Hi all,
I'm new to this forum, and new to the Audi fold. I've just purchased a beautiful 1996 S6.
I picked it up last night, with a near-empty tank, and immediately filled it with Sunoco 94 octane. I usually prefer Shell Optimax, but I was out in the country with not much selection.
On the long drive home to Toronto, I noticed that, at medium-to-high revs and 80% or more throttle, the engine stumbles and hesitates. It feels like the fuel flow is being cut suddenly, then it comes back in, followed by more of the same until I let up on the throttle. It happens only after the boost has had a couple of seconds to build. It's very worrisome.
What's going on here? I didn't notice this on the test drive, and I thought I'd put the car through its paces pretty good. The problem seems to only happen in higher gears, but I figure that's because only the higher gears allow me to put my foot down for more than a second. The lower gears are FAST. I will try later to make this happen in lower gears, but in any case I don't think what gear I'm in has anything to do with it. I'm just saying that I only notice the problem in 4th or 5th when opening the throttle for more than two seconds.
I definitely don't hear any pinging, but maybe what's happening is the anti-knock sensor cutting the fuel flow before the pinging starts. Could that be it? With 94 octane fuel? And, if so, what to do about it?
The car is a bit hotted-up with an ECU upgrade, but the drivetrain, engine and turbo are OEM, and the car's well cared for with a full service history. The seller, whom I trust, did not mention this when I asked him about known problems with the car. But maybe he just doesn't put his foot down.
What could be going on here? I'm really concerned and want to get this fixed. I'm considering dropping in a bottle of octane boost just to confirm or rule out fuel as the problem.
Any suggestions? Many thanks.
Signed,
New guy who's a bit pissed his car's not working quite right.
I'm new to this forum, and new to the Audi fold. I've just purchased a beautiful 1996 S6.
I picked it up last night, with a near-empty tank, and immediately filled it with Sunoco 94 octane. I usually prefer Shell Optimax, but I was out in the country with not much selection.
On the long drive home to Toronto, I noticed that, at medium-to-high revs and 80% or more throttle, the engine stumbles and hesitates. It feels like the fuel flow is being cut suddenly, then it comes back in, followed by more of the same until I let up on the throttle. It happens only after the boost has had a couple of seconds to build. It's very worrisome.
What's going on here? I didn't notice this on the test drive, and I thought I'd put the car through its paces pretty good. The problem seems to only happen in higher gears, but I figure that's because only the higher gears allow me to put my foot down for more than a second. The lower gears are FAST. I will try later to make this happen in lower gears, but in any case I don't think what gear I'm in has anything to do with it. I'm just saying that I only notice the problem in 4th or 5th when opening the throttle for more than two seconds.
I definitely don't hear any pinging, but maybe what's happening is the anti-knock sensor cutting the fuel flow before the pinging starts. Could that be it? With 94 octane fuel? And, if so, what to do about it?
The car is a bit hotted-up with an ECU upgrade, but the drivetrain, engine and turbo are OEM, and the car's well cared for with a full service history. The seller, whom I trust, did not mention this when I asked him about known problems with the car. But maybe he just doesn't put his foot down.
What could be going on here? I'm really concerned and want to get this fixed. I'm considering dropping in a bottle of octane boost just to confirm or rule out fuel as the problem.
Any suggestions? Many thanks.
Signed,
New guy who's a bit pissed his car's not working quite right.
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