Performance Parts
Performance Parts
Performance Auto Parts HomePerformance Auto Parts  StoreContact A-1Parts Performance Auto Parts    
type this page key phrase here, catalytic converters, discount catalytic converter, direct fit catalytic converters, universal catalytic converters, o2 sensors
 Auto Parts Menu
 :: performance parts home
 :: auto parts store
 :: about A1-parts.com
 :: performance exhaust
 :: shock absorbers
 :: mufflers & exhaust
 :: diesel exhaust systems
 :: catalytic converters
 :: auto parts search
 :: auto parts news
 :: parts sitemap
 :: contact us



type this page key phrase here, catalytic converters, discount catalytic converter, direct fit catalytic converters, universal catalytic converters, o2 sensors

Contact A-1Parts Performance Auto Parts
 A-1Parts
 1419 Upland Ave.
 Houston, TX 77043

 Toll Free USA
 888-996-0303

 Outside USA
 713-722-9200

 Fax: 713-722-9219

 Email

 


What causes High NOX Emissions


Thousands of technicians have faced the challenge of bringing a particularly stubborn application into compliance for NOx emissions. High NOx readings are a clear sign of performance issues somewhere in the system. The question is, where?

Among the potential causes of non-compliant NOx readings are:

Misfire condition
Malfunctioning or improperly adjusted EGR valve
Failed oxygen sensor
Leak in exhaust tubing upstream of converter
Excessive carbon deposits in combustion chamber
Improper spark advance
Blocked coolant passage
Overly lean air-fuel mixture
Damaged cold air duct
Failed or malfunctioning catalytic converter
Corroded or damaged engine sensor electrical connections

Please note that while a failed catalytic converter will contribute to high NOx readings, the failure in itself may have been caused by some other upstream performance problem. In all cases, it is crucial to identify the root cause of the problem before blaming the converter.

Case Study
" I'm working on a 1992 3.1-liter Chevrolet that failed in the test lane. The results were very good for HC and CO—nearly zero—but it failed for NOx. The converter seems to be operating properly and the engine is running okay. What's causing the problem?"

Answer: Because this application, like many others, does not have an EGR adjustment, there's little the technician can do to "tweak" the engine's performance to bring it into compliance. It's clear the engine is running overly lean. A lean engine operating condition produces more NOx than usual, and the lean exhaust chemically interferes with the converter's ability to clean NOx (remember that excess oxygen is good for cleaning HC and CO, but bad for NOx).

There are dozens of potential causes of the high NOx readings, ranging from the relatively easy (detonation or failed oxygen sensor) to the extremely difficult and time-intensive (an improperly signaling MAP sensor). Because the engine is otherwise performing satisfactorily, the least expensive option may be to upgrade to a heavier duty converter such as a CleanAir "Premium" unit featuring increased catalyst for greater efficiency.



home :: auto parts store :: performance exhaust :: shocks :: mufflers :: catalytic converters :: auto parts news :: sitemap :: contact us

ImageBuilders Web DesignImageBuilders Web Design

type this page key phrase here, catalytic converters, discount catalytic converter, direct fit catalytic converters, universal catalytic converters, o2 sensors

type this page key phrase here, catalytic converters, discount catalytic converter, direct fit catalytic converters, universal catalytic converters, o2 sensors
Dynomax's Powerstroke Exhaust Systems Will Gain You MONSTER Increases in Horsepower and Torque.

type this page key phrase here, catalytic converters, discount catalytic converter, direct fit catalytic converters, universal catalytic converters, o2 sensors

type this page key phrase here, catalytic converters, discount catalytic converter, direct fit catalytic converters, universal catalytic converters, o2 sensors
MagnaFlow means
WIDE OPEN PERFORMANCE. Straight-through with no restrictions. No restrictions equals better flow, and better flow equals more horsepower.

type this page key phrase here, catalytic converters, discount catalytic converter, direct fit catalytic converters, universal catalytic converters, o2 sensors

Copyright 2008
A-1Parts