When I let off my throttle, my car jerks really hard. ANd when I get back on it, it jerks again. REALLY annoying. Any suggestions?

 

I have the same problem, I always thought it was just slack somewhere in the tranny, driveshaft, or diff.

Im probably not right though, does anyone know for sure, I would like to fix this (in my next car)

 

not slack. it could be a bad engine or trans mount. give the engine a tug. if it moves excessively, you hasve your problem. also, you can visually inspect the mounts or breaks or splits.

 

No, it feels like the carb is just giving or cutting off gas too abruptly.

 

Your dashpot might not be working properly. This is what keeps the throttle from snapping closed real fast. That would explain the jerking while letting off, but not while getting on the gas. Not too sure.

 

Nah, I dont use a dsahpot, and I dont have this problem. Sounds more like a driveline problem to me, or maybe ignition timing or shutter valve.

 

I'd put money on that one.

 

Ok, now we got the carb gods disagreeing with each other. This should be good.

I am quite stupid when it comes to carbs. But I am learning. Basically, the dashpot creates resistance when the throttle hits the dashpot's plunger, usually right before closing. This is only used on manual transmission cars though. Its mainly to create a smoother transition between part throttle and no throttle, so it isn't instant. This is just the way I see it, and if you think about it, I could be right with my previous post.

 

Your lucky I dont drink Irish Whisky.

 

Right. So where is the dashpot, and how do I fix it?

 

I don't know of a way to fix it either than getting a new one. But it is on the rear of the carb when it is on the car. I can get a pic for you in a little while.

 

Mmm-Hmm.
Next time I'm gonna want something more expensive than Glenfiddich!


The dashpot is at the very end of the right side of the carb (unless some's removed it). There's a big metal "toungue" on the linkage, last piece on the primary shaft, I think. This makes contact with the white plastic piston at the bottom of the pot.
It's adjustable.

I don't run one, and we don't put them on Sterling Carbs.

 

Sounds more like a driveline or motor mount problem than a carb problem. Grab the driveline and give it a twist and see if the u-joints (or even the ring and pinion) have slop.

Oh, and The Glenfiddich=pedestrian.