I'm stumped Burning oil after Rebuild - Alfa Romeo Forum
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(Post Link) post #1 of 23 Old 08-01-11 Thread Starter
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I'm stumped Burning oil after Rebuild

This has me a little stumped now. Was running ok for about 30miles from fresh rebuild, but this morning noticed was burning oil, it seemed quite alot. On way home EML came on,
resulting fault codes were P0173, 77, 78...

Removed the plugs and they were black and wet (oily), looked into the cylinder and the top of the pistons were also wet (oily) all four.
No sign of oil before the the Throttle body so the oil must either getting into the system after the TB or up from the crank...

The engine has had a new set of rings, when it was fully rebuilt...
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Twin spark?

I had hellish problems with one getting the inlet gasket to seal (there are 2 types of gasket, and the older ones seem better) allowing variator oil to leak into the bores.

I also had problems with the exhaust manifold studs passing oil, although that presumably would go into the exhaust, not back into the cylinders...
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Did you do a top end re-build as well?? Did you hone the bores??
weird how its getting into all four..
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Yes, Sorry 2.0 TwinSpark...

I wont discount the inlet manifold gasket, but its all 4 pot's, and the studs on the exhaust manifold like you said would not be going into the bore...

I did a full rebuild top and bottom, i didnt hone the bores as the manufacturing honeing marks were still very prominent...

Also did a compresion test and with a warm engine i get
cyl 1 - 200psi
cyl 2 - 210 psi
cyl 3 - 200psi
cyl 4 - 215 psi

Last edited by biffa; 09-01-11 at 09:18.
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My money's still on the inlet gasket. All 4 of my pistons were oily it was passing that badly.

I eventually found one of the old-style composite ones, which cured it.
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Cool i'll get that off tonight...I hope it is a simple fix... You dont happen to have the part numbers?
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One of these, depending on your model...

FIAT ePER

From what I remember, the new (metal) version is the replacement for composite one so you might have to trawl ebay etc for someone with old stock...

Having said that, the compression type should work...so maybe I just did it wrong (too tight perhaps)...
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(Post Link) post #8 of 23 Old 10-01-11 Thread Starter
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Originally Posted by iainfm View Post
Having said that, the compression type should work...so maybe I just did it wrong (too tight perhaps)...
that could be the issue, i didnt torque it this time, i'll get a new gasket and go from there.
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Pulled the inlet manifold out this morning inlet pilenium was very oily, no sign of oil on the throttle body.

I pulled the inlet manifold gasket off and not really any evidence of oil on either side of the gastek or the mateing surfaces.
My conclusion is oil is getting into the inlet via the rear breather hose...
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overfilled with oil?
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Hmmm...that's a bugger. Were the valve stem seals changed during the rebuild?
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Hmmm...that's a bugger. Were the valve stem seals changed during the rebuild?
Yes, all 16...

Whats confusing me more is that there is no oil in the throttle body it's spotless

And also when ideling the breather on pipe before the TB sucks air in
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Can you not just isolate the breather and run it for a bit see what happens.. just vent it to atmosphere??

Also do you get exhaust smoke when you go from over-run to power on?? What oil you got in there??

Last edited by seadart; 12-01-11 at 06:52.
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(Post Link) post #14 of 23 Old 12-01-11 Thread Starter
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It appears i've found the issue (jury out untill i have done more mileage). The rear (post TB) breather has a valve which close's when the engine is running faster than idle the spring that operate's this valve had snapped ans was holding the valve open so when using the car the breather hose at the back was sucking all the time rather than just at idle...

I still have and idle issue but i think the oil consumption might be sorted, i'll try and organise some pictures (no internet at hope yet).
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Cool.

You might find the idle gets better once the excess oil has been burnt off the plugs etc...
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Cool.

