Does anyone want to give me the bad news about what gone Pete Tong this time, based on the video clip below? I've got a pretty good idea already...

 

When driving, I get clouds of dirty smoke and backfiring from the exhaust. And to cap it all, I've only just put the engine back in after fixing the big end bearings.

 

www.symatix.co.uk/300zx/ItNeverRainsButItPours.wmv

Bloody hell! Good job you moved the camera over for that last blip of the throttle! You would have melted the lens!!!! :eek:

 

Hope it ain't as bad as it looks. :(

Over fueling and running very rich!??

Over fueling and running very rich!??

 

:shock:

Could be...Lets hope so. :bow: ...Sounds like fuelling but OH SO SMOKEY!!!

Does it smell petroly or musky??? :confused:

Oil normally hangs about bit longer.

Tub seals....bit much 4 that really.

Hole in piston.... :smash: probably not as it sounds pretty smooth.Get it checked on Conzult.

Head Gasket...youd of lost water as well if you loosing that much oil i would of thought.

When you say just done bottom end...Did u do top as well and fit new valve seals???? :headvswal

 

 

Did u fit any at all??? :rofl: :rofl: :x:

 

Just avin a larf at ur expense.... :tongue:

 

So did u do top end???

 

Good Luck Bud...Always sad 2 C a Z in distress :cry:

Yes... very smokey! I'm pretty sure there is an oil smell to the smoke. Apart from that, the engine runs perfectly ok.

 

I was presuming turbo seals as the smoke doesn't appear blue so, if it is oil, I would guess it was added to the gases after the combustion chambers. And the flames and backfiring I would guess are caused by the oil burning in the hot exhaust/exhaust gases.

 

And the real pi55er. I only just put the engine back in! The turbos were fine when I took it out. I only did the bottom end of the engine. Didn't touch the top end as that was all fine. Although the engine did take a bit of a knock as I dropped it slightly (about 18 inches! Landed sideways on its mount luckily but also caught the turbo downpipe) But let's not go there as that all starts to get a bit embarrassing!

I'd stick to it running way too rich. Oil would not burn like that, thats defo unburnt fuel. Check that your fuel system for any problems.

take apart the left then the right exhaust near the front see where the oil or fuel is coming from? its a start

Yes... very smokey! I'm pretty sure there is an oil smell to the smoke. Apart from that, the engine runs perfectly ok.

 

I was presuming turbo seals as the smoke doesn't appear blue so, if it is oil, I would guess it was added to the gases after the combustion chambers. And the flames and backfiring I would guess are caused by the oil burning in the hot exhaust/exhaust gases.

 

And the real pi55er. I only just put the engine back in! The turbos were fine when I took it out. I only did the bottom end of the engine. Didn't touch the top end as that was all fine. Although the engine did take a bit of a knock as I dropped it slightly (about 18 inches! Landed sideways on its mount luckily but also caught the turbo downpipe) But let's not go there as that all starts to get a bit embarrassing!

 

dont forget mate iff it is over-fueling that much and ide tend to think it is then ide go easy on the throtle,your bores are takin a poundin there due to the fact that the oil is getting washed off the bore,so its a circle of doom--(too much petrol--no lubication--high revs--compression suffers.before you rev the conkers off it to try and clear its throat ide get the fueling side checked out--------good luck mate :cry:

Although the engine did take a bit of a knock as I dropped it slightly (about 18 inches! Landed sideways on its mount luckily but also caught the turbo downpipe) But let's not go there as that all starts to get a bit embarrassing!

 

OOOOOOOOoooooooooooohhhh...Drop kick :slap:

 

Might be crack in the block then but seein as you reckon its oil added after combustion its probably not.

 

If it was ur turbo downpipe then it would only be one side Scchhmmmokin....

 

Lets stick with the idea of over fuelling for now.....

Soooooooooooo much cheaper 2 fix

 

Mind you...if its Tub seals then :nana2: New tubbies please...good time to upgrade :D

 

Post the soloution when you know...im intreaged :confused:

Well from what that looks like I would deffo go for fuelling!-don't sound that bad but the flames are deffo unburnt fuel!-why it's getting there is the question????-I would start with a check-over every thing you removed/undid

then get it Conzulted bud. ;)

Well from what that looks like I would deffo go for fuelling!-don't sound that bad but the flames are deffo unburnt fuel!-why it's getting there is the question????-I would start with a check-over every thing you removed/undid

then get it Conzulted bud. ;)

 

 

Could it be related to the O2 sensors, you sure you connected 'em back up :x: :D Funny how it's smoking outta both sides..

 

cheers Jon. ;)

The engine ran fine for a week after putting it back in. This is something that just started to manifest itself yesterday. All sensors are connected and not indicated as errors on the ECU fault readout.

 

The smoke comes out of both exhausts presumably because of the connecting pipe just before the back boxes. It appears to be worse out of the driver's side one so I'm guessing that's the side with the problem.

seemed to get worse as it boosted. have you had/got a blocked return pipe to your fuel tank? seems like way too much rail pressure? just a thought. hope its an easy fix.

The smoke comes out of both exhausts presumably because of the connecting pipe just before the back boxes. It appears to be worse out of the driver's side one so I'm guessing that's the side with the problem.

 

Please look at my first post, that would tell you one way or another :slap:

The engine ran fine for a week after putting it back in. This is something that just started to manifest itself yesterday. All sensors are connected and not indicated as errors on the ECU fault readout.

