jay.jay
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Registered: 28th Dec 10
Location: Gloucestershire
User status: Offline
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My x16xe is producing blue smoke, but only when I let off the accelerator and the revs drop about 300rpm. It also does it on idle when the car is hot. Also, when coming back on the throttle there is also a bang before the smoke 
I fitted new rings 2000 miles ago, and the stem seals have been done. What else could be causing this smoke?
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jay.jay
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Registered: 28th Dec 10
Location: Gloucestershire
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Any one?
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andy_mk3
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Registered: 18th Dec 11
Location: Peterborough
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Will most likely be valve stem seals, when you let off the intake goes into a high vacuum which will 'suck' the oil through the inlet stem seals.
I've heard people having problems with pattern stem seals not lasting, and fitting genuine ones have been fine.
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jay.jay
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Registered: 28th Dec 10
Location: Gloucestershire
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Cheers for the reply mate, hopefully it sorts it when I put the better head back on, but the head that's on it now never produced any smoke whilst it was on the other engine so I'm confused?
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jay.jay
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Registered: 28th Dec 10
Location: Gloucestershire
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Update, cleaned out all the breather hoses today and they were all blocked with gunk  cleaned them up but still blue smoke on engine breaking, and also when I put my foot down from standing did a compression test and getting 180-190ish psi on all 4 cylinders, any one got any ideas? Can't be stem seals as I kno the ones on this head are fine :s
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johnhara1
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Registered: 19th Oct 06
Location: Newcastle upon Tyne
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Rings or Stem seals. Did you run it in properly when you did the rings and what oil do you have in at the minute?
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jay.jay
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Registered: 28th Dec 10
Location: Gloucestershire
User status: Offline
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It was run in for 1500 miles, first 20ish miles were bad ones though as the car had a horrible misfire due to a knock sensor problem
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jay.jay
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Registered: 28th Dec 10
Location: Gloucestershire
User status: Offline
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And it's got 10/40 semi synth in cause I can't put anything expensive in at the minute as it'll just burn it all
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shaunmods
Premium Member
Registered: 12th Mar 07
Location: Glascote, Staffordshire
User status: Offline
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Valve stem oil seals mate. Mine had exactly the same symptoms as yours. Smoked on idle if you left it long enough, then chucked it out when you pulled away, and on over run. Swapped the head for a fully rebuilt one and its been fine ever since!
[Edited on 14-03-2013 by shaunmods]
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Martin W
Organiser: South East
Premium Member
Registered: 10th Aug 09
Location: Welling, Greater London
User status: Offline
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valve stem seals , had exactly the same problem. my did it on overdrive too
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fattaff
Member
Registered: 28th Aug 10
User status: Offline
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i was always under the impression that the valve guides wear also ??? or am i wrong about this ? i thought it was a commom fault on xe engines
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f.p.e
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Registered: 23rd Feb 13
User status: Offline
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the guides are more prone to wear on the small block xe's due to the thinner stems.
are the plugs oiling up or are they ok? any chance a stem seal may of come off?
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