Martin ford 0 Posted June 21, 2021 Report Share Posted June 21, 2021 Ive recently bought myself a 2.8 vr6 mk³ golf highline I bought the car wiv spark plug issues I've replaces the coil pack the ht lead and plugs Started the car with all new bits on started lovely running like a dream took it up.the Road for a test drive . When I come back car sounded different so checked and is now only firing on 5 any help please Link to post Share on other sites
Philly-R6 28 Posted June 21, 2021 Report Share Posted June 21, 2021 Hi Martin, Do you know which spark plug isn't working? You could disconnect each plug in turn from the coil pack and the one that makes no difference is the one to investigate. The problem could be: - one of the spark plugs - maybe it has a cracked body or the gap not set correctly? - an iffy lead (unlikely) - an iffy contact between the plug and lead, or lead and coilpack (more likely - it worked until normal vibration made the connection loose?). - the coilpack (unlikely) - the spark plugs work in pairs You could remove each spark plug in turn (ground the metal part to the engine and crank the engine over. You should see each one spark clearly. Don't go buying replacement parts until you understand the problem and can prove it to yourself. Let us know how you get on. Have fun! Link to post Share on other sites
Martin ford 0 Posted June 21, 2021 Author Report Share Posted June 21, 2021 Yh I've found which one isn't working it's on the bottom row 2nd to the right think it's number 4 well that's the number from coil pack I have replaced all ht leads new coil pack but I haven't replaced the plugs Link to post Share on other sites
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