302stephen
03-13-2021, 12:45 AM
Hi everyone,
I was hoping to get some input on an issue I've been having with my 2014 S4. A little while back my water pump started leaking so I decided to do that and all the related maintenance. I replaced the water pump, thermostat, PCV, and did a carbon cleaning. I also replaced various gaskets and O-rings that I removed including the fuel injector O-rings. I soaked the injectors that came out with the intake runners/fuel rail in injector cleaner as they where looking dirty but didn't have the proper tool to remove the others from the heads so I let them be.
After putting everything back together and driving about 800 miles or so I started to smell a strong fuel smell while driving. I looked around under the hood and determined the fuel leak was coming from under the supercharger. I took the supercharger back off and pulled off the intake runners and saw that I forgot to remove some of the old fuel injector O-rings and one of the new ones had been damaged. I didn't have any spare O-rings on hand so I had to reuse one of the old ones that looked to be in good condition.
After putting everything back together again I drove around a little and got a CEL, after looking at the codes I realized that I didn't push the flaps in the intake runners down as I was installing them so they where stuck closed. I pulled everything apart again and lifted the intake runners just enough to push the flaps down and get everything set again. I put everything back together again and the next day started smelling fuel again.
I ordered more of the fuel injector O-rings and tore everything apart again and found another damaged injector O-ring. I replaced it and put everything back together again today but after leaving my car sitting for a couple hours it took a couple extra seconds longer than it normally does turning over to start. It seems to still be lousing fuel pressure although it doesn't smell strongly of fuel yet. The first couple times it was leaking the leak would get worse and worse until the car would barley stay started at idle.
Some other info that may or may not be relevant:
I followed the instructions in FCP Euro's videos for doing everything.
I used URO fuel injector O-rings instead of OEM.
The car is a 2014 S4 DSG Prestige with about 72K miles.
The car is ECU and TCU tuned with IE stage 1, has an IE intake and ECS tuning exhaust.
Does anyone have any ideas on what I can do? I'm getting way better at taking the supercharger off than I ever wanted to be and at this point I just need it to run. I would really appreciate another perspective on this; the only other things I can think to do is replace the injector O-rings again with OEM O-rings, replace the injectors all together, or take it to a shop and hope they can fix it. Those options can get pretty expensive so I was hoping to get some outside perspective first. I know the chances are high that I'm just not doing something right when taking everything apart/putting it back together but I am at a loss as for what to do differently.
TLDR: Persistent fuel leak from around injectors after carbon cleaning even after replacing the Injector O-rings.
I was hoping to get some input on an issue I've been having with my 2014 S4. A little while back my water pump started leaking so I decided to do that and all the related maintenance. I replaced the water pump, thermostat, PCV, and did a carbon cleaning. I also replaced various gaskets and O-rings that I removed including the fuel injector O-rings. I soaked the injectors that came out with the intake runners/fuel rail in injector cleaner as they where looking dirty but didn't have the proper tool to remove the others from the heads so I let them be.
After putting everything back together and driving about 800 miles or so I started to smell a strong fuel smell while driving. I looked around under the hood and determined the fuel leak was coming from under the supercharger. I took the supercharger back off and pulled off the intake runners and saw that I forgot to remove some of the old fuel injector O-rings and one of the new ones had been damaged. I didn't have any spare O-rings on hand so I had to reuse one of the old ones that looked to be in good condition.
After putting everything back together again I drove around a little and got a CEL, after looking at the codes I realized that I didn't push the flaps in the intake runners down as I was installing them so they where stuck closed. I pulled everything apart again and lifted the intake runners just enough to push the flaps down and get everything set again. I put everything back together again and the next day started smelling fuel again.
I ordered more of the fuel injector O-rings and tore everything apart again and found another damaged injector O-ring. I replaced it and put everything back together again today but after leaving my car sitting for a couple hours it took a couple extra seconds longer than it normally does turning over to start. It seems to still be lousing fuel pressure although it doesn't smell strongly of fuel yet. The first couple times it was leaking the leak would get worse and worse until the car would barley stay started at idle.
Some other info that may or may not be relevant:
I followed the instructions in FCP Euro's videos for doing everything.
I used URO fuel injector O-rings instead of OEM.
The car is a 2014 S4 DSG Prestige with about 72K miles.
The car is ECU and TCU tuned with IE stage 1, has an IE intake and ECS tuning exhaust.
Does anyone have any ideas on what I can do? I'm getting way better at taking the supercharger off than I ever wanted to be and at this point I just need it to run. I would really appreciate another perspective on this; the only other things I can think to do is replace the injector O-rings again with OEM O-rings, replace the injectors all together, or take it to a shop and hope they can fix it. Those options can get pretty expensive so I was hoping to get some outside perspective first. I know the chances are high that I'm just not doing something right when taking everything apart/putting it back together but I am at a loss as for what to do differently.
TLDR: Persistent fuel leak from around injectors after carbon cleaning even after replacing the Injector O-rings.