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Are you up to speed on OBD II? You should be because starting in 2002, a number of states have announced plans to change their emissions testing programs over to OBD II....
Distributorless Ignition Systems (DIS)
If an engine cranks but won't start, is it fuel, ignition or compression? Ignition is usually the easiest of the three to check because on most engines, all you have to do is pull ...
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Onboard diagnostics demystified
Since the mid-1990, no vehicle innovation has done more for vehicle service and repair than on-board diagnostic (OBD) systems. But in order for it to work, you must first break the OBD code.For engine misfire problems occurring in tuned/modified Po...
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OBDII: PAST, PRESENT & FUTURE
All 1996 and newer model year passenger cars and light trucks are OBDII-equipped, but the first applications were actually introduced back in '94 on a limited number of vehicle models.What makes OBDII different from all the self-diagnostic systems th...
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OBD II AND EMISSIONS TESTING
Are you up to speed on OBD II? You should be because starting in 2002, a number of states have announced plans to change their emissions testing programs over to OBD II.Instead of doing a tailpipe emissions check on a dynamometer, an OBD II check is ...
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INTRODUCTION TO ENGINE MANAGEMENT SYSTEMS
The performance and emissions that today's engines deliver would be impossible without the electronics that manage everything from ignition and fuel delivery to every aspect of emissions control. Electronics make possible V8 engines that deliver exce...
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INTRODUCTION TO EMISSIONS SYSTEMS
When the first emission controls were first introduced back in the late 1960s, they were primarily "add-on" components that solved a particular emission need. When positive crankcase ventilation (PCV) became standard in 1968, the recycling of crankca...
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Distributorless Ignition Systems (DIS)
Distributorless ignition systems (DIS) have been around for almost a decade now, and have eliminated much of the maintenance that used to be associated with the ignition system. No distributor means there's no distributor cap or rotor to replace, ...
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DIAGNOSING THE BATTERY, CHARGING & IGNITION SYSTEM
Well, you know the problem area, now what? You turn to your repair information and there is a diagnostic flow chart for the problem. Great!! Following the flow chart and going from "branch to branch" (sometimes referred to as a trouble tree chart), y...
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DIAGNOSING THE BATTERY, CHARGING & IGNITION SYSTEM
What do you really need to know about diagnosing and repairing starting, charging and ignition systems? Two things, basically: that electrical and ignition problems are often difficult to diagnose (especially intermittent faults), and that a LOT of e...
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Diagnosing Misfires
Misfire is a common driveability problem that may or may not be easy to diagnose, depending on the cause. A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. The loss of 25% of the engine's power output is the equivale...
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DIAGNOSING LIGHT-DUTY DIESELS
Diesel engines are real misers when it comes to sipping fuel. They're also known for their pulling power and rugged durability. That's why diesels continue to be a popular option in many pickup trucks today. But diesels are also known for their idle ...
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