Mr. Kilmer, I am a huge fan and really enjoy your videos and have gotten some great information from them.
I've got a 2007 Audi A4 Quattro, 6 speed manual trans, and 3.2 v6. Current milage is ~220,000. For the last 2 years I've been dealing with a stalling issue on warm starts. It doesn't always do it and it's very random when it does..... when it does happen it will start up normally and run fine for about 4 seconds and then die. It usually starts right back up and then I'm on my way. Occasionally it will do it 3 or 4 times in a row before I can drive away and it takes a good brief rev to 6000 rpm to keep from stalling out....I've only got to rev it if it stalls more than once. It has also stalled a couple times when I get stuck in a traffic jam and it has to idle for more than 10 min. Aside from that issue it runs great. Has an extremely smooth idle, tons of power, I checked compression recently and all cylinders were between 180 and 187 psi. Fuel rail pressure runs about 500 psi at idle and 1700psi when I punch it. It doesn't have a check engine light lit however I am able to get 2 codes when I scan it. U3f00 and u3fff. There is no information anywhere online about those codes and the dealer wouldn't tell me what those codes meant over the phone. (They want me to bring it to them and theres not a snowballs chance in hell they are going to look at it) I've been dealing with this issue for 2 years and it's not getting any worse or any better for that matter. What could this be! It stalled on my wife once and now she doesn't dare drive the thing but it happens at least once a week with me. I'm hoping to get this car to 300,000 mi before I get rid of it. All in all it's been a great extremely reliable car and in 10 yrs of ownership I've put less than $2000 in repairs into it....I do all the work myself. The biggest repair was the clutch at 180,000 mi. I'm really hoping I can get this one resolved otherwise I'm just going to keep living with it. Any information that might lead me in the right direction would be greatly appreciated. I apologize for the novel, just trying to be very thorough in describing what's going on. Thanks
You probably have bad fuel injectors. Clean them with pressurized cleaning procedure in a mechanic shop, if it did not help, change the fuel injectors and while you are there, change the spark plugs too.
Thanks. Spark plugs are new....less than 10k mi. And the problem was present before and after the new plugs. I actually bought a new set of all 6 injectors before I read your reply. I haven't been online in a few days and I haven't gotten around to installing them yet but I believe you are dead on the money. Recently, the last 2 weeks or so I've been noticing it has a long crank in the morning. When I check my fuel rail pressure with a scan tool it appears all my pressure has bled off over night and it takes 3 or 4 seconds of cranking before the high pressure fuel pump builds enough pressure (around 350 psi) to start. I put a new filter, regulator, and inline check valve and still have pressure bleeding off overnight. When I pulled the spark plugs the other morning, cylinders 4 and 6 definitely had a raw fuel smell on the plugs leading me to believe the injectors are leaky and maybe contributing to my other hot start & stall issue. Hopefully I get sometime this weekend to pull the manifold and replace them. I also bought a new fuel rail pressure sensor that I'll be replacing while I've got thinks taken apart and have access to it. I'll let you know if it works. Thank you so much for your reply and stay safe out there in this crazy world