You might find the idle gets better once the excess oil has been burnt off the plugs etc...
I swapped them for some cleaner ones i had kicking around, will get some newones once i'm convinced the oil issue has been fixed...
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The lambda sensor might be a bit manky now... Oil's not good for them, apparently, which could affect the idle.

Sounds like a good blast is on order!
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(Post Link) post #18 of 23 Old 13-01-11 Thread Starter
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It seems the MAF might be suspect, i havent been happy about the MAF for awhile now.
According to FiatECUScan the Air Temp is about 30ish degrees even thoug its about 10 outside...
New MAF and see where we go from there.
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My idle issue could it be a crank sensor issue?
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Quote:
Originally Posted by biffa View Post
It appears i've found the issue (jury out untill i have done more mileage). The rear (post TB) breather has a valve which close's when the engine is running faster than idle the spring that operate's this valve had snapped ans was holding the valve open so when using the car the breather hose at the back was sucking all the time rather than just at idle...

I still have and idle issue but i think the oil consumption might be sorted, i'll try and organise some pictures (no internet at hope yet).

If your idle is fast then it's the same valve. You don't say when you did to it after you found the snapped spring ...


You still shouldn't use a lot of oil from here as it's only vapour that is supposed to get through not litres of the stuff. ThE idea is it is recirculated and burnt off rather than escaping to the air as a pollutant (or ground!). If you are still getting through a lot of oil then you have a bigger problem ...
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Quote:
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If your idle is fast then it's the same valve. You don't say when you did to it after you found the snapped spring ...


You still shouldn't use a lot of oil from here as it's only vapour that is supposed to get through not litres of the stuff. ThE idea is it is recirculated and burnt off rather than escaping to the air as a pollutant (or ground!). If you are still getting through a lot of oil then you have a bigger problem ...
Sorry i forgot to update on the oil issue, its been sorted. It was the broken spring in the valve...

This morning i was really cold and starting the car was a real challenge and it was misfiring all the way work, once i arrived i pulled the plugs on the coil packs and No:3 had little or no effect i think the idle and mis fire is either a weak coil pack or a damaged injector (damaged when it was fitted on the old engine that threw a rod on 3).

Last edited by biffa; 18-01-11 at 23:53.
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**UPDATE**

Posted: 23 January 2011 at 10:19Ok this is still going through oil and i mean a lot, i checked it this morning and its gone through a ltr in about 40miles, and i don't think its all going out the back.

It cant all be going out the back because there is a little smoke but not a ltr of oils worth.

I have no oil patches on the drive, any suggestions???


Posted: 27 January 2011 at 01:22Smaky did you manage to sort out the one you have had inlet issues with? i tried a shorter spring and that has made things worse i put the correct spring back in and i'm back to leving a smoke trail again.

I'm going to change the inlet manifold this weekend and see if that helps i thing the issue is the VIM and it seem to affect pot 3, which happens to be the one that the rod went through on the old engine...


Posted: 28 January 2011 at 10:38I changed the inlet manifold and it rev's and idles alot better, and no oil at first (because it was clean) but its doing it again.
The only thing i reused from the old manifold was the high speed idle valve spring, i have now swapped i for the snapped old one which is half length and we will go from there...

I think what i'm struggling with is the amount oil that i seem to go through, there are no apprent leaks and the oil is getting into the inlet manifold...
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(Post Link) post #23 of 23 Old 02-02-11 Thread Starter
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OK got this sorted, still burning a little oil but i think its just residue left in the inlet pillenium.
This fix included (inthis order with reducing symptoms)

Fast idle breather valve spring (with a second hand one will get a new one) reduced oil usage.
Replaced inlet pillenium the original one was jammed 1/2 open, this improved idle and further reduced oil usage.
Replaced bank 2 precat lambda sensor, sorted idle and excessing exhaust vapour.

It has flat spots but i think that's either the broken airbox lid or a new MAF...

Soon for sale...

Last edited by biffa; 02-02-11 at 20:01. Reason: ssppellin
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