Well I've been all over the internet looking for help on my Audi and they're old enough now that it's hard to find reliable information. I was hoping some of my SVT brethren might be able to help me with an ongoing problem I've been having with my 2000 S4.
I bought it from my buddy who was not too mechanically inclined. He sold it to me real cheap because it would run like crap when it was cold and would never get full boost. He had taken it to an Audi dealership that said they fixed the problem, $2 grand later and the next day it was doing it again. Well when I got it I figured out the boost problems were a couple of bad vacuum lines and a cracked intake boot. No problem, but I can't seem to figure out the cold start issue. Here's a list of what I've done:
Replaced:
O2 sensors (all 4)
EGT Sensor
Coil packs (all 6)
Coolant Temp Sensor
Ignition Control Modules (both)
Spark plugs
MAF sensor
IAT sensor
Fuel Pressure regulator
Fuel Filter
Intercoolers :banana: (just for more power)
All intake piping except factory Y-pipe
The issue seems to get worse the colder the outside temp is, or it may just be getting worse period and it just happened to be getting cold also :shrug:
When I start it cold it will barely run and stumbles all over the place. It smells like it's running really rich, I can smell fuel. If I shut it off and restart it seems to help, but after a few seconds it will begin stumbling bad again.
After a couple minutes of this it will settle into a stable idle but as soon as I press on the gas a little it stumbles really bad. It will continue to miss and sputter as I drive through the gears until I get above 2000 rpms. Once I get above 2k it starts to boost and it runs fine, but once I come back down it will still do it again. Shifting 1st-2nd is the worst.
The symptoms slowly go away as the car gets warmer and once the car is all the way warmed up it runs like a raped ape (might be faster than my Shelby).
I have a scanner and have looked at all the sensors I know to watch and everything is fine. If I really try to push it when it's still cold it will throw a check engine light but it is just "random multiple misfires". So it doesn't tell me shit. I was just wondering if any of you guys in all your car experience have run across this? :beer:
I bought it from my buddy who was not too mechanically inclined. He sold it to me real cheap because it would run like crap when it was cold and would never get full boost. He had taken it to an Audi dealership that said they fixed the problem, $2 grand later and the next day it was doing it again. Well when I got it I figured out the boost problems were a couple of bad vacuum lines and a cracked intake boot. No problem, but I can't seem to figure out the cold start issue. Here's a list of what I've done:
Replaced:
O2 sensors (all 4)
EGT Sensor
Coil packs (all 6)
Coolant Temp Sensor
Ignition Control Modules (both)
Spark plugs
MAF sensor
IAT sensor
Fuel Pressure regulator
Fuel Filter
Intercoolers :banana: (just for more power)
All intake piping except factory Y-pipe
The issue seems to get worse the colder the outside temp is, or it may just be getting worse period and it just happened to be getting cold also :shrug:
When I start it cold it will barely run and stumbles all over the place. It smells like it's running really rich, I can smell fuel. If I shut it off and restart it seems to help, but after a few seconds it will begin stumbling bad again.
After a couple minutes of this it will settle into a stable idle but as soon as I press on the gas a little it stumbles really bad. It will continue to miss and sputter as I drive through the gears until I get above 2000 rpms. Once I get above 2k it starts to boost and it runs fine, but once I come back down it will still do it again. Shifting 1st-2nd is the worst.
The symptoms slowly go away as the car gets warmer and once the car is all the way warmed up it runs like a raped ape (might be faster than my Shelby).
I have a scanner and have looked at all the sensors I know to watch and everything is fine. If I really try to push it when it's still cold it will throw a check engine light but it is just "random multiple misfires". So it doesn't tell me shit. I was just wondering if any of you guys in all your car experience have run across this? :beer:
.
