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Model specific boards => Golf mk4 => Topic started by: gamestaffords on 31 March 2016, 17:31

Title: random cylinder misfire
Post by: gamestaffords on 31 March 2016, 17:31

Hi guys
 After some help please?? i changed the half moon and rocker cover gasket and in the process my breather pipes crumbled so i got a cheap replacement  set and i believe a pc valve? my car now runs poor and the idle is well not there lol..i have read up a bit and my guess is that valves not right..any thoughts?????
Thanks Ross

Title: Re: random cylinder misfire
Post by: Dalo Harkin on 01 April 2016, 08:55

got a pic of the pipes?

If you are getting a misfire, I would suspect that one of the coil packs harness isnt pushed in far enough or you have damaged the wiring to one of them (the wires get broken due to heat)
to test which one is knackered, start the engine and remove the harness at the back of the coilpack, the engine note should drop slightly, find the one that doesn't drop and that the culprit, if the wiring is ok and its all connected right, try swapping one of the coil packs over to check if its the coil pack or something else.

did you replace the spark plug gasket at the same time? its normally in with the set and stops the oil going down onto the plugs, if you do the above next step is to test the spark plug on that cylinder  :smiley:

Title: Re: random cylinder misfire
Post by: gamestaffords on 04 April 2016, 10:48

yea thanks i did replace that gasket but have also swapped the plugs but still get misfire on 4????
 

Title: Re: random cylinder misfire
Post by: Dalo Harkin on 04 April 2016, 17:01

have you checked the coil packs one by one?

Title: Re: random cylinder misfire
Post by: gamestaffords on 04 April 2016, 22:00

sort of lol,, swapped them round and still the same cylinder, also pulled the plugs out the coils 1 by 1 and all seem to be working