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3.1 LHO failing emissions on NOx


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Posted

I NEED this thing to pass, its sale is depending on it. :mad:

 

New plugs, wires, o2 sensor, coolant temp sensor, catylitic convertor, fuel filter, 180 stat.

 

Swapped EGR for another one.

 

Any ideas :question:

Posted

NOx is formed at combustion temps over 2500*....My first guess would be the EGR. Maybe u still just need a brand new one. Or try letting the thing sit there and cool down then go thru the line?

Posted

Well it could be that maybe the EGR ports in the manifold are somewhat blocked.

Posted

quite possibly, its at the shop right now for getting certified tomorrow....Im having them look at it.....

 

But keep your ideas coming.

Posted

Yeah, high combustion temps or running and running lean.

 

How are the injectors?

Posted

original to the best of my knowledge... Thanks for the suggestions guys!

Posted

 

 

New plugs, wires, o2 sensor, coolant temp sensor, catylitic convertor, fuel filter, 180 stat.

 

 

New AC delco O2

 

I had it at the shop and they told me my alternator was dying. So I went over to Ryan's (ihateallmustangs) place and swapped it out with an almost new one. It runs much better. Hoping that maybe the computer / sensors / fuel pump / ICM-coils just may not have been getting enough power to work efficiently.

Posted

 

 

New plugs, wires, o2 sensor, coolant temp sensor, catylitic convertor, fuel filter, 180 stat.

 

 

New AC delco O2

 

sorry I don't think I even read it :lol:

Posted

Passed!! Bad alternator believe it or not.

Posted

Wow, the alternator did all that?

 

I'm super glad we don't have emissions here.

Posted

yup delivered it today, the vert is officially gone, ended up taking $3900 for it. Not bad for a 3.1 vert needing paint!

Posted

There was a ton of nicks and scrapes in it. Kinda dull too.

Posted

Altenators will cause all kinds of wierd problems. Last year I got in the car one morning and the thing would not move. All four brakes were locked, ABS light on, Check Engine Service light on. I thought the ABS was screwed up. I never knew that the ABS and the master cylinder could lock the brakes without the pedal being pressed. After an hour of messing with it I noticed the alternator light came on. I checked it and its pumping out about 16 volts to 17 volts. The regulator had gone bad and the extra voltage was screwing the computer up. The guy at the altenator shop said that he'd seen them mess up the whole system before.

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