Epic Fail
- Thread starter harbsup
- Start date
Check for codes. Take care of them first.
What'd you get for your smog numbers?
Replace your vacuum lines, one at a time of course.
A sealing gas cap is a must.
Last time you changed your spark plugs?
Tighten all your hose clamps for intake.
Now for the harder things:
There's that little double nipple thing on the thermostat housing, if one of the nipples is broken and your not using it, your charcoal canister won't do its job.
The above mentions BVSVs are located under your intake manifold, check that they are plugged in and that the vacuum lines are correctly routed.
The egr (California cars only) has a plug for it on the intake side tight in the firewall, if it's not plugged in you won't pass.
-Dave
What'd you get for your smog numbers?
Replace your vacuum lines, one at a time of course.
A sealing gas cap is a must.
Last time you changed your spark plugs?
Tighten all your hose clamps for intake.
Now for the harder things:
There's that little double nipple thing on the thermostat housing, if one of the nipples is broken and your not using it, your charcoal canister won't do its job.
The above mentions BVSVs are located under your intake manifold, check that they are plugged in and that the vacuum lines are correctly routed.
The egr (California cars only) has a plug for it on the intake side tight in the firewall, if it's not plugged in you won't pass.
-Dave
I'm assuming you mean it failed the low pressure evap test. If so no codes will be involved and nothing after (or including) the cannister can be involved. Neither can the gas cap since it's not used during the test.
You're looking at a leak in the evap line from the tank, the tank itself, it's penetrations (fuel pump/sender), the filler neck or it's seal. That said the gas cap *is* tested separately and you may have failed on that. No way to tell unless you can be more specific...
You're looking at a leak in the evap line from the tank, the tank itself, it's penetrations (fuel pump/sender), the filler neck or it's seal. That said the gas cap *is* tested separately and you may have failed on that. No way to tell unless you can be more specific...
Thank you for all of your imput im going to get some of these knocked out. as for the the fail it said F.V.C.F and i dont know how to read the chart but there is a column that reads NO (PPM) and on the 15 mph test it read for 762 max ave 237 and MEAS 1148 and those are what made it fail. Dont know if that narrows it down.
It narrows it down a lot...and not at all. NOx failures aren't associated with evaporative emission controls. You must have two different problems...
Nitrogen Oxides (NOx) failure. Most commonly a problem with your EGR system.
Very confusing post. I suggest you scan the datasheet so we can see for ourselves what is going on.
Very confusing post. I suggest you scan the datasheet so we can see for ourselves what is going on.
Just FYI, I failed emissions this year for NOx, and it turned out to be the cat of all things!
I went over the vacuum control of the egr and the egr itself many times, only to pass with flying colors once I replaced the relatively new cat.
I went over the vacuum control of the egr and the egr itself many times, only to pass with flying colors once I replaced the relatively new cat.
Fwiw it may or may not have been the cat. Due to it's efficiency a new catalyst can mask problems with the feed gas. It's why proper emissions troubleshooting is always done upstream of it...