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what would cause this SORTED

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Old 05-11-2005, 09:05 PM
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abdr500
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Default what would cause this SORTED

what would a cause a cossy to run on 3 cylinders on ideal and when reved it runs on 4 perfect
Old 05-11-2005, 09:06 PM
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leads breaking down?
plugs?
cap?
or head gasket leaking water into the cylinder
Old 05-11-2005, 09:07 PM
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DazC
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Ceramic centre electrode surround on the spark plug cracked and dropping down shrouding the spark possibly...

Take them out and hold them in their natural running position and see what happens....
Old 05-11-2005, 09:09 PM
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furry
i rebuilt the engine with new every thing apart from leads cap plugs or rotor but it does run on 4 but sounds like on 3 but when your driving its its runing perfect
Old 05-11-2005, 09:11 PM
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check/replace them then fella, cheaper then pulling the head off again.
Old 05-11-2005, 09:14 PM
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right .took all the plugs out and ther all dry and clean cap rotor and leads were new about 4 montha a go and looked mint .its defo number 1 cylinder .but plugs arnt wet .
Old 05-11-2005, 09:18 PM
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could the plugs off fucked up as they were still in the head when it was steam cleand and washed
Old 05-11-2005, 11:51 PM
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Burnt valve would cause a low speed missfire
Old 06-11-2005, 08:02 AM
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Champion C57's?
Old 06-11-2005, 10:24 AM
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Stu @ M Developments
nope i use 071
Old 06-11-2005, 02:22 PM
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i have a littel more info if i drive the car lets say for 30 min or go for a long drive its fine no misfire or nothing .even when idealing but once it gets cool it starts to get a littel misfire on idel. but its not like a misfire coz all 4 cylinders are working no coolent loss no oil buring and no high fuel consumption all 4 plugs are working leads are giving the spark injectors well i only just but in the light blues about 200 miles ago with the right chip rebuilt engine about 200 miles ago changed every thing
Old 06-11-2005, 02:37 PM
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Originally Posted by RS2300 4x4
Burnt valve would cause a low speed missfire
tell me about it, gets worse over time too
Old 06-11-2005, 02:41 PM
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b19bal defnatly not burnt valves as i hade it apart 2 days ago and replaced all valve guides and seals the rest looked mint .i think it must be a miss seated valve or the valve is staying open .coz its only should like its missing at 900 rpm as soon as you rev it its perfect
Old 06-11-2005, 02:44 PM
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Originally Posted by abdr500
furry
i rebuilt the engine with new every thing apart from leads cap plugs or rotor but it does run on 4 but sounds like on 3 but when your driving its its runing perfect
that is shocking!
Old 06-11-2005, 02:44 PM
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abs was actually talking about my escort csbrio runabout

i bought it 18 months ago with a burnt valve, keep meanimg to fix it but never bothered, its worse now

not everyone on here likes to have cheap digs mate
Old 06-11-2005, 02:46 PM
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essexrsturbo
what is shocking
Old 06-11-2005, 02:48 PM
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b19bal
no offence taken m8 just a littel stuck
Old 06-11-2005, 02:49 PM
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think hes talking about full rebuild yet keep the 8 quid rotor arm that always causes high rpm missfires
Old 06-11-2005, 02:51 PM
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b19bal
thers no high rpm misfire .at all .plus its not worth changing the cap rotor or plugs as i did so 2 weeks ago befor the rebuild so no point in changing agine spent silly money to as i changed all sensors to
Old 06-11-2005, 02:55 PM
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then its technically a new engine then
Old 06-11-2005, 03:19 PM
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If u KNOW its no1 thats missfireing then swap the plugs/leads around making a note of where u move them too.

If it then missfires on the cylinder u have moved the plug/leads to u know its 1 of them.

If it doesnt then u know its something else and go from there!
Old 08-11-2005, 08:37 PM
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SORTED
Old 08-11-2005, 08:42 PM
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And it was?
Old 09-11-2005, 07:16 AM
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all just a dream
Old 09-11-2005, 09:08 AM
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Stu @ M Developments
its gona sound stupid but changed the oil from 15/50 to 5/50 and its a dream must off been to do with the grade of oil it wouldnt allow the hydrolic lifter to fill up after the rebuild sounds stupid but it worked .thanks guys
Old 09-11-2005, 09:16 AM
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Lol
Old 09-11-2005, 11:57 AM
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Originally Posted by abdr500
Stu @ M Developments
its gona sound stupid but changed the oil from 15/50 to 5/50 and its a dream must off been to do with the grade of oil it wouldnt allow the hydrolic lifter to fill up after the rebuild sounds stupid but it worked .thanks guys
What make of oil are you using ?

Steve.
Old 09-11-2005, 12:05 PM
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5/50 valvoline fully synthetic
Old 09-11-2005, 12:06 PM
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Cheers

Steve.
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