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Compression loss - what happenned?
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#1
 
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Compression loss - what happenned? -
02-16-2007
, 05:29 PM
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I left the trusty old cavalier at my father's house whilst I went on holiday for 2 weeks. I told him there was no need to drive or run it to charge the battery. However, when I returned he informed me that he had "run it for a few minutes to charge the battery", ugh. When I attempted to start it, it ran for 1 or 2 seconds then stopped. When cranking it again I could hear there was little or no compression on any cylinders. After several more cranking/rest cycles, I could hear compression returning to one or more cylinders, and eventually there was enough compression for the engine to start. It ran rough for a minute or so but eventually returned to normal and has been fine since. I suspected that condensation from the short period of idling that my father gave it could have corroded some of the exposed valve stems, causing them to stick temporarily. is this likely to be the case? cheers Paul. |
lifters.
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I left the trusty old cavalier at my father's house whilst I went on holiday for 2 weeks. I told him there was no need to drive or run it to charge the battery. However, when I returned he informed me that he had "run it for a few minutes to charge the battery", ugh. When I attempted to start it, it ran for 1 or 2 seconds then stopped. When cranking it again I could hear there was little or no compression on any cylinders. After several more cranking/rest cycles, I could hear compression returning to one or more cylinders, and eventually there was enough compression for the engine to start. It ran rough for a minute or so but eventually returned to normal and has been fine since. I suspected that condensation from the short period of idling that my father gave it could have corroded some of the exposed valve stems, causing them to stick temporarily. is this likely to be the case? |
the oil off the rings, so they don't seal properly. The suggested
solution is to remove the plugs, put a small amount of engine oil
directly into each cylinder, clean the plugs up of course, put them back
and try again.
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After several more cranking/rest cycles, I could hear compression returning to one or more cylinders, cheers Paul. |
#5
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Paul Andrews wrote: After several more cranking/rest cycles, I could hear compression returning to one or more cylinders, You can hear compression?.... |
I wondered what that was too!
--
Lin Chung.
[Paste ntlworld over the Water Margin to send a private e-mail.]
#6
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p.tnu5cyrqyuobwl@lucy:|
Not really, no. More likely all the oils drained out of the hydraulic lifters. |
--
Tunku
"end user" v. A command regrettably not implemented in most systems :-)
#7
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When I attempted to start it, it ran for 1 or 2 seconds then stopped. When cranking it again I could hear there was little or no compression on any cylinders. |
normal, or if you turned the engine over by hand you might hear the
compression leaking away on the compression strokes, but not the
compression or lack of while it is cranking at normal speeds.
--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk
#8
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Paul Andrews has brought this to us : When I attempted to start it, it ran for 1 or 2 seconds then stopped. When cranking it again I could hear there was little or no compression on any cylinders. You cannot hear the compression. You can hear it cranking faster than normal, or if you turned the engine over by hand you might hear the compression leaking away on the compression strokes, but not the compression or lack of while it is cranking at normal speeds. what I meant was that I could hear the starter motor turning faster than |
extra load on the starter motor due to compression strokes. Does that make
any sense of my original post, or are people just being pedantic?
Paul.
#9
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Harry Bloomfield wrote: Paul Andrews has brought this to us : When I attempted to start it, it ran for 1 or 2 seconds then stopped. When cranking it again I could hear there was little or no compression on any cylinders. You cannot hear the compression. You can hear it cranking faster than normal, or if you turned the engine over by hand you might hear the compression leaking away on the compression strokes, but not the compression or lack of while it is cranking at normal speeds. what I meant was that I could hear the starter motor turning faster than usual, without the normal speed (and hence sound) variations caused by the extra load on the starter motor due to compression strokes. Does that make any sense of my original post, or are people just being pedantic? Paul. |
Have you checked the cam belt and confirmed it is going round?
--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk
#10
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Paul Andrews wrote on 17/02/2007 : Harry Bloomfield wrote: Paul Andrews has brought this to us : When I attempted to start it, it ran for 1 or 2 seconds then stopped. When cranking it again I could hear there was little or no compression on any cylinders. You cannot hear the compression. You can hear it cranking faster than normal, or if you turned the engine over by hand you might hear the compression leaking away on the compression strokes, but not the compression or lack of while it is cranking at normal speeds. what I meant was that I could hear the starter motor turning faster than usual, without the normal speed (and hence sound) variations caused by the extra load on the starter motor due to compression strokes. Does that make any sense of my original post, or are people just being pedantic? Paul. Just trying to be clear on what you actually meant. Have you checked the cam belt and confirmed it is going round? |
car has been fine since.
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