Fail Emission Test

Can anyone help? I did a tune-up: change spark plugs/wires. Change the
Oil/filter. Air Filter. Just about everything I could think of. Any
suggestions!!!!!Help!!! Failed the Following;
HC-PPM
NOx ppm
The car isn't smoking. You can smell it.

 

Ronnie,

Year? Engine? Mileage? Is the Service Engine Soon light illuminated?

Providing some details would help you get a better answer. Without them,
I'd say to look first at the EGR valve given the high NOx and the fact that
you have changed the other items you listed. Depending on mileage, you
probably should also change the PCV since this is an emissions affecting
item and is simple to replace.

Good luck!

Bob

 

Thanks Bob!
I've changed the PCV Value. but, still I can't seem to pass. Do, you think
the spark plugs are misfiring? About the EGR, I replace that last year!

 

Bob! I have a 93SL1 3.1 Liter Engine. Service Light is not illuminated! I
appreicate your suggestions

 

I doubt you'll find anyone here who can help you with that engine. I'd
venture to say most of us S-series owners, if not all, have the 1.9L.

 

By far I made a mistake with the engine size. You are right it is a 1.9L.

 

I seem to recall that the EGR on that year was vacuum controlled. Check the
vacuum hoses and make sure they are not cracked/brittle/leaking. You should
also make sure the EGR diaphragm holds vacuum. Also, did you replace the
gasket and get the bolts torqued properly when you replaced the GR? How many
mile since this was done? After checking everything else, you may want to
pull the EGR and take a good look to see if it is still OK. The valve
should move freely and not stick open or closed. Also, the vacuum line
should operate the valve. The gasket seat should be cleaned to make sure
there is a good seal and the gasket should be replaced since it is about a
$2-3 item.

If you put in the correct plugs and gapped them properly and replaced/routed
the new wires correctly and since I assume there are no other obvious
symptoms then the plugs are likely not your problem.

Good luck.

Bob

 

He surely knew that and was yanking your chain! Ratbert, you forgot
the smiley!

Wow! What state requires a twelve-year-old auto to pass an emissions
test, California?

 

Georgia! What a headache!!!!!

 

California requires them for 5-year old cars!