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- Path: sparky!uunet!gossip.pyramid.com!pyramid!daemon
- From: pshyvers@pyrnova.mis.pyramid.com (Peter Shyvers)
- Newsgroups: rec.autos.tech
- Subject: Re: dirty spark plugs
- Message-ID: <183406@pyramid.pyramid.com>
- Date: 3 Sep 92 22:17:01 GMT
- Sender: news@pyramid.pyramid.com
- Reply-To: pshyvers@pyrnova.pyramid.com (Peter Shyvers)
- Organization: Pyramid Technology Corp., Mountain View, CA
- Lines: 31
- Originator: daemon@sword.eng.pyramid.com
-
- In article <1992Sep3.152926.2491@engage.pko.dec.com> sontakke@helix.enet.dec.com (Vikas Sontakke) writes:
- >
- >In article <92246.132941QXF1@psuvm.psu.edu>, <QXF1@psuvm.psu.edu> writes...
- >>I got some problem with my 82 Civic. The car runs well but the spark plug of
- >>4th cylinder gets dirty really quickly. The new plug got black and greasy only
- >>after 10 days when it was put on. I checked the compression, all cylinders were
- >>good, about 200 psi. Spark plug cable was also checked, no breakage was found.
-
- How long did you allow on the leakdown test?
-
- >>Could someone kindly give me some suggestions to fix this problem?
- >>Thanks in advance.
- >
- >Valve seal/guide are leaking. You might be able to see some blue smoke when you
- >first start it in the morning.
- Agreed. Just make sure that it\s not in any way a fluffy,powdery coating. If
- it's at all wet (give it a few minutes to air-dry in case it's fuel) then
- you're getting valve-guide leakage - the valves have abraded the sides of
- the passage that they follow thru the head. Oil seeps down between the
- valve stem and the "guide", or passage - or rather, it's drawn, given the
- intake manifold vacuum that's drawing the air/fuel mixture into the
- cylinder.
- >
- >Real solution is to fix the problem, but a spark-plug which is immune to oil
- >fouling can dealy the inevitable for a long time.
- >
- Not worth your time. The unburned fuel/oil is poisoning your catalytic
- converter and coating up your exhaust system. As the cylinder will
- inevitably contribute less power, the pause in power output causes wear
- and tear all thru the drivetrain.
- >
-