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> Training > Mechanical & Variable Timing & Valvetrain Diagnostics


Mechanical & Variable Timing & Valvetrain Diagnostics

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Ccomplex timing and valve train systems are common.  Position sensor codes are often mechanical or variable timing faults.  Variable valve timing (VVT) codes are often mechanical timing faults or lubrication issues.  Even Fuel Trim, MAF, MAP, and other codes and symptoms can be caused by a variety of timing and lift faults. When it really is a VVT system fault, it’s hard to tell if the root cause is an oil, solenoid, actuator, or other mechanical fault.  What’s needed is a repeatable strategy to avoid testing ‘everything’, and instead quickly eliminate possible causes.  

This manual covers almost all Asian VVT systems and VW & Audi and helps you determine the best tool & test combination to rule out the most possible causes in the least amount of time. When PIDs aren’t available, use controls. When controls don’t work, there are jumper wires. Or you can use oil, vacuum & compression gauges, Lab Scope CMP/CKP comparisons, and other simple tests you’ll never see in a flowchart. As you will learn from the book, you should never perform all of them!

• Hydraulic, Electronic & Magnetic Clutch VVT systems
• Variable lift & valve clearance faults
• Finding stretched/jumped timing without disassembly
• Differentiating mechanical & VVT failures
• Stuck actuators vs. stuck solenoid diagnostics
• Finding internal oiling faults from the outside
• Leverage Scan Tool PIDs & functions to eliminate the most possible causes with the least effort

It’s all related!  Only by treating mechanical timing, variable valve timing, valve train and lubrication all as a single system can you quickly find out what’s not wrong and zero in on a root cause.  Diagnosing each of these variables individually results in incorrect or partial diagnosis that costs everyone involved a lot of time and money.  For example, many VVT components fail functional tests and are replaced, only to find that the oil pickup screen is clogged, the timing chain is stretched, a main bearing has failed, etc. We’ve included dozens of real-world examples to prove the point.  

Table of Contents

• Valves & Clearance
• Mechanical Timing
• VVT Components
• VVT Testing Strategies
• Procedural Problems
• Relearning
Timing & Valve Indicators
• Trouble Codes
• Code & No-Code Misfiring
• Breathing & Drivability
• Noise Diagnostics
• Vacuum & Compression
• Case Studies
Mechanical & Variable Timing
• Acura & Honda
• Toyota, Lexus & Scion
• Audi & VW
• Nissan & Infiniti
• Hyundai & KIA
• Subaru
• Mazda
• Mitsubishi
• Case Studies
Variable Valve Lift
• Acura & Honda VTEC
• Acura & Honda VCM
• Toyota, Lexus & Scion VVTL-i
• Audi AVS
• Nissan & Infiniti VVEL
• Subaru AVLS
• Case Studies



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