Hey guys, my old man just changed the spark plugs in his 86' n/a 6 vl wagon for the first time since he got it. Now he changed the plugs to some new champion plugs that suit 86-88vl n/a, now i use these plugs in my car all the time and have never had a problem. He changed them and kinked one of the leads, he put it back together and the car was missing really badly and had very poor accelleration (sp?) so he went and brought some new champion 8mm leads for it and replaced all of them just incase that was the problem. Now it still missfires at idle and till about 1500-1800rpm (not exactly sure, is a SL wagon without taco, i'm just going by the shifts my car does and where it sits with its taco so its as close as i can get <88 vl berlina>). After that the car runs fine. I checked all the induction piping as there isnt any leaks that i can feel/see. The afm is at the right oHMs aswell. Whats the go here?? could one of the new plugs be ****y?? the leads are brand new and all plugged in beautifully. It doesnt make sense, if you rev it hard it runs fine and smooth with adequate power, but as soon as it gets under 1500-1800rpm it missfires and pops a little, its like a lumpy cam kind of. Can anyone help us out?? the car has to do some travelling by wednesday and we'd like this ironed out straight away!! should we put the old plugs back in and see how it goes?? coz it never did that with the old plugs... what else could it be?? ush.

Id say its the gaps in the sparkplugs,they should be 1.0mm,and stay away from ****ty champion sparkies,stick with ngk ,and see how it goes.

yeah make sure he gapped them right, even if you accidently drop one it can alter the gap immensly..

my rb30 also does this help would be sweet Some original photos have not been recovered yet.

when he changed them he might have bro the ceramic coating on the plug and some may have fallen into the cylinder, if so it should burn up and be forced out of the exhaust valve but sometimes they get stuck in the valves.. just takes a while before the piston spits it out...

RECTIFIED!!! Thanx guys, the silly old bugger dropped the spark plug from 2nd cyl and closed the gap to nothing without realising it he put it in, so he found it and fixed the gap to 1.0mm, dropped the bloody thing again, lost it for 10 minutes in the engine bay, found it and had closed the gap again, had to open it back up to 1.0mm and now everything is sweet as. He says he really appreciates all your help and advice!! cheers guys ush