1st gear bucking

My 1984 911 bucks when I am forced to go slow (5mph)in 1st gear in stop and go traffic - otherwise it runs great. Anyone have any ideas as to the cause? New spark plugs 1,000 miles ago.
Thanks for your help.

I always thought that had something to do with the gears/differential and like slack or something in the gears that cause it to jerk at really low rpm. My bimmer did the same thing. And my SC does it but as soon as I feel it start to jerk I push in the clutch and start over. It isn't a constant problem...just when I coast at maybe 5 mph then tap the throttle briefly and try coasting again...(kinda hard to explain)...that's when it will buck a bit.


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Leland Pate

___79 SC Targa

I think Leland has hit upon the precise solution to a problem a 911 was NEVER designed to handle ... driving a constant 5 mph is DEFINITELY outside the envelope!!! If stuck in traffic, just allow the car ahead a decent 'lead' before using clutch and throttle, then coast a bit, and repeat the 'cycle' as required!

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Warren Hall
1973 911S Targa

Thanks for the help. I can live with it, as long as it is supposed to be that way. This is my first 911.

Don't worry about it.. my '85 Carrera does the same thing, also in reverse gear. If you're accelerating in those gears, its okay, but let up on the gas & you get that bucking (lugging). Is normal as the gearing isn't designed to have the car move that slowly. Use the clutch to coast more after acceleration.
Regards, jlex.

Also new owner of an 84 and it bucks wildly. Can't seem to think this is normal. Does it worst when warm. Had car in for service ($$ an many sensors replaced) and it was better but the bucking has returned. Does it have to do with the fuel shutoff switch on the throttle body?

Thanks in advance for any ideas.

Doug

This is normal for a 911? Whoohoo! That's one less thing to worry about. And I thought there was something wrong with my car. Now I can tell my passengers it's normal! Thanks guys!

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Jeff
1976 911S

The bucking is perfectly normal, although I've heard that some 911s are more prone to it than others...

Going from memory, in the handbook for my 1973 911T, it warns you to not go below 1800 RPM in any gear other than 1st (I assume that includes reverse also!!!).

This may be to prevent "lugging" but I suspect is also a "bucking get-out clause."

I also remember reading an article on 911s years ago. The journalist remarked that the factory test drivers he was with always seemed to be "one gear lower than necessary."

Moral - Never be afraid to rev a 911, and accept the bucking at very low speeds...

- roGER

Me too. I thought something was wrong and have been driving like you guys recommend to counter act the 'fault'. This is great to know this info! I was worried that using those revs just for tootling along around town was a bit indulgent....but it really does seem to prefer them.

Too much exposure to modern cars makes us think these noises and traits are wrong I guess.

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'72 911 TE

This "bucking" you all are talking about may be a combination of lean fuel mixture (for smog police) and clutch chatter. My car does none of that. I can let the clutch out slowly at idle and the car will creep down the road at a couple miles an hour. I have a fairly (2 yrs old) new clutch and CIS set on the rich side. Granted, this isn't much of an issue. Who wants to drive a 911 at idle speeds?