I installed a FMIC with 3" piping and checked everything, no leaks DV is sealed and evertything is done right but car wont start! does upgrading the intercooler afect the ECU ? or could it be something else like the cam shaft sensor( i replaced it as i was doing the FMIC) PLEASE HELP!!

 

Any codes?

Check the cam sensor then pull the neg. batt. for a few minutes and try again. Not sure that this will help but worth a try.

 

tried disconnecting the battery but havent checked the cam sensor, almost forgot info.

1999 A4 1.8T Quattro

 

Are there any codes?

 

Havent checked, car is at Moms and i dont hava a scanner. Is it abnormal forcar not to start if you upgrade the piping?

 

I would say something is deff. not put back correctly or installed properly. If the cam sensor is not in right that would cause the problem.

Dont hold me to this but i thought someone had a similar problem because they didn't plug something in by the air box.

 

Checked everything around the airbox, and all other connections. car turns fine but just wont fire up, is the 3" piping OK though? ill check the camsensor again when i get home but if that isnt the case i would like to know if the size in the piping has some type of effect, come on OnePointEightTee, i know you know this one!!!! HELP!!

 

3" piping won't cause a no start condition.
Most common reason for no start after an intercoler install is that you have a connection that has come loose. Usually one of the intercooler pipes...this results in little to no air getting to the throttle body.

You didn't mention the year of you car, so if you have a 99 model or earlier, check to make sure you didn't pull anythingloose on the ICM.

 

If you have a 2000+ there is a sensor that goes in the stock intercooler and needs transfered to the fmic. If you took that out or if its disconnected it might not start.
97-99.5 have the ICM btw but i doubt thats the problem as its no where near where you were working. The harness for it goes from the top of the airbox-along the firewall-to the ecu.

 

That's the boost pressure sensor and it's stock location isright behind the drive side headlight.

The ICM is right on top of the air box. He had to pull the airbox to make up thecharge pipe connections. If he didn't, he must be very flexible.