[Shotimes] 93 SHO Failed Texas State Inspection

Sat, 9 Apr 2005 14:34:14 -0400

Pretty good chance is that it's the 02 sensors. They will throw a code when
they fail outright, but they won't usually if they're just getting old.
Replace them and see what happens. The front one isn't that bad to get to;
the back one's a pain.

Also, for shits 'n giggles, check the MAF out to make sure the sensor wires
aren't fouled, especially if you're using a K&N.

Like Chris said, the 155 won't mess up anything; it's the 190,225 etc. fuel
pumps that overload the regulator.

Jason

-----Original Message-----
From: Chris Mayfield [mailto:fsmtnbiker@gmail.com]
Sent: Saturday, April 09, 2005 1:58 PM
To: shotimes@autox.team.net
Subject: [Shotimes] 93 SHO Failed Texas State Inspection

High NOx is typically indicative of a lean mixture. How old are your
oxygen sensors?

The fuel pump will not cause this - the 155 is a perfectly acceptable
stock replacement and will not cause any running or driveability
issues.

Chris

On Apr 9, 2005 10:21 AM, Anthony del Busto <dbusto@earthlink.net> wrote:
> I took my 93 in for the state inpection and couldn't believe that it
failed.
> It failed the Nox(ppm) on both the high (25mph) and low (15mph) speed
> emission results.  Am I correct to assume that the engine is not burning
the
> fueling efficiently?  Back in October I replaced the original fuel pump
with
> a new 155 ltr/hr fuel pump.  Could this be the culprit?  Should I intall
> check the fuel pressure and install a fuel regulator if pressure too high?
> New wires and plugs (all Ford OEM) recently installed as well.  Please
> advise.
>
> Tony
> 93 mtx (stock)
> 110k
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> Shotimes@autox.team.net
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