Emissions

[NEbandit]

He yall,

I just failed my emissions test today in MA. I have 60 days to resolve this issue with very little money. The state inspections tech told me to change my Cat and it will resolve the issue. Does anyone have any ideas? I have changed plugs, wires, cap, fuel filter, air before the test. If so how much would the cat run me for labor and parts? Thank you in advance.

Thomas

 

[madmax]

First before you do anything try emptying out the tank and putting in premium, It burns more thoroughly so there should be less NO, If that doesn't work then try changing the exhaust system.

Also high NO readings usually indicate the engine is running too rich, try having it tested with no air filter, that should allow it to **** down more air.

If you do need to get new cats

You can pick up a couple honeycomb cats from any speed shop for 20 bucks each, give or take. Also your O2 sensor could be bad, swing by an automotive store that can do the code scan for free and if the sensor is borked they will tell you. The front cat has two pipes running into it, so I'd personally just hack it off there and make a Y to go into one 3" honeycomb cat then right into a second one with the O2 sensor in between. the only part you'd really need to weld up would be the Y and that isn't too hard to make also you'll need to cut out the piece that the O2 sensor threads into and weld it into the pipe between the two cats, then you can just clamp everything else together. The input on the muffler should be 3" (at least it was on mine). Might cost ya 100 bucks for the two cats and the O2 sensor.

 

[NEbandit]

First before you do anything try emptying out the tank and putting in premium, It burns more thoroughly so there should be less NO, If that doesn't work then try changing the exhaust system.
Also high NO readings usually indicate the engine is running too rich, try having it tested with no air filter, that should allow it to **** down more air.

If you do need to get new cats

You can pick up a couple honeycomb cats from any speed shop for 20 bucks each, give or take. Also your O2 sensor could be bad, swing by an automotive store that can do the code scan for free and if the sensor is borked they will tell you. The front cat has two pipes running into it, so I'd personally just hack it off there and make a Y to go into one 3" honeycomb cat then right into a second one with the O2 sensor in between. the only part you'd really need to weld up would be the Y and that isn't too hard to make also you'll need to cut out the piece that the O2 sensor threads into and weld it into the pipe between the two cats, then you can just clamp everything else together. The input on the muffler should be 3" (at least it was on mine). Might cost ya 100 bucks for the two cats and the O2 sensor.

Thanks man! Ill be on that for next weekends project.

 

[miesk5]

Thomas,

yo!

Do you also have a check engine light lit?

If so, read the codes before you buy since;

NOX failures are usually EGR-related, since the EGR system is primarily responsible for reducing oxides of nitrogen. But NOX emissions can also be caused by a bad three-way converter or a computer control system that remains in open loop.

Other causes are bad O2 sensor, bad cat converter, improper spark advance, combustion chamber deposits, Lean fuel mixture & anything else that causes "lean" condition will raise the combust. temp and raise the NOX reading.

&

High NOx is usually due to a stuck, plugged, or disconnected EGR valve. A stuck/inoperative EGR valve commonly causes knocking because the added exhaust flow the valve puts into the cylinder will cool off combustion, and reduce the chance of knocking. The level of knocking must be too high for the knock sensor to reduce.

Typically, a failed EGR valve shows up as surging and/or knocking at part throttle, but the knocking can occur any time. Check all of the vacuum lines that lead to the valve (it might be working fine, but the vacuum to operate it might never get there. A test to see if it works is to idle the car, then suddenly open the throttle to 2000-2500 RPM. You should see the EGR valve stem open up as quickly as the throttle did. If it doesn't move or is sluggish, there's the trouble.

by Ed H at allpar.com

GL!

 

[NEbandit]

Thomas,yo!

Do you also have a check engine light lit?

If so, read the codes before you buy since;

NOX failures are usually EGR-related, since the EGR system is primarily responsible for reducing oxides of nitrogen. But NOX emissions can also be caused by a bad three-way converter or a computer control system that remains in open loop.

Other causes are bad O2 sensor, bad cat converter, improper spark advance, combustion chamber deposits, Lean fuel mixture & anything else that causes "lean" condition will raise the combust. temp and raise the NOX reading.

&

High NOx is usually due to a stuck, plugged, or disconnected EGR valve. A stuck/inoperative EGR valve commonly causes knocking because the added exhaust flow the valve puts into the cylinder will cool off combustion, and reduce the chance of knocking. The level of knocking must be too high for the knock sensor to reduce.

Typically, a failed EGR valve shows up as surging and/or knocking at part throttle, but the knocking can occur any time. Check all of the vacuum lines that lead to the valve (it might be working fine, but the vacuum to operate it might never get there. A test to see if it works is to idle the car, then suddenly open the throttle to 2000-2500 RPM. You should see the EGR valve stem open up as quickly as the throttle did. If it doesn't move or is sluggish, there's the trouble.

by Ed H at allpar.com

Yes check engine is on. I will change the valve and O2 sensor. Thanks Miesk5!

GL!

 

[miesk5]

yo!

Check codes before you buy...Self Test & Connector Location & pics, Bronco & Ford BEST PROCESS WITH DIAGRAMS! Source: by Ryan M (Fireguy50) at fordfuelinjection.com

sorry left Ryan's Link out for the code DIY