Sk8runeg

iTrader: (11)

My car is a 1999 A4 with Lid, Bellow, Longtubes, OR/Y, Spintech Muffler, and a tune fron EastSide Performance.

My car has always gotten terrible gas mileage since I did the mods and got it tuned. It would usually average around 14 and if I did only highway driving I would be able to see maybe 20...

the other night though, my car just randomly started misfiring really bad and it would bog the surge once I gave it a little gas...

I changed the spark plugs a few thousand miles ago, but I changed them again anyways... They looked pretty bad when I pulled them. Since I changed them it has been a lot better but I can still feel it missing a little at idle when its in gear, and it seems like it gets worse when I turn the heater fan up higher...

As it is now, I am getting like 200 miles on a full tank, and I can't even afford to drive this car anymore......

P.S. - I had NGK TR55's in it and when I pulled them they were really brownish/white...

Please help with any suggestions... If I cant figure this out I am gonna need to sell the car....

Thanks
-Scott

deadlyz28

iTrader: (29)

plug wires?

92SilverSHO

iTrader: (3)

lol 200 miles to the tank is good mileage man. i get less than that in the city, like 9-10mpg, granted it was getting cold and short trips but still. Summer time i see around 12-14.

andy670ho

iTrader: (3)

02's might be fouled or just worn out. Mine did this, replaced my 02's and it was fine, also check all your sensors, coolant temp sensor might do that also.

1Loudz28

iTrader: (47)

im having a similar problem! my car bogs bad at slight acceration and imgetting about 180 miles to the tank.

is your car throwing any codes?

BlueBeastSS

iTrader: (2)

Thats what mine is doing i have an 01 SS and i recently changed the spark plugs and wires but still does it when im at 5,000 rpm's in second it makes this loud popping noise it dont sound like a backfire though.

Pro52R

iTrader: (15)

dark color is running rich..white is running lean

SuperSlow02

iTrader: (16)

I had a similar problem...my #2 plug wire was burnt...wasnt very noticable for awhile till it completely broke in 2

Boother

Ya my 01 WS6 is getting horrible mpg and sort of misfires at idle..... new plugs and wires, even hooked it up to a scanner... that told me nothing at all...WTF

King Nothing

iTrader: (9)

i guess i should feel lucky i get 380 to a full tank but that wont be like that for long hahahaha