View Single Post
Old 02-06-2012, 08:55 PM   #7
rfmaster
Registered User
 
rfmaster's Avatar
 
Join Date: Oct 2003
Location: OC CA
Posts: 1,374
Re: 90 350 TBI Vacuum Lines

Quote:
Originally Posted by Stringer View Post
Also, I'm thinking the EGR solenoid must be okay since the new EGR valve got me through a state emissions test. It had failed NOx before the EGR.
How much of the NOx delta did you get before and after EGR swap - you should see it in your test results print out. Usually a partially clogged EGR passage will drop NOx, but not dramatically. If the NOx readings dropped a little bit, just below test threshold you still may have obstructed EGR passages or leaky EGR diaphragm (not applicable since you have new EGR).

A clogged CAT may cause increased exhaust back pressure which will effect EGR test.

//RF
__________________
"The Beast"

1975 Chevrolet C20 longbed
350/700R4! with 3inch body lift
Dual Flowmasters Super 40's!
TBI retrofit completed (2007-07-29)
New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)
rfmaster is offline   Reply With Quote