 

The smoke comes out of both exhausts presumably because of the connecting pipe just before the back boxes. It appears to be worse out of the driver's side one so I'm guessing that's the side with the problem.

 

Hi Mike,

 

Since rebuilding the engine, have you added or changed anything else? e.g a new chip and / or more boost??

 

It does seem strange since you state that the engine ran ok for the first week before the problem came to light.

 

I'd guess something electrical. The trouble with these aging crispy wiring looms is that they sometimes really cause trouble after being disturbed, and taking the engine out means every single connector has been moved.

 

Check list:

Have a look to see if there's oil in the throttle bodies - hopefully not

Check PCV's are closing fully

Check PTU connections - especially the coil pack side connector

Borrow a ConZult!

 

Hope something here is of help!

COLT, yeh I agree mate. Haven't had the time or the inclination to go and look at it yet though! Good place to start though.

 

WillyEd, nah not added anything else. And the ECU checks out ok with no fault codes.

 

I've clamped the PCV lines to stop oil entering that way and it makes no difference. And the smoke definately smells oilly.

 

I know the flames are a bit dramatic but would fuel problems really cause that much and colour of smoke? I'm really thinking turbo seals.

COLT, yeh I agree mate. Haven't had the time or the inclination to go and look at it yet though! Good place to start though.

 

WillyEd, nah not added anything else. And the ECU checks out ok with no fault codes.

 

I've clamped the PCV lines to stop oil entering that way and it makes no difference. And the smoke definately smells oilly.

 

I know the flames are a bit dramatic but would fuel problems really cause that much and colour of smoke? I'm really thinking turbo seals.

 

Two Words....Baggins/ZTECH

 

Hes bound to have an idea....knows his stuff.

I would have thought if it was the seals it would be worse on idle but yours is worse under revs, if its was oil i doubt you would be flaming so deffo fuel.

 

Try another chip in it and see if it makes a difference to the fueling??

 

Kirbz

Hi all

 

I've not looked at the car for well over a month as I bought a second car as a run around (P Reg Astra 2.0). The other car's been trouble free and cheap, and as I've got a one year old baby boy, I'd used up all my favours with the other half when I did the work on the Zed in January.

 

However, this weekend, I did a couple of hours on diagnosing it properly, before I remove the engine again. I took the angle-grinder to the exhaust and removed the connecting tube from the h-pipe, then welded stainless steel plates over the resulting holes. I'd got fed up with finding it hard to diagnose which bank/turbo was causing problems as the h-pipe effectively made it into one exhaust. And I've heard very little evidence that systems with the h-pipe perform that much better than those without. And I'd rather have a troublesome car that's easier to diagnose than have the benefits of the h-pipe. And if it does turn out to be really sh1t later when it's working again, I can always add another h-pipe connection.

 

And the result? Now I get huge clouds of smoke and flames out of the drivers side exhaust only. These occur when revving hard, not on overrun. Oh, and the driver's side pipe is full of oil. The passenger side pipe has oil from the old h-pipe connection down to the back box, and is perfectly clean upward of that.

 

Any new diagnoses from anyone? I'd find it very hard to bet against rear oil seal failure of the driver's side turbo.

Hi all

 

I've not looked at the car for well over a month as I bought a second car as a run around (P Reg Astra 2.0). The other car's been trouble free and cheap, and as I've got a one year old baby boy, I'd used up all my favours with the other half when I did the work on the Zed in January.

 

However, this weekend, I did a couple of hours on diagnosing it properly, before I remove the engine again. I took the angle-grinder to the exhaust and removed the connecting tube from the h-pipe, then welded stainless steel plates over the resulting holes. I'd got fed up with finding it hard to diagnose which bank/turbo was causing problems as the h-pipe effectively made it into one exhaust. And I've heard very little evidence that systems with the h-pipe perform that much better than those without. And I'd rather have a troublesome car that's easier to diagnose than have the benefits of the h-pipe. And if it does turn out to be really sh1t later when it's working again, I can always add another h-pipe connection.

 

And the result? Now I get huge clouds of smoke and flames out of the drivers side exhaust only. These occur when revving hard, not on overrun. Oh, and the driver's side pipe is full of oil. The passenger side pipe has oil from the old h-pipe connection down to the back box, and is perfectly clean upward of that.

 

Any new diagnoses from anyone? I'd find it very hard to bet against rear oil seal failure of the driver's side turbo.

 

Try pulling the spark plugs from the drivers side bank and check for fouling,that will tell you if the prob is internal or external,if these are o.k. then I would go for turbo seal.

see in your sig they are turbo technics?-been some sorry things said about these!

Good Luck!

pull the plugs out on the drivers side, if you get an oily one, the problems with oil getting in the bores, if its sooty, there might be a fueling problem, but if your saying the exhaust is oily...

at least if all the plugs are normal then you may be safe to assume the oil is entering out of the cylinders ie turbo side.. or if you only get one dodgy plug then youv identified the problem cylinder.

i hope youv de-catted or they'll be goossed!

thats wierd u must have written that exactly when i did

Lol

thats wierd u must have written that exactly when i did

Lol

Spooky......................... :wack:

it MUST be a good idea then

Plugs are fine. Did a compression test and all six cylinders are similar. They all read slightly on the low side however, but I think that may be down to a badly calibrated Harry Halford's guage.

Plugs are fine. Did a compression test and all six cylinders are similar. They all read slightly on the low side however, but I think that may be down to a badly calibrated Harry Halford's guage.

 

 

turbo