Yes egr is usually the #1 area for nox, but ignition timing is in there
also. Anything that raises combustion chamber temperature.
"Andy Crabtree" > wrote in message
ups.com...
> 84 Econoline 150 with 130K miles bought new by a friend of mine.
>
> Under Visual Inspection PCV and Thermostatic Air Cleaner are listed as
> Disconnected, Fuel Cap Functional is listed as Fail, as is Ignition
> Timing.
>
> For measured results Everything is (mostly) ok except for the NO, which
> is 2x the max.
>
>>From the notes it looked like the tech wrote "Engine Idle Speed High".
>
> I was able to look very briefly at the vehicle at night yesterday, and
> noted the pan that clamps down the air filter was missing, as was the
> (?)fresh air hose and the pre-heater hose. Likewise the PCV hose.
> They all appear to have eroded. For the failed NO I am thinking it is
> more likely the EGR than anything? That would seem likely to correlate
> to the Idle being off? I've never worked on a ford van before.
>
> Thanks,
> Andrew
>
> @15MPH RPM = 1409, %CO2=11.7, %02=4.4, HC Max=129 Meas=67, CO Max=0.84
> Meas=0.01, NO Max=1076 GP=2038 Meas=2553
>
> @25MPH RPM = 1159, %CO2=11.4, %O2=4.7, HC Max=101 Meas=69, CO Max=1.06
> Meas=0.01, NO Max=1103 GP=2075 Meas=2209
>
>



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