

The oil pressure is fine, temperature is fine and no horrible noises whats it going to do...

If it was a worn ring the engine needs a rebuild, if its stem seals it will just smoke on start up, if its a turbo seal its going to keep smoking...

I work on cars too and in my opinion its smoking cause its sat for 8months and needs a good run i mean up the motorway or atleast a few miles.

The fueling is probably going to be wrong if the battery was off or gone flat at some point so will need a good drive to settle down...

If its insured book it in an mot station a few miles away and drive it there...

I know you know what your talking about with motors but if a car sounded ok was running ok and was only smoking after sitting for 8months i would check all the levels and drive it to see if it cleared up...

Mine does this if it sits for long periods, my car is 25yrs old so is not new and will likely be worn a bit which is causing the smoke on start up but if i use it often it doesn't smoke...

the car runs just fine and sound smooth I drove it round the block by mine today but never got out of 2nd wish I could take it for a long blast but has no bumper on no lights and no front wings

If it was driving perfect only 8 months ago and now its just smoking a bit,

The oil pressure is fine, temperature is fine and no horrible noises whats it going to do...

If it was a worn ring the engine needs a rebuild, if its stem seals it will just smoke on start up, if its a turbo seal its going to keep smoking...

I work on cars too and in my opinion its smoking cause its sat for 8months and needs a good run i mean up the motorway or atleast a few miles.

The fueling is probably going to be wrong if the battery was off or gone flat at some point so will need a good drive to settle down...

If its insured book it in an mot station a few miles away and drive it there...

I know you know what your talking about with motors but if a car sounded ok was running ok and was only smoking after sitting for 8months i would check all the levels and drive it to see if it cleared up...

Mine does this if it sits for long periods, my car is 25yrs old so is not new and will likely be worn a bit which is causing the smoke on start up but if i use it often it doesn't smoke...

 

The fuelling is going to be wrong because the battery was disconnected? No it isn't. ECU self-learning doesn't put the AFR completely out of whack so as to cause bore wash. If indeed that is the issue here. If it is over 25°C or 50°C (depends on the map) then it will be in closed loop if O2 sensors are working correctly, and should not be overfuelling to any serious extent.

 

I guess it depends which way round you approach things. If there is an issue with something, I investigate the issue first, diagnose it as best as possible, fix it if applicable, then test drive the car. I don't just drive and see if it clears. Same with flat spots/hesitation/misfires etc. Just because your car does something, it doesn't mean another car will behave identically. IMO, it's common sense to err on the side of caution, especially when trying to diagnose issues with other people's cars remotely. So, for the sake of a couple of simple tests, then no, I wouldn't recommend someone attempts to drive through issues just because my own car behaves one way.

 

Very simply: A car is smoking and the smoke is blue. The engine is ingesting oil. This lowers the octane rating of the fuel. Driving a smoking car is not advisable until you can determine what is the cause of the smoke.

Edited September 29, 201411 yr by Noz

ok plan is gas analyser tomoz then will change the pcv valves on idle the smoke is white ish but when I drove it it looked blue

If it's white on idle and has an acrid smell, oil is being vapourised. This is due to turbo oil seals.

 

If it's blue whilst driving, oil is being ingested by the engine. This is due to various reasons.

so if the pcv vales were at fault what colour smoke would you get.

Blue.

But working in a garage we cant strip down every car , or get that involved.

If a customer came in said his car was perfect he parked it up for 8 months and its puffing a bit of smoke but all levels are fine and no noises, then i would say it needs a run.

Its not puffing clouds out the back like a steam train, so the oil is going to be tiny or even sitting in the exhaust and needs to get hot to burn out.

I no nothing about rolling roads and getting really involved in fueling and tuning but i do know a tiny bit of blue smoke is not going to kill the car and lots of old cars smoke a bit,

Dan300zx sounds like his not a fitter and is going to pay money to a garage to do test when I'll bet it would clear in 10mins of driving.

