Emissions question

[Ganday B]

Hi Guys/Gals,

I live in MASS and just had my 95 MTX inspected. Well they put it on the machine and drove it through 6 different cycles and it failed 2 of them on NOX. It was 4 times over the regulations. The other 4 cycles were fine. I don't have any stored codes. I actually cleared them a week ago. I had a 176+177. They O2 sensors are less than a year old. The mechanic told me to replace the EGR valve but the MTX's do not have one.
The car has 106K miles and I have done the 60K at 75K. I haven't changed the plug wires and the CCRM isn't turning the cooling fan on. I changed the ECT sensor last week. The car has I belive an exhaust manifold leak, I haven't taken off the heat shield yet to inspect.
Any thoughts?

Thanks,
Gary

 

[Slo-Sho]

You could try unplugging the SPOUT connector. This will put the ignition timing at 10 degrees BTDC. The car will be low on power but have a better chance of passing.

 

[jedhead]

I passed the NOX with room to spare by removing the SPOUT connector. Just got a stage 1 cammed SHO to pass with the SPOUT removed too.

Bob

 

[Rob94]

Change the O2 sensors. Whenever a car fails for NOx, new O2 sensors bring it right in. I just failed for NOx also. Limit is 2.50 tested at 2.76

 

[Ganday B]

Well I feel dumb. I have no idea what a SPOUT connector is. I was thinking about anothe O2 sensor also.

Thanks

 

[SHOpoor]

How did you clear the codes? If you just erased them, then you didn't fix the problem. The O2 sensor is probably the correct fix, but the spout connector is easy to try. Look by the connection for your code reader and you will find a connector with a thing that looks like a flat plug in the end of it. That is the spout connector. Just pull it out.

 

[shoguy311]

I failed NOX down here by .01, the limit is 2.00. I changed just the rear O2 as my codes were indicating, made sure i got those cats hot when i brought it back and passed with a 1.47

 

[Ganday B]

Thanks Guys,

I have another month to try and get it right.

Gary