Iain M
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Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
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Car is fireing on 3. Did a compression test and compression is 200lbs in 3 cylinders. In number 2 cylinder it wavers, for example - test it gives a read of 90lbs then up to 140 then test again 180 then test again drops back down to 90. Is this a sticky valve or we talking a piston ring going. If its the piston ring then surely it would smoke its tits off and it doesn't.
I am at a loss, Any one know
Cheers
[Edited on 18-10-2007 by Iain M]
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Iain M
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Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
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Any body
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Limecat
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Pass?
200PSI is about factory figures, thats what my old C16XE made.
I assume you are doing it with all the plugs out, at WOT and cranking until the needle doesn't move anymore?
If the test is being done right there is nothing for it but to pull the head off, just getting the upper plastic inlet manifold off is an utter arse due to access to the rear of the throttle body! 
[Edited on 16-10-2007 by LETGSI16V]
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Iain M
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Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
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I don't do the test the garage where the car is did the test - i was wondering did anybody have an idea as to what it could be.
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Dave A
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get a leakdown test done, that will show the true compression loss and the cause all in 1 go.
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Iain M
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Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
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Cheers Dave. They just phoned me now and they are in the process of taking the head off as we speak, then they are gonna give me a call and let me know the damage.
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Dave A
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WHY TAKE OFF THE HEAD WITHOUT DOING THE CORRECT DIAGNOSIS WORK FIRST????
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dan_c4rsa
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Location: North Yorks Drives: MK3 Seat Cupra
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cos they can charge more 
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Jake
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Registered: 24th Jan 05
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maybe the thing isnt holding compression because the area that the bit sits in around the top of the spark plug hole is dirty so isnt holding an air tight seal
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Iain M
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Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
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quote:
Originally posted by Dave A
WHY TAKE OFF THE HEAD WITHOUT DOING THE CORRECT DIAGNOSIS WORK FIRST????
I have no idea Dave Sorry. Just saying what they are doing thats all.
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Iain M
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Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
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Insulation tape found on cylinder 2 in the head. Nothing else wrong.
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Dave A
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Registered: 10th Dec 03
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what??? insualtion tape in the head
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Iain M
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Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
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Yes Dave Insulation tape was found stuck to the head at the side of cylinder 2. Have a look at GC its all there
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Limecat
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That wouldn't cause a loss of compression though, plus it would soon get nuked during combustion.
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Richardhhha
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Registered: 29th Sep 07
Location: Croydon, Greater London
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might be the rings trying to align themselfs. seen it before on some fords havnt seen it on a vauxhall tho
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Iain M
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Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
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there was a slight gap between head and gasket.
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Dean_W
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Registered: 13th Dec 05
Location: Downham Market, Norfolk
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quote:
Originally posted by Richardhhha
might be the rings trying to align themselfs
Whats that?
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Iain M
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Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
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your guess is as good as mine
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Vaux Lad
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WTf, tape put on the headgasket? LOL
Has the gasket blown or something and someones stuck some tape on hoping to fix it?
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Iain M
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Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
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Fuck knows mate all as i know is that when they took the head off next to number 2 cylinder was insulation tape stuck to the head.
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Richardhhha
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rings lining up is very common on bike engines
its where the 2 compression rings align there gaps you know you got to stagger the rings to keep compression well they can sometmes mov and align with each other causing loss of compression.
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Richardhhha
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Location: Croydon, Greater London
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quote:
Originally posted by Iain M
there was a slight gap between head and gasket.
wouldnt that indicate a warped head?
what they going to do skim it?
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Limecat
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quote:
Originally posted by Richardhhha
rings lining up is very common on bike engines
its where the 2 compression rings align there gaps you know you got to stagger the rings to keep compression well they can sometmes mov and align with each other causing loss of compression.
I have never taken a high mileage engine apart that doesn't have the gaps inline.
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Iain M
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Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
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Yeah they are going to skim it and pressure test it then new gaskets all round and then new cambelt rollers and tensioners and new oil and what not.
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Iain M
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Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
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Well another update. 2 slightly bent valves
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