Hi to all, I have a VR6 which starts fine, no smoke but after about 10mins, or when warm has a slight misfire...Any ideas?? Thanks J
I would be inclined to think coil packs too. If they haven’t been replaced or not done for a while, I would put in a complete set of coils and plugs. Did this on my T5 and it was just under £150 for the parts (NGK) if you shop around and a couple of hours (you may need to clean up the plug seats).from my Corrado days I'd guess a hairline crack in the coil pack, or crappy HT leads. Assuming spark plugs are good and the correct ones - VR6 can be fussy about plugs.
Not sure if that would work. If the T4 V6 head is anything like my T5, the plugs are recessed almost 6 inches into the head and the tops of the coils almost seal the holes.Depending on what is failing, you might be able to pinpoint it.
Wait until its very dark, or in your garage if you have one, get the engine warm til it starts to misfire.
Then open bonnet and look for faint (usually blue) sparks around the sparkplugs, plug leads and coils.
You might also hear a cracking noise as it sparks.