Weber Issue
Posted: Fri Mar 10, 2006 10:48 am
Guys,
Had my car in my mates garage now for 6 months and still got problems. Car has had a new ignition (Lumenition), head had been pressure tested, new guides fitted, valves done etc. Great compression wet and dry. Just fitted new spacers and O rings as the spacers had holes in them where the O rings fit but still I have the same problem. The jetting in the webers has been confirmed as correct. I don't know the cam profile personally, but the cam clearances have been reset. I have receipts showing the cams show be 30/70 type.
OK, so what appears to be happening is this. The car has to be set up very rich to run, and when it is below normal operating temperature the car runs quite nicely, smooth progression off idle and up the rev range. As soon as the car gets close to operating temperature any acceleration at all causes the car to backfire and miss badly.
My mechanic friend has 30 years experience tuning cars, webers etc and knows what he is doing. He is stumped on this one though and our only thought is that there is an internal blockage in the progression side of the carbs.
As a bit of a background, the car has been sitting pretty much for 11 years - in heated storage and has only been driven about 1000 miles since in that entire time.
As for me, I am at the end of my tether and my wife who's car it is will shortly sever a part of my anatomy.. Our last resort appears to be to replace the Webers, however, if it comes to that, I will convert it to EFI myself as I have some experience in the area. My concern is that the fault is not in the carbs, but somewhere else and if I convert to EFI I won't be solving the problem. However it will give me a better idea of what is going on with a wide band sensor installed etc etc.
Sorry for the long post, but thoughts appreciated!
Cheers,
Neil
Had my car in my mates garage now for 6 months and still got problems. Car has had a new ignition (Lumenition), head had been pressure tested, new guides fitted, valves done etc. Great compression wet and dry. Just fitted new spacers and O rings as the spacers had holes in them where the O rings fit but still I have the same problem. The jetting in the webers has been confirmed as correct. I don't know the cam profile personally, but the cam clearances have been reset. I have receipts showing the cams show be 30/70 type.
OK, so what appears to be happening is this. The car has to be set up very rich to run, and when it is below normal operating temperature the car runs quite nicely, smooth progression off idle and up the rev range. As soon as the car gets close to operating temperature any acceleration at all causes the car to backfire and miss badly.
My mechanic friend has 30 years experience tuning cars, webers etc and knows what he is doing. He is stumped on this one though and our only thought is that there is an internal blockage in the progression side of the carbs.
As a bit of a background, the car has been sitting pretty much for 11 years - in heated storage and has only been driven about 1000 miles since in that entire time.
As for me, I am at the end of my tether and my wife who's car it is will shortly sever a part of my anatomy.. Our last resort appears to be to replace the Webers, however, if it comes to that, I will convert it to EFI myself as I have some experience in the area. My concern is that the fault is not in the carbs, but somewhere else and if I convert to EFI I won't be solving the problem. However it will give me a better idea of what is going on with a wide band sensor installed etc etc.
Sorry for the long post, but thoughts appreciated!
Cheers,
Neil