So I have been running a SMC kit for a couple months now using 100% meth. AMS tuned me at WOT through 3rd and 4th I was stable between 10.8 and 11.1 now all of a sudden I am at 12.3. I drove Autobahn on monday and everything was cool then yesterday it started acting up. I haven't changed anything. Any help would be great.

 

I would say most likely cause would be crud in nozzle - decrease of flow.

I filter the alcohol as I pour it into the reservoir because I use the Heet product - which causes pieces of foil to contaminate fluid as you pour

I am no expert, just have a little exp here and there

 

I tried cleaning it and still the same problem

 

are you sure the pump is spraying? or spraying at the proper psi? it def sounds like you are not getting enough/any meth injected. test out the kit. you said you cleaned the nozel, but did you actually check for spray? a lack of spray will make you run really lean which is what looks to be happening.

 

now i dont have a kit on my car but i just got done installing one on another car and mad a lot of passes tuning it without any issues. Then all of a sudden it would start leaning out after it was tuned. So just for sh*ts and grins we took the cap off the bottle and drilled a bigger breather hole. The stock breather hole was being covered by the rubber gasket under the lid...and once that was done all was fine. it worked like it should. It may have not been the issue it may have been that the bottle was getting low and air got into the lines and so we also checked at the nozzle by taking it off the car and turning the pump on to make sure it was flowing right and it was.. but after all that with the hole drilled we never had anymore issues.