What could possibly happen if a car sat for 8months that is going to cause this...

If it was bore washed really bad i would have thought it would spin over with no compression sound like cambelt snapped.

Or black smoke and i ment if the car was in self learn and his using an mot emissions test to tell then it might give wrong readings...

i wouldn't waste my money having it tested like that, on an mot machine...

well heres mu thoughts. if you have unpluged any leads up top id say that you could have a faulty or dodgey injector lead, if an injector isnt fireing stron and when it should yourll have a whitey bluey smoke comming out the back end. cas of unburnt fuel, and cas youve not used the car for eight mounths wont relise your running on five. cas your stationary. i would unplug check connections then try again. hope this helps

I have unplugged them one by one and got a change in engine note. so think there all ok I will hook up the conzult 2moz and see what that says. if that will be any use will do a comp test to in the next few days what psi should it make ? and were is the fuse for the fuel pump so can unplug it

But working in a garage we cant strip down every car , or get that involved.

If a customer came in said his car was perfect he parked it up for 8 months and its puffing a bit of smoke but all levels are fine and no noises, then i would say it needs a run.

Its not puffing clouds out the back like a steam train, so the oil is going to be tiny or even sitting in the exhaust and needs to get hot to burn out.

I no nothing about rolling roads and getting really involved in fueling and tuning but i do know a tiny bit of blue smoke is not going to kill the car and lots of old cars smoke a bit,

Dan300zx sounds like his not a fitter and is going to pay money to a garage to do test when I'll bet it would clear in 10mins of driving.

What could possibly happen if a car sat for 8months that is going to cause this...

If it was bore washed really bad i would have thought it would spin over with no compression sound like cambelt snapped.

Or black smoke and i ment if the car was in self learn and his using an mot emissions test to tell then it might give wrong readings...

i wouldn't waste my money having it tested like that, on an mot machine...

 

Like I said, different approaches to problem solving when it comes to cars. I cannot make any assumptions, therefore I do not. Especially not when there are tests to conduct beforehand. I do know, that driving a turbocharged car which is burning oil is not a good idea. I do not know enough about the car to offer anything other than cautionary advice. Simple, really.

 

 

well heres mu thoughts. if you have unpluged any leads up top id say that you could have a faulty or dodgey injector lead, if an injector isnt fireing stron and when it should yourll have a whitey bluey smoke comming out the back end. cas of unburnt fuel, and cas youve not used the car for eight mounths wont relise your running on five. cas your stationary. i would unplug check connections then try again. hope this helps

 

Unburnt fuel is not "whitey bluey". He says the car runs smoothly so safe to say it is firing on all six cylinders.

 

I have unplugged them one by one and got a change in engine note. so think there all ok I will hook up the conzult 2moz and see what that says. if that will be any use will do a comp test to in the next few days what psi should it make ? and were is the fuse for the fuel pump so can unplug it

 

I would be happy with 150+ psi, with no more than 14-15psi difference between cylinders. Not sure what the manual states.

 

Fuel pump fuse in the engine bay, driver's side. Fuse nearest the engine itself, it's labelled on the fuse box lid.

Edited September 29, 201411 yr by Noz

ok then will give it a go .

something I did notice is when you first start the car from cold there is no smoke . also noticed that some times one blows less smoke or no smoke for a little while the other is smoking there then they both start doing it very strange

DO YOU HAVE sorry a balence bar were the exhaust join up ,or are they compleatly separate like my old car, and you now said also no smoke when cold so almost will not be any wires bad connections then, but then smokes once warm on idel. then through both rear ends. i bet your exhaust joins up underneath.

If there's no smoke when first started, it's very unlikely to be the valve stem oil seals. I'm going for turbo oil seals. Definitely if the smoke burns your eyes when you stick your face next to the tailpipes :wack:

I just don't under stand how the seals can go on both sides at the first start up after the engine laying up.