01 s4 boost issue

01greenS4 · 12-24-2011, 04:03 PM

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.

Prospeeder · 12-24-2011, 07:02 PM

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.

jamesm0913 · 02-01-2012, 04:49 PM

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.

Prospeeder · 02-08-2012, 05:45 PM

a boost pipe blew off. the noise your hearing is all the air escaping not being pulled in

01greenS4 · 02-20-2012, 08:34 AM

Quote:

Originally Posted by jamesm0913

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.

how is it that i could have a toasted break switch if my lights DO work when pedal is pressed?

01greenS4 · 02-20-2012, 08:35 AM

whos is it that my break light could be toasted? if my lights do work when pedal is pressed...

Prospeeder · 02-20-2012, 05:25 PM

Quote:

Originally Posted by 01greenS4

whos is it that my break light could be toasted? if my lights do work when pedal is pressed...

yes that can happen, the swich is actually 2 parts. One part is the lights, and one part is for the abs system. See it either way on a daily basis.

02-01-2012, 04:49 PM	#3
jamesm0913 AudiWorld Member Garage is empty, add now Join Date: Aug 2009 Location: Appleton, WI Posts: 106	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. __________________ 2003 A6 2.7T Tip - NONONO(JFonz Stage 1)NONONO Some random guy on Audizine Stage 1 and 701N DVs

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12-24-2011, 07:02 PM	#2
Prospeeder AudiWorld Senior Member Garage is empty, add now Join Date: Aug 2011 Posts: 837	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.

02-08-2012, 05:45 PM	#4
Prospeeder AudiWorld Senior Member Garage is empty, add now Join Date: Aug 2011 Posts: 837	a boost pipe blew off. the noise your hearing is all the air escaping not being pulled in

02-20-2012, 08:35 AM	#6
01greenS4 AudiWorld Newcomer Garage is empty, add now Join Date: Dec 2011 Posts: 5	whos is it that my break light could be toasted? if my lights do work when pedal is pressed...