Gary, sorry about the late reply. The new 2carpros website is not sending me topic update notifications!
It's hard to say (over the internet) what the real cause is (without actually driving / feeling it myself. Yes, fuel / air mixture issues can cause driveability
symptoms that could feel like clutch chatter. But if your engine is running as smooth as it is, I can't see that being the case then.
However, if the choke does provide enough of a difference, then it may very well be a fuel mixture issue that does not like first gear too much.
Old CIS Fuel Injected engines are quite "air leak" sensitive, that would cause similar issues in the lower gears. As the engine torqued back when first
starting off, the air hose would stretch and an opening would develop. That opening would then drop the Fuel Metering Plate and the vehicle would
jerk / buck. In the higher gears, the hose would not stretch and no bucking would be felt.
Keep hunting, sounds like you are doing a great job in tracking this down! A clutch (in my neck of the woods) usually lasts from 97K km to 180K km
(depending on who's driving).
An old pressure plate may not be able to transfer the power through the disc in first, but have no problems in the upper gears.
Sunday, October 28th, 2012 AT 4:58 AM