Wondered if any one had any ideas?
Mate of mine has a 998 block with +20 pistons and a 12g202 head on it with a 1 1/2 su and LCB exhaust with maniflow rear silencer,
Just had it apart to change the head gasket as blew between 2&3, changed all the stem seals etc and put everything back as found it, only now it won't fire on 3&4,
Tested compression and have decent compression on all four,
Changed the plugs and leads and have decent sparks on all plugs, running an electonic dizzy from a metro.. Have checked the timing, reset tappets, checked the carb over and still have no ideas?!
Any body have any suggestions?
Many thanks
Joe
Not Firing On 3&4
Started by
jeo022
, May 22 2012 06:15 PM
10 replies to this topic
#2
minidaves
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Up Into Fourth
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Posted 22 May 2012 - 06:26 PM
got leads on right way?
#3
jeo022
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Mini Mad
Posted 22 May 2012 - 06:37 PM
Yeah, pretty sure, I've checked, checked and rechecked the leads!
#4
oltonlad
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Up Into Fourth
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Posted 22 May 2012 - 06:42 PM
if there is a spark at the plugs then it must be a massive air leak on that side of the inlet manifold............or the head gasket isn't sealed properly (i cant see it being that though)....is the servo pipe done up properly??
#5
jeo022
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Mini Mad
Posted 22 May 2012 - 06:59 PM
Servo pipe done up properly, will have to double check the carb again, although only changed the gaskets recently and was running fine prior!
Thanks
Joe
Thanks
Joe
#6
mk1leg
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Crazy About Mini's
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Posted 22 May 2012 - 07:06 PM
defo leads ot timing........recheck order of leads..............1-3-4-2 in anticlockwise rotation with No: 1 at rad end and 1-2 oclock on dizzy cap........ 
#7
jeo022
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Mini Mad
Posted 22 May 2012 - 07:08 PM
Have done leads and timing, sorry, its stumped me also!
#8
jaydee
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Crazy About Mini's
Posted 22 May 2012 - 07:40 PM
Standard camshaft and are you sure the dizzy drive has been put in th conventional position?
#9
Finnysmini
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Posted 23 May 2012 - 01:53 PM
This happened to me. Check the inlet manifold as it joins to the head. Mine had a tiny crack in it and the fuel was soaking into the gasket and was not reaching 1 and 2 cylinder on mine. You won't realise its cracked untill you take it off again. I've got a pic that I'll upload in a sec.
#11
Boomboy77
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Posted 23 May 2012 - 03:52 PM
Are you sure the valves are opening?? Could well have had a tappet stuck and you have adjusted from there?
Whip rocker cover off and spin engine over and make sure all valves open and close as expected.
From there I would check your leads are in right order and that 3&4 arent swapped over.
Are the plugs wet when you take them out of 3&4??
Whip rocker cover off and spin engine over and make sure all valves open and close as expected.
From there I would check your leads are in right order and that 3&4 arent swapped over.
Are the plugs wet when you take them out of 3&4??
Edited by Boomboy77, 23 May 2012 - 03:53 PM.
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