Hesitation in 2nd gear, Tip mode...

Stoney · 07-26-2001, 11:53 AM

I've noticed a reproducible problem:

In Tip (manual) mode, at moderate throttle, after it shifts itself into 2nd gear, and as RPMs rise to about 2500... I observe the RPMs drop slightly (as if the car is about to shift into 3rd gear, but of course it doesn't). Power drops off briefly.

I can't think of any explanation for this. The car is nearly new. Using 91 octane gas.

That hesitation is problematic when trying to merge or pass.

Jim Selders · 07-26-2001, 01:38 PM

you'll see revs drop a little as it locks, and if the revs are low then performance upon acceleration suffers a small amount too, until the transmission unlocks and downshifts.

Jim

Bollinger · 07-26-2001, 10:31 PM

At least it isn't supposed to. I'd verify that it is before complaining. My guess is that the TC is just "catching up" and getting down towards 1:1, although not locking.

It is probably normal and you just need to hit the pedal harder. Then again, maybe not.

I think the real problem is that the gearing on the 4.2 is ridiculously low. In my 2.7T I never hit 2nd when passing (it's rare I hit 3rd!) and if I does my neck snaps back viciously.

Stoney · 07-26-2001, 10:48 PM

I've tested dozens of times. It always happens in tip mode... as the rpms rise in 2nd past about 2500, the tack drops back and then rises again. If I am under moderate throttle, I can feel the loss of power. Under WOT, I doubt that it would be in 2nd gear yet.

This never happens in automatic mode. Smooth as silk.

Given this, I have to think it is a fault, or a software bug in the tip or engine. I can see no reason for it. It is glaring, not subtle.

It is much too severe to have anything to do with normal torque converter locking up.

AUDIMA4.2 · 07-27-2001, 10:33 AM

Stoney: Just returned this morning from my dealer in MA. Left my '01' 4.2 there, to install 3M Autobond clear bra, and asked the head tech. for his opinion, same question as your's.

We took a test run, I drove it, then he did. In "tip mode" it clearly is the "drive by wire", the tranny design, etc. that has this affect. In "auto mode" much differenct. He also mentioned that to toggle the shifter from auto to tip mode while at stop. If I understood him correctly, this has an affect on the shift points. No really mechanical, so my explanation may be confusing. Sorry.

AUDIMA4.2 · 07-27-2001, 10:35 AM

Your right. Chief tech. at my dealer, said same thing. You just need to "mash" down on the accerlator, to hold that 1st gear longer.

In auto mode, transmission seems to respond better.

Stoney · 07-27-2001, 03:31 PM

Stoney · 07-27-2001, 03:32 PM

AUDIMA4.2 · 07-30-2001, 08:38 AM

Samething with mine..
Tech. says normal, as to do with LTC...
All I know, auto mode works well
Tip mode, need to stump on throttle to hold 1st, and get better response from 2nd and up....

07-26-2001, 11:53 AM	#1
Stoney AudiWorld Super User Account #: 230 Join Date: Mar 2000 Posts: 5,270	Hesitation in 2nd gear, Tip mode... I've noticed a reproducible problem: In Tip (manual) mode, at moderate throttle, after it shifts itself into 2nd gear, and as RPMs rise to about 2500... I observe the RPMs drop slightly (as if the car is about to shift into 3rd gear, but of course it doesn't). Power drops off briefly. I can't think of any explanation for this. The car is nearly new. Using 91 octane gas. That hesitation is problematic when trying to merge or pass. __________________ A6 (C5 platform) FAQ Stoney's Picture Library Email: jds@sonolithics.RemoveThisPart.com 2001 A6 4.2L, Sport, Premium, Nemo Blue, Melange Interior

07-26-2001, 01:38 PM	#2
Jim Selders New Member Account #: 2483 Join Date: Mar 2000 Posts: 190	Probably the lock-up torque converter, you'll see revs drop a little as it locks, and if the revs are low then performance upon acceleration suffers a small amount too, until the transmission unlocks and downshifts. Jim __________________ Jim Hang Up and Drive.

