[HermanL]

so i have been having this problem for awhile, my car jerks pretty bad when i let off gas in low gears, it was embarrassing when i went through stop and go traffic with car jerking like crazy. jerking decrease as i went into high gears, but 1st and 2nd gear is just bad. i took it to dealer two weeks ago, at first i asked my SA if this is normal, he said no; then after i got my car back, and of course he told me they didn't find any jerking, and then he told me that this is somewhat normal if you let off gas, WTF?! every time i let off gas in 1st and 2nd, to give you an idea how badly it is, it jerks almost exactly like downshifting to 1st/2nd without rev matching at 30-40mph. so he is telling me this is normal?? no wonder why people prefer auto over manual then. i brought it in for brake squeaking, jerking and bad gear lever, they manage to fix none of the problem and return my car. anyway i am taking the car into dealer next week and also i have been search for possible cause, most people i asked thought i have bad engine/tranny mount, some suggested spark plugs or even slipping clutch. what do you guys think? appreciate for any input.

[46m3csl]

Cant be the clutch bro, could be the mounts, mines jerks if i let off the throttle really quickly in first in the higher rpms

[tibra1]

Originally Posted by HermanL

so i have been having this problem for awhile, my car jerks pretty bad when i let off gas in low gears, it was embarrassing when i went through stop and go traffic with car jerking like crazy. jerking decrease as i went into high gears, but 1st and 2nd gear is just bad. i took it to dealer two weeks ago, at first i asked my SA if this is normal, he said no; then after i got my car back, and of course he told me they didn't find any jerking, and then he told me that this is somewhat normal if you let off gas, WTF?! every time i let off gas in 1st and 2nd, to give you an idea how badly it is, it jerks almost exactly like downshifting to 1st/2nd without rev matching at 30-40mph. so he is telling me this is normal?? no wonder why people prefer auto over manual then. i brought it in for brake squeaking, jerking and bad gear lever, they manage to fix none of the problem and return my car. anyway i am taking the car into dealer next week and also i have been search for possible cause, most people i asked thought i have bad engine/tranny mount, some suggested spark plugs or even slipping clutch. what do you guys think? appreciate for any input.

Switch to ur OEM DVs to Forge Diverter valves

[JuppiOne]

I assume you have a manual? not auto?
if you let go the gas in 1st or 2nd with the clutch engaged, thats normal, if you are in higher rpm range, if you let go the gas abruptly and without disengage the clutch, you will be jerking like crazy.

[HermanL]

Originally Posted by 46m3csl

Cant be the clutch bro, could be the mounts, mines jerks if i let off the throttle really quickly in first in the higher rpms

not even at high rpm, it jerks even at 1k5-2k...i don't even want to drive every time i think of the jerking...

[landau88]

I think its just the 335i's gearing or something. I have the steptronic transmission and whenever I'm in Manual Mode in gear 1 or 2 this happens to me too. Anytime I'm coasting in 1 or 2, as soon I as let off the throttle, my car jerks violently -- enough for every passenger to notice. Weird.

[HermanL]

Originally Posted by patrickch

I assume you have a manual? not auto?
if you let go the gas in 1st or 2nd with the clutch engaged, thats normal, if you are in higher rpm range, if you let go the gas abruptly and without disengage the clutch, you will be jerking like crazy.

not at high rpm,under 2k, and even i let off from 10% of throttle it jerks like crazy, worst at 1st and yes i have a manual

[HermanL]

Originally Posted by tibra1

Switch to ur OEM DVs to Forge Diverter valves

Sorry if this is a dumb question, but how is DV related to jerking?

[Syndicategt]

Originally Posted by HermanL

Sorry if this is a dumb question, but how is DV related to jerking?

It's not.

OP, reset your adaptations and see if that helps.

[HermanL]

Originally Posted by Syndicategt

It's not.

OP, reset your adaptations and see if that helps.

I reset throttle adaptation before, it didn't help, thanks for the advice though

[Syndicategt]

Originally Posted by HermanL

I reset throttle adaptation before, it didn't help, thanks for the advice though

If you have a PROcede you can reset your transmission/brake adaptation too.

[tibra1]

Originally Posted by HermanL

Sorry if this is a dumb question, but how is DV related to jerking?

What ur describing let off the throttle and getting jerked could be related to the boost being dumped too suddenly from the OE valves..ur problem is so abstract it may be this or 10 other things...i threw this out as smthg to think about.

[smallseafishie]

You made the same post back in early April...

Gears are short. They're going to jerk if you let off the gas quickly. Learn to modulate your gas pedal for a slower release.

Go test drive another 335i manual. I'm thinking you'll find that it'll be the same.

[iSCRAPE]

i had the same experience OP, getting a cdv delete i felt helped a lot.

[HermanL]

Originally Posted by tibra1

What ur describing let off the throttle and getting jerked could be related to the boost being dumped too suddenly from the OE valves..ur problem is so abstract it may be this or 10 other things...i threw this out as smthg to think about.

hmm....because i get pretty bad jerking even at light throttle, so i guess there isn't much/any boost when i let off throttle, hence not dv then? does this make sense?

[HermanL]

Originally Posted by e92power

i had the same experience OP, getting a cdv delete i felt helped a lot.

modified cdv installed for about two weeks, not much improvement regarding this issue, thanks though

[tibra1]

Originally Posted by HermanL

hmm....because i get pretty bad jerking even at light throttle, so i guess there isn't much/any boost when i let off throttle, hence not dv then? does this make sense?

does the jerikness happen just when shifting or if in the same gear and just pedal modulating?..the guy above has said that these cars will jerk a lil b/c of the "drive by wire" throttle system..if u r getting jerks when shifting esp on the 1-2 a modified CDV or CDV delete will def help

[HermanL]

Originally Posted by smallseafishie

You made the same post back in early April...

Gears are short. They're going to jerk if you let off the gas quickly. Learn to modulate your gas pedal for a slower release.

Go test drive another 335i manual. I'm thinking you'll find that it'll be the same.

yeah, I have been trying to convince myself this is normal till i drove my buddy's m3, lol it doesn't jerks at all with same driving style, as i stated, it jerks even i ease off from 10% throttle.

[HermanL]

Originally Posted by tibra1

does the jerikness happen just when shifting or if in the same gear and just pedal modulating?..the guy above has said that these cars will jerk a lil b/c of the "drive by wire" throttle system..if u r getting jerks when shifting esp on the 1-2 CDV delete will def help

not shifting, just pedal modulating...i wouldn't think it will be a big deal if it jerks a little, as i said it jerks like downshifting into 2nd, dump the clutch without rev matching. have modified CDV installed and shifting is much smoother, but jerking when let off gas wouldn't go away

[bolty]

Couple of questions:

1. How long have you been driving stick?
2. At what rpm are you letting off the gas when you feel the car jerk?

[tibra1]

Its very tough to give advice over the internet w/o seeing the problem.. u may want to examine the drive by wire..throttle sensor..MAYBE an issue there

they sell a Sprint Booster Drive by Wire upgrade..u may also wanna look at

http://www.bavauto.com/fland.asp?par...urce=SBBM0001S

[JuppiOne]

how many miles you have on your car? are you the original owner, it could be your clutch is warped. do you launched your car much?