I assume you have checked all tune-up items.
Check to see if the idle/full throttle switch is working.
If so,  check the fuel injectors I've found them to
cause this problem, if over about 150,000 miles.
                                             Eric

Melvin Mudgett-Price wrote:

>Took my van for its Ohio e-Check yesterday. The engine has 20,000 on a
>rebuilt Boston Bob. It passed with flying colors 2 years ago. This time
>it failed on Nitrous Oxide emissions, they are supposed to be around
>900, mine were 1,900.
>
>I called my regular mechanic (VW specialist) and he said there was
>nothing he could do, when van's start failing their emissions test
>that's usually the end for them. This sounds like total bs to me and I
>don't know why he doesn't seem to want to even look at the van. Called
>another VW shop and they said no problem, bring it in.
>
>Now to my question. What sort of things would cause the "NO" to be high.
>I would like have some idea not because the mechanic will try bamboozle
>me but because I don't like to be in the position where he could.
>
>Thanks
>Melvin
>83.5 Westy
>
>
>
>