soulsurvivor

I have a 2002 A4 3.0L quattro with the 6 speed manual. If I'm cruising in 4th or 5th gear (sometimes 3rd) at low rpms (around 2000), it sometimes does a quick shudder, like it's misfiring, but then continues to run and idle fine. It never happens in 1st or 2nd... and it seems to me (although I could be wrong) that it's worse when I'm driving in snowy conditions. (I live in Michigan). It runs drives and idles perfect otherwise. It is well maintained and I've just recently replaced all of the spark plugs and ignition coils because it was misfiring on me bad a few weeks ago. I use premium fuel, mobile one oil, all the fluids and filters are new... I'm at a loss. I check the engine codes frequently and all I get anymore is "pin hole leak in Evap system" and "O2 sensor bank 1 yada yada"... Could it be a cam position sensor? My plan is to just keep driving it until it either breaks more, or until it triggers a default code that actually helps me... So frustrating. I have had a lot of small issues with this car, but I just can't justify getting rid of it because it looks and drives so nice, and I can do most repairs myself to save money.

lyleswk

I always seem to be the one that says don't worry about it, but don't worry about it. It sounds like normal drivetrain shudder at low rpm in the higher gears. You don't get it in the lower gears becuase of the gearing and maybe cold weather effect on engine / tranny mounts, etc. Don't go on a witch hunt until something is very obviously wrong.

My 2 cents.

Toiffel

I had the exact same problem, and it was driving me crazy, around 1500 to 2000 rpm upon acceleration there was a shudder, past that point it drove fine, idled fine, it ended up being time to replace my spark plugs, and voila, problem solved...... just might be something as simple as that.....

A4ward

The original post is from 2009...I HOPE he found the solution by now.

For what its worth, everything everyone described sounds like ignition coils to me. Check to see if there was a recall on your model year. Dealer should replace for free.

lyleswk

Since the Audi is not my primary car, don't drive it much during the week. I had some time to drive it this weekend and as opposed to what I said below, it does not shudder all the way down to 1200 or so RPM in the higher gears. No power at all, but it didn't shudder.

Sahail100

I know this is an old thread, but I have exactly the same issue on the same car. A4 2002 2.0 avant.
Been told by some machanics tranny is faulty. Checked the right axle. Gators look okay and could not feel any play. Will check the left on the weekend. I can hear a hissing sound once engine is warmed up at the back of the block, So suspect a vacume leak somewhere as well. Hopping it's not the trans

steveracer

Guys, did you consider replacing the spark plugs?

FWIW, I had the same on my CVT two liter, and this (and coil replacement on that cylinder with one of those "left over" in my trunk) did the trick.

Sahail100

Spark plugs were recently change. Don't think it's coils, as don't have any backfire or engine lights coming up. Going to Change coils anyway under the recall. See what happens. Should axle have some play? In and outwards.

Sahail100

Coils appear to be okay. Getting code 17887 on scan and suspect vacume leak. I can hear hissing once car is warmed up. If I squeeze pipe coming of TB hissing stops. But can't find leak. Could vacume leak cause the jerk at low rpm? Are there more vacume pipes below the intake?

allenst

-run vcds save then clear codes.
-software see if tsb
- throttle body alignment needed
-throttle cleaning.
-vacuum leak.
-low atf
-plugs
-plugs and coils
-fuel filter

-other fuel issues



-----tranny issues.......