sondogg12 Posted September 19, 2006 Share Posted September 19, 2006 For 03 and early 04 with latest calibrations ive been dealing with more and more po401,insificant egr flow.For me most of the time ill find a IAT gooey,or cooler pluged. What has been the fix for you guys out there?? Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted September 20, 2006 Share Posted September 20, 2006 Dirty MAF sensors. I have made it a general practice to clean the IAT2 and MAF sensors whenever I have a driveability concern or I have things apart. I had two odd ones though. A cracked y-pipe that PASSED the VGT Learn and did not set any other codes but the P0401. The other was an Econoline that had a very dirty air filter. Yeah, I know, it's not a 2003 engine in a Super Duty but it's worth mentioning. Quote Link to comment Share on other sites More sharing options...
sondogg12 Posted September 20, 2006 Author Share Posted September 20, 2006 what do you clean maf and iat with? I did have a couple aftermarket air box cause a po401. I just installed some exhaust manifold gaskets yesterday.It was the only thing i could find wrong with truck. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted September 20, 2006 Share Posted September 20, 2006 CRC makes a good MAF sensor cleaner. I think there is a topic about that in the chemicals topic area. Quote Link to comment Share on other sites More sharing options...
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