Cold start misfire?

[swansailor]

I get a cold start misfire pretty much 100% of the time. Engine starts and stutters and misfires for 20 - 30 seconds. I have tried different gasolines without any noticeable effect. I have had the dealer look at it ...after keeping it overnight and confirming the behavior, they told me it is "normal for a high performance engine". Audi Advocate gave me the same explanation.

I first noticed it after the engine SW updated which was done early this year.

Anyone else have this problem? Ideas on cause/cure?

Thanks.

[Mpalso456]

I get a cold start misfire pretty much 100% of the time. Engine starts and stutters and misfires for 20 - 30 seconds. I have tried different gasolines without any noticeable effect. I have had the dealer look at it ...after keeping it overnight and confirming the behavior, they told me it is "normal for a high performance engine". Audi Advocate gave me the same explanation.

I first noticed it after the engine SW updated which was done early this year.

Anyone else have this problem? Ideas on cause/cure?

Thanks.

I had this exact same issue. I told Audi over and over about this. I took it in and the local Audi rep happened to be at the dealership and they replaced the fuel injectors. It worked just fine for about a month and then right back doing the same thing.

Now it did not start until I say I had about 6k miles on it. But has been with me ever since. It got to the point, were I felt like the car might not start. But since they put the 'new' fuel injectors' in, it has been less severe, but definitely still there.

Let me know if I can help with documentation...

[desperado]

I also get morning roughness on the first start, but not so severe that I am concerned. I notice much less roughness when I use 100LL.

There is a fuel additive that Audi approves and suggests for fuel related problems. See TSB 00 09 01 for more details.

I know you've seen these, but am including them for completeness.
www.r8talk.com/forums/showthread.php?t=2386
Problems w/ R8

[R84ME]

There is a fuel additive that Audi approves and suggests for fuel related problems. See TSB 00 09 01 for more details.

Probably Techron in an Audi bottle...

[harrison]

When R84ME has to start his R8 some winter morning in Arizona he might need a bottle of that stuff !! Or he could let the sun shine on the car for a while to warm it up !!!

[ianerrid]

I get a cold start misfire pretty much 100% of the time. Engine starts and stutters and misfires for 20 - 30 seconds. I have tried different gasolines without any noticeable effect. I have had the dealer look at it ...after keeping it overnight and confirming the behavior, they told me it is "normal for a high performance engine". Audi Advocate gave me the same explanation.

I first noticed it after the engine SW updated which was done early this year.

Anyone else have this problem? Ideas on cause/cure?

Thanks.

Assume this is not just the cold start opening of the valve in the exhaust that is programmed in by Audi? US gas is different to Euro petroleum, possibly causing the injector issues?

[harrison]

My buddies '06 Lambo Gallardo V10 springs to life on start up. NO stumbling. Are there any rough start ups with the R8 V10????????????

[Davey_Dee]

this is the first i've heard of it happening with the R8, not sure if its only V8's tho we'll need V10 owners to comment good to know the Gallardo is fine tho

[KfabR8]

Mine's always done it - burbled, coughed a tad, idled semi-roughly. Probably 3 out of 5 mornings.

Usually by the time I get down my driveway (about 800' of gravel - makes it a bitch to keep the car clean) and turn onto the street it's cleared up.

Sometimes it will still take a quick stab on the throttle pedal and a rev to about 4K to clear it up. I'm always hesitant about doing that to the engine when it's still cold, though.

As I saw posted on another board last summer:
"Turn the key and the monster comes to life. It yawns, burps, farts, scratches it's balls and then says 'Let's go!'"

[Stewart W]

Antime I have a very cold start..(car not driven for a few days) the startup is very rough ..when I periodically drive the car to my office, 10 minute freeway drive followed by 5-6 hours baking in Fl heat, she starts up smoothly..
I spoke with Audi since 1000 miles (now 3K) and they have convinced me this is normal for this V8 & I should not be concerned...