I run a standard 1978 260Z except that it has 240Z carbs fitted.
It has always started easily on choke, and I generally find that even on a cold morning, by the time I have driven off my housing estate I can knock the choke off completely and it runs very sweetly even before the temp gauge shows it has fully warmed up.
But in the last week or so a problem has developed.
It starts on full choke, but runs very rough with the rev counter needle bouncing around. I can drive away but it feels like it is running on 5 cylinders.
After I knock the choke off the problem continues, with it misfiring until I get it past 3000revs when it then pulls.
Even when the temp needle reads normal, so it is fully warmed up, the lumpy running continues for another mile or so - then, mysteriously, it clears and the car runs beautifully.
I thought it might be dampness around the plugs, which is drying out as the car warms, so I sprayed the plugs and leads with a bit of WD40. The following morning it ran ok! So thinking I had solved it, I then purchased some conductive grease to do the job properly and put that round the plugs and into the leads. It continued to run well all that day . . . but next morning the problem had returned!
Taking it to let Mark Warburton have a look later this week, but wondered if anybody had any helpful thoughts on this?
It has always started easily on choke, and I generally find that even on a cold morning, by the time I have driven off my housing estate I can knock the choke off completely and it runs very sweetly even before the temp gauge shows it has fully warmed up.
But in the last week or so a problem has developed.
It starts on full choke, but runs very rough with the rev counter needle bouncing around. I can drive away but it feels like it is running on 5 cylinders.
After I knock the choke off the problem continues, with it misfiring until I get it past 3000revs when it then pulls.
Even when the temp needle reads normal, so it is fully warmed up, the lumpy running continues for another mile or so - then, mysteriously, it clears and the car runs beautifully.
I thought it might be dampness around the plugs, which is drying out as the car warms, so I sprayed the plugs and leads with a bit of WD40. The following morning it ran ok! So thinking I had solved it, I then purchased some conductive grease to do the job properly and put that round the plugs and into the leads. It continued to run well all that day . . . but next morning the problem had returned!
Taking it to let Mark Warburton have a look later this week, but wondered if anybody had any helpful thoughts on this?