New here, quick question on possible lean issue

IHateHacks · 02-13-2007, 04:42 PM

"should there be a pre-cat on the downpipe?"

Yep.

But like Mr.nickleye said, if the EGR valve and vacuum modulator is working, your EGR passages are more than likely clogged or restricted by carbon, therefore causing your high oxides of nitrogen readings.

02-13-2007, 04:42 PM	#7
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	"should there be a pre-cat on the downpipe?" Yep. But like Mr.nickleye said, if the EGR valve and vacuum modulator is working, your EGR passages are more than likely clogged or restricted by carbon, therefore causing your high oxides of nitrogen readings. Last edited by IHateHacks; 02-13-2007 at 04:45 PM.