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Emmissions problems (Hi NOX)


helpme

Well-Known Member
Joined
Dec 22, 2009
Messages
235
City
Hotlanta
Vehicle Year
94
Transmission
Manual
Ok, what do I need to do to clean up this engine to pass emmissions? I've got 6 months.
Should I switch over to Techron gas or the Shell stuff?
Is the Seafoam treatment any good?
Put a new cat on two years ago.
Thanks.
 
Has No Egr valve

Some '94 3.0s had no EGR. Its an OBD1 also.
 
If I remember right high NOX is due to running lean. A rich condition would raise the HC but lower the NOX. In a lean condition the CO would be low. It's counter intuitive but if it was running richer it would also raise the HC a small bit but lower the NOX a whole lot.

I'm thinking something's amiss and the truck is running a bit lean for whatever reason. If it doesn't have an EGR then that can't be the problem but if it does then look there first.
 
Thanks

I going to run the Shell stuff from here until Dec. and try the seafoam stuff. I noticed it does run smoother with Shell over the QT gas.
I know I can always put a cat on it and clean it up to pass.
 

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