07-26-2001, 10:31 PM	#3
Bollinger Elder Member Account #: 502 Join Date: Mar 2000 Posts: 39,985	TC won't lock in 2nd At least it isn't supposed to. I'd verify that it is before complaining. My guess is that the TC is just "catching up" and getting down towards 1:1, although not locking. It is probably normal and you just need to hit the pedal harder. Then again, maybe not. I think the real problem is that the gearing on the 4.2 is ridiculously low. In my 2.7T I never hit 2nd when passing (it's rare I hit 3rd!) and if I does my neck snaps back viciously. __________________ -- "Nonconformity? Oh yeah, you're the first 20 something kid I have seen with a Japanese letter tattooed on his arm. You want to be a nonconformist? Buy a pocket protector and get a haircut. The Chinese kids spending 20 hours at a time in the library are the ones who really don't care what you think about them" - Dr. House (fictional character)

07-26-2001, 10:48 PM	#4
Stoney AudiWorld Super User Account #: 230 Join Date: Mar 2000 Posts: 5,270	This ONLY happens in Tip mode... I've tested dozens of times. It always happens in tip mode... as the rpms rise in 2nd past about 2500, the tack drops back and then rises again. If I am under moderate throttle, I can feel the loss of power. Under WOT, I doubt that it would be in 2nd gear yet. This never happens in automatic mode. Smooth as silk. Given this, I have to think it is a fault, or a software bug in the tip or engine. I can see no reason for it. It is glaring, not subtle. It is much too severe to have anything to do with normal torque converter locking up. __________________ A6 (C5 platform) FAQ Stoney's Picture Library Email: jds@sonolithics.RemoveThisPart.com 2001 A6 4.2L, Sport, Premium, Nemo Blue, Melange Interior

07-27-2001, 10:33 AM	#5
AUDIMA4.2 New Member Account #: 20279 Join Date: May 2001 Posts: 287	Re: Hesitation in 2nd gear, Tip mode... Stoney: Just returned this morning from my dealer in MA. Left my '01' 4.2 there, to install 3M Autobond clear bra, and asked the head tech. for his opinion, same question as your's. We took a test run, I drove it, then he did. In "tip mode" it clearly is the "drive by wire", the tranny design, etc. that has this affect. In "auto mode" much differenct. He also mentioned that to toggle the shifter from auto to tip mode while at stop. If I understood him correctly, this has an affect on the shift points. No really mechanical, so my explanation may be confusing. Sorry.

07-27-2001, 10:35 AM	#6
AUDIMA4.2 New Member Account #: 20279 Join Date: May 2001 Posts: 287	Re: TC won't lock in 2nd Your right. Chief tech. at my dealer, said same thing. You just need to "mash" down on the accerlator, to hold that 1st gear longer. In auto mode, transmission seems to respond better.

07-27-2001, 03:31 PM	#7
Stoney AudiWorld Super User Account #: 230 Join Date: Mar 2000 Posts: 5,270	Hesitation is IN 2nd gear. I don't care about shift from 1st to 2nd. __________________ A6 (C5 platform) FAQ Stoney's Picture Library Email: jds@sonolithics.RemoveThisPart.com 2001 A6 4.2L, Sport, Premium, Nemo Blue, Melange Interior

07-27-2001, 03:32 PM	#8
Stoney AudiWorld Super User Account #: 230 Join Date: Mar 2000 Posts: 5,270	I'll discuss this with techs on my first service visit. __________________ A6 (C5 platform) FAQ Stoney's Picture Library Email: jds@sonolithics.RemoveThisPart.com 2001 A6 4.2L, Sport, Premium, Nemo Blue, Melange Interior

07-30-2001, 08:38 AM	#9
AUDIMA4.2 New Member Account #: 20279 Join Date: May 2001 Posts: 287	Re: Hesitation is IN 2nd gear. I don't care about shift from 1st to 2nd. Samething with mine.. Tech. says normal, as to do with LTC... All I know, auto mode works well Tip mode, need to stump on throttle to hold 1st, and get better response from 2nd and up....

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