01 s4 boost issue
#1
01 s4 boost issue
hey guys im new here and im trying to figure out why the heck is my car not boosting?
Symthoms? : check engine says maf high input...
its a tiptronic and the car drives nice,it doesnt hesitate nor idles rough,it doesnt miss,but as you go down the road the car feels very slow as in if i was to floor it the car will downshift and has a very hard time reving up,i feel its sucking alot of air but the car wont put my head in the head rest! but when the ESP & ABS light turns on at the same time the car will go a bit faster!ive changed wastegate actuator (boost valve n75) but the car hasnt changed a bit,i highly doubt its the MAF sensor...i have a mac mentor scanner and i clear the code everytime the CEL comes on,but thats the only code and i have no idea why im stuck on limp mode then the ESP and ABS light pops on the car boost a little more? shouldnt it be the other way arround?also when i disconnect the MAF the car feels worst.
Symthoms? : check engine says maf high input...
its a tiptronic and the car drives nice,it doesnt hesitate nor idles rough,it doesnt miss,but as you go down the road the car feels very slow as in if i was to floor it the car will downshift and has a very hard time reving up,i feel its sucking alot of air but the car wont put my head in the head rest! but when the ESP & ABS light turns on at the same time the car will go a bit faster!ive changed wastegate actuator (boost valve n75) but the car hasnt changed a bit,i highly doubt its the MAF sensor...i have a mac mentor scanner and i clear the code everytime the CEL comes on,but thats the only code and i have no idea why im stuck on limp mode then the ESP and ABS light pops on the car boost a little more? shouldnt it be the other way arround?also when i disconnect the MAF the car feels worst.
#2
AudiWorld Super User
Bad MAF, or a big intake leak, or a boost pipe blew off. Air filter isnt clogged, or the snow screen inside of the airbox assembly can get plugged solid and starve the engine of air bigtime.
#3
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Join Date: Aug 2009
Location: Appleton, WI
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When the ESP and ABS lights come on at the same time, that's a dead giveaway that the brake light switch is toast. I've had to replace 2 of them and each time the symptoms are low boost levels and the two dash lights. $20 part and 10 minutes to replace.
#5
how is it that i could have a toasted break switch if my lights DO work when pedal is pressed?
#7
AudiWorld Super User
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