check the O2 sensor
______
Bill Treadway
Broker Associate
John Daugherty Realtors
281-639-4444  Direct
281-850-8141 Cell
832-550-2615 Fax

On Aug 12, 2006, at 6:41 PM, Automatic digest processor wrote:

> Subject: failed TX emission test
>
> Hi all,
>
> Just got my van inspected and it failed the emission portion of the
> test
> and the gas cap test. The only portion of the emission test it failed
> was the high speed CO portion. The state standard is 1.20% my van
> tested
> at 3.31%
>
> The van has a new cat, muffler, new plugs and wires, new rotor, air
> filter, fuel filter. The van is in good tune.  The van is an '85
> with a
> newly rebuilt 2.1 wbx (with < 10000 miles on it) and Digijet FI
> (with a
> Vanagain high performance ECU). Since I installed the new exhaust, the
> van backfires when I come off the gas and the engine has no load. If I
> give it any gas at all, whether it is in gear or not, the gackfiring
> goes away. The backfiring is not loud. It is more like a string of
> softer crackling backfires, it sounds like the way green wood crackles
> when it burns or a small string of muted firecrackers. I don't know if
> the backfiring is related to the failed emission test or not.
>
> Any ideas for what to check would be appreciated.
>
> Thanks.
> Sam