[Shotimes] Re: 93 SHO Failed Texas State Inspection

[Ron Porter]

But, all 49-state MTXs never had EGR valves, and passed emissions just fine.
 
Ron Porter

Alan Fanning <Awfanning@earthlink.net> wrote:
For cars that have it, the EGR system is a common source of problems in
failing NOx limits due to plugging of the passageways in the intake
manifold. In general, high NOx is caused by high combustion temperatures
(which are moderated by a properly functioning EFR system).

Alan


wrote:

> Subject: RE: [Shotimes] 93 SHO Failed Texas State Inspection
> Date: 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
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