failed emissions help
psyopnone
10-24-2003, 04:16 PM
I failed the emissions test on a 91 GMC Vandura, 5.7L:
readings as follows;
high speed/low speed
HC 438/423
CO 4.32/4.29
also I do not have any stored trouble codes.
Any ideas as to what the cause is?
readings as follows;
high speed/low speed
HC 438/423
CO 4.32/4.29
also I do not have any stored trouble codes.
Any ideas as to what the cause is?
Automotive Network, Inc., Copyright ©2026