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Engine Running On 2 Cylinders


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#1 JonnyBMX

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Posted 07 September 2012 - 08:35 PM

so ive replaced my headgasket and put everything back on as usuall.... only to find that cyliders 3 and 4 are not firing, there is a spark on the plugs.

any one got any ideas? the headgasket appears to have sealed fine as no water has gone into the oil or gone missing from the radiator

thanks guys

#2 sonikk4

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Posted 07 September 2012 - 08:37 PM

Do a compression check to make sure all is well , then go from there.

#3 JonnyBMX

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Posted 07 September 2012 - 08:42 PM

yeh ill do that tomorrow i did notice after taking the head of for a second time ( i have used another new BK450 headgasket) that the inlet for those two bores (my mini is SPI) was really like "wet and black" where the other is nice and clean... not sure how this could have happened as the car was running fine b4 i changed the headgasket apart from watery oil ahah

#4 JonnyBMX

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Posted 08 September 2012 - 06:34 AM

Anymore ideas people?

#5 longbridge4life

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Posted 08 September 2012 - 06:59 AM

Might sound silly but check your firing order spark lead connections :)

#6 JonnyBMX

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Posted 08 September 2012 - 07:18 AM

Yeh I have em labelled up 1 to 4 :P

#7 Yoda

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Posted 08 September 2012 - 07:28 AM

Like Sonik said, do a compression test on all four cylinders. Did you reset the tappet adjusters correctly? and how do you know it is 3 and 4 not firing? by pulling the leads off the plugs?

#8 leroy26

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Posted 08 September 2012 - 07:28 AM

and gone from the radiator end first?

#9 Yoda

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Posted 08 September 2012 - 07:33 AM

Hang on a minute, are you not the guy who tried cleaning his engine with something abrasive like sand or scouring powder? This little bit of information should have been included in your opening post.

Come on Sonik, i think we know what the answer is here! see you down the pub?













(i know it was a wind up before you say anything)

Edited by Yoda, 08 September 2012 - 07:38 AM.


#10 JonnyBMX

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Posted 08 September 2012 - 01:22 PM

Awkwudly I did post saying I had done that I hadbt lol! Problem is now fixed anyways had compression, quite embarringly two of the rickets were the wrong way onto the shaft so wernt sitting on the valves correctly none the less all sorted

#11 Yoda

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Posted 08 September 2012 - 01:59 PM

Whats a ricket? i need to know so i dont make the same mistake in the future! I usually make sure my rockers are on right though, i assume thats similar LOL

#12 tiger99

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Posted 08 September 2012 - 03:24 PM

How did you manage that amazing feat? It is not normal to dismantle the rocker shaft assembly during routine maintenance or even a gasket change, only if the rockers and their shaft are worn. In quarter of a million miles in Minis and numerous head and valve jobs, plus a few failed gaskets, I don't recall ever dismantling the rocker shaft assembly as there was just no need.

#13 JonnyBMX

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Posted 08 September 2012 - 03:36 PM

There was a need the entire reason for changing the head gasket was due to the rockers being changed for 1.5.1 as I said all sorted now

#14 tiger99

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Posted 08 September 2012 - 03:56 PM

Yes, that explains why you would need to dismantle the rocker assembly, and the gasket would follow because you have to remove some of the head nuts to get the rockers off. I suspect that you had to fit alternative valve springs to suit the rocker ratio too.

Please do tell us how much more performance those rockers give you, once you have had it out on the road. I hear conflicting stories about what they achieve.

#15 JonnyBMX

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Posted 08 September 2012 - 08:23 PM

erm, i have a SC typhoon ECU which is going to be prgrammed to suit for now though the standard ecu is back on... seems to have sorted its self out after a few miles (which was to be expected) cars running beutifully now... on a side note just took the gearbox outa an ibiza to find that it was actually the driveshaft inner cage that had shattered lol! waste of time (y)!




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