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You can get a Bluetooth OBD II device and an App call Torque. You can monitor the long term and short term fuel trim. This will tell you if the O2 sensor is adding gas or taking gas away from the mixture. If the O2 sensor is always taking gas away from the mixture you have a problem with a rich mixture, and a rich mixture will eventually destroy your new cats.
Torque will also list pending codes. Like TerminatorX5 stated after so many misfires the DME will throw up a check engine light, however, every time you shut down the engine, the computer will reset the number of misfire code so it will always start at 0 when you first start the engine. If it hasn't reach the number require for a check engine light by the time you shut the engine, it will restart the count the next time.
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2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD
Last edited by upallnight; 08-13-2013 at 10:46 AM.
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