Join Date: Mar 2004
Location: Chattanooga, TN
Crew Cab Sonoma is offline
Re: EVAP/Cat CODE Failing inspection... help!
first, you need to find out what the exact code is.
next, resist the urge to "clear" the codes.
thats right, dont clear it....
once the problem causing the code is fixed, the light will soon
turn itsef off. the code stored in "memory" will not
cause you to fail an inspection.
only active codes (SES light on) will, or excessive number
of "not ready" monitors.
in my area, and many others, a certain number specific
"not ready" flags are permitted, usually two.
but a cat monitor "not ready" is usually not allowable.
every time you clear the codes all readiness monitors are
reset to "not ready", and have to run again.
the cat monitor should complete after a few cycles
at light highway speeds.
the evap is more picky. on some vehicles, it might not
complete for years...
basically, the evap test tries to run after a cold start,
in park, at idle, air temps between 40-75 deg. F,
and fuel level not under 1/4, and not over 3/4 full.
if fuel level and air temp requirements are met, try letting
the truck idle for a couple of minutes after a cold start
to giv it a chance to run the monitor test.
if its failing the evap test, and thats whats setting your
SES, then there are several things that could be causing
a leak in the system.
anything from a loose or bad gas cap seal, loose hose clamps
on the filler pipe, damages tubing /piping, or a bad O-ring seal
between connections, an improperly tightened "test port" cap
(green colored) by the purge valve, faulty "test" valve, located
near the evap (charcoal) canister. even a damaged or punctured
a faulty purge valve on the intake manifold,
find out whats causing the the code to set and fix
01 Sonoma Crew Cab 4WD 4.3 auto (SOLD)
00 Sonoma Ext. Cab 4WD. 4.3 auto 3.42 Torsen diff. front axle removed. leafspring clamps (anti-hop)"W4M" tune. '06 "989" quiet cam, efans, TB UNmod, 3100 valve springs. 2.13 60ft. 9.52 @ 72.7 mph (1/8 mi.)
95 S-10 2.2. Soon to be DD
Last edited by Crew Cab Sonoma; 12-09-2009 at 09:39 AM.