Was travelling along the A46 dual carriageway and got the chance to power away and a large plume of smoke came out the back end, 'Oh, dear!' I thought, 'I may have blown a turbo!' So kept the speed down, and didn't notice any problems with the engine in any way, so when i got to my destination I left her running and checked all round her. No oil leaks, no smell of burning oil from either zorst, but there was smoke coming from underneath her!

Anyway, that was the other week, I've had her up on ramps since then and, although we could see signs of oil, couldn't see anywhere that it might be coming from! But it is defo landing on the Cats, hence the burning.

Did the same journey this weekend and did the same again, big plume of smoke again, and then the smoke from underneath, which is defo a burnt oil smell!

Right, I've checked the oil levels, and the engine is fine, but the auto-box is high! But it must have been high since it was re-built last year.

So, is there any way that some of the auto-box oil is being frown out of the box under high load? (No signs of it coming out of the dipstick) I've checked out the engine as much as I can, and there isn't any real important signs of oil anywhere there.

 

All help appreciated. :bow:

Most likely cause is rocker cover gaskets leaking when driven hard and dropping oil directly on to exhaust thus leaving no leak just smoke. Do compression test as Si says but just pull out dipstick and see if it is breathing heavy ? ( smoke out of dipstick tube when running !)

...or take the oil cap off.

Cars not here but at garage...

So hopefully find out soon.

Thanks Si and Southwestzmech, looks like I could be doing a bit more investigation now :D

 

where are the other pipes located?

Any diagrams?

Just found this, hope it helps..... http://www.ttzd.com/tech/pcvtech.html

 

Also a bit more here >>http://www.300zxclub.com/showthread.php?t=41967&highlight=pcv

 

Don't forget both of these are LEFT HAND DRIVE!!

Will do mate.

 

Cheers Mate :)

Took it too the garage who put it up on the ramps.

Could see where oil staining had taken place on the drivers side of the car up by engine trailing back but no sign of a leak even after running the car for 20mins.

 

So by this i cant believe it could be the mains seal if the staining is on one side of the car.

 

So my mech reckons it must be a hose opening up on pressure on one side of the engine

 

All ive got to find out where!Im starting to wish it was the main seal-then at least i would know where it is!Does it ever end?

 

However put the other pcv hoses 9for addition to the valves i put on the other night.) on and no signs of smoke and old ones didnt seem blocked -though one pipe had the little metal plug with a hole inside in pushed round so it was side on!gets stranger by the hour lol.