i have a s4 n/a thats been turbo charged car was running fine when i drove it to work still running fine when i left took a real bumpy road stopped to put gas and stated driving once the rpms hit 3000 it starts to sputter and backfire once i got home clouds of white smoke just keeps pouring out of the exhaust at idle just smells like fuel i was thinking when i took that super bumpy road something might have came loose but i dont know what

 

Holy run-on sentence, Batman! Give me a second to decode.

 

^+1

Anyway... Who did your tuning? Do you have a FPR? How long has it been since your injectors have been serviced?? Need more info.

 

no fpr...idk who did the tuning on the car or when the injectors been serviced , but the ecu is hooked up to a hks fuel computer. man the car was running perfect then blah! what should i check first?

 

Check everything that has anything to do with the fuel system. (Everything from the fuel injectors back to the fuel pump.) Can you post a video or anything??

 

Compression test. Think Apex seal.

 

plus one on compression test. white smoke can also mean coolant burning. say your prayers tonight,

 

Well... I changed the plugs , drained the gas and now its back to normal smoked a bit and stoped so I guess its fixed

 

stale gas gettin mixed in. who knows. luckily its better?

 

turns out the premium gas at the store was mixed with diesel

 

I'd sue them then..for the cost and labour of draining gas etc..
How the Fark can they mix gas and Diesel??..the delivery guy must have been a real friggin rocket scientist.!

 

If this is the case... You should have a decent case on your hands. Unless you carelessly pumped your gas.^

I don't doubt that this has happened... But it seems highly unlikely.

Go back to that gas station immediately, get some of that "premium" gas in a can, and do a little testing. You'd think that station would have been confronted ASAP.

 

i was close then. i didnt think it would be anything serious. not very many people who have these cars drive them around if they arent really that nice... lol and i agree with them. you should go after them. think of what that could have done to your car..