1998 945 2.3LPT lambda woes - Page 3

barkster1971 · Jan 20th, 2012, 19:13

Looks like the piston rings might be shot or the valves are knackered as that's quite low compression. Should be up around 175-190. How much oil you getting through? You said the plugs were black? Any blue smoke under boost?
Carl.

mylittletony · Jan 20th, 2012, 19:25

That much?? The figures I got are roughly 9bar, which I thought was about right given atmos pressure of 1bar and a compression ratio of 9-ish:1

Not losing any oil really, not a great deal of smoke - I haven't noticed any and I do occasionally look when booting it

I did test it cold, removing one plug at a time and cranking with the coil to distributor lead disconnected.

Couldn't find a figure online for the recommended pressure though...

A guy at work suggested tight tappets as a problem, could it cause this?

barkster1971 · Jan 20th, 2012, 20:18

If the tappets are tight it won't rev or won't rev freely. Did you see if there's any CO in the coolant?

mylittletony · Jan 20th, 2012, 21:30

Ok, it does rev ok-ish considering it's running badly... Do you mean carbon monoxide?? How do I check for that? Will check it in the daylight tomorrow...

barkster1971 · Jan 20th, 2012, 22:24

If you have a testing kit or take it down the garage they can do it in 10 minutes to see if the hg gone, turns yellow is carbon monoxide is present.

Jan 20th, 2012, 19:13	#21
barkster1971 VOC Member Last Online: Apr 27th, 2024 13:22 Join Date: Jun 2009 Location: Swineshead/Salford	low Looks like the piston rings might be shot or the valves are knackered as that's quite low compression. Should be up around 175-190. How much oil you getting through? You said the plugs were black? Any blue smoke under boost? Carl. __________________ new engine! new car!

Jan 20th, 2012, 20:18	#23
barkster1971 VOC Member Last Online: Apr 27th, 2024 13:22 Join Date: Jun 2009 Location: Swineshead/Salford	rev's If the tappets are tight it won't rev or won't rev freely. Did you see if there's any CO in the coolant? __________________ new engine! new car!

Jan 20th, 2012, 22:24	#25
barkster1971 VOC Member Last Online: Apr 27th, 2024 13:22 Join Date: Jun 2009 Location: Swineshead/Salford	Yes If you have a testing kit or take it down the garage they can do it in 10 minutes to see if the hg gone, turns yellow is carbon monoxide is present. __________________ new engine! new car!

Jan 20th, 2012, 19:25	#22
mylittletony Master Member Last Online: Apr 24th, 2024 15:38 Join Date: Oct 2011 Location: East Sussex	That much?? The figures I got are roughly 9bar, which I thought was about right given atmos pressure of 1bar and a compression ratio of 9-ish:1 Not losing any oil really, not a great deal of smoke - I haven't noticed any and I do occasionally look when booting it I did test it cold, removing one plug at a time and cranking with the coil to distributor lead disconnected. Couldn't find a figure online for the recommended pressure though... A guy at work suggested tight tappets as a problem, could it cause this?

Jan 20th, 2012, 21:30	#24
mylittletony Master Member Last Online: Apr 24th, 2024 15:38 Join Date: Oct 2011 Location: East Sussex	Ok, it does rev ok-ish considering it's running badly... Do you mean carbon monoxide?? How do I check for that? Will check it in the daylight tomorrow...

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