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Amateurs and Hacks Provide Job Security For Automotive Service Professionals

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Acura: Clunk Noise While Turning

Model: Acura RSX 2005-’06 Symptom: The front suspension makes a ­clunking noise while turning. Probable Cause: The front springs are moving on the spring seats. Corrective Action: Replace both front springs and do a four­-wheel alignment. Diagnosis:...

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Inside Import Car Collision Warning, Automatic Braking Systems

Anything that moves under its own power also has to stop, so brakes have been a safety feature on cars since day one. Over the years, technical innovations such as antilock brakes (ABS) have ­improved the ability to stop with minimal skidding on...

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Rotor Failure: Why Rotors Crack and Make Noise

The prices of rotors seem to be dropping the past few years. Call just about any parts supplier and they can quote you a vast range of prices for the same application. And when you compare the rotors side-by-side, they may look the same, but the difference...

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Wheel Bearings: Measurement and Torque

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Why Alignment Angles Change

An alignment angle doesn’t change randomly. There is a cause-and-effect relationship between external and ­internal forces that can alter the geometry of a vehicle’s suspension. Having the alignment reading for only one angle on one corner is just...

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Bendpak Breaks Ground On New Warehouse and Shipping Complex

    BendPak, Inc. announced the recent groundbreaking to celebrate beginning construction of a 67,000 square-foot multipurpose warehouse and shipping center located on 3.7 acres of land in Santa Paula, CA. The new 67,000 square-foot...

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Pulling Codes: 7 Common Causes of Misfire Codes

A flashing check engine light and a P0301 to P0312 diagnostic trouble code (DTC) is a surefire indication that one or more cylinders are misfiring. Occasional misfires may pass unnoticed, but a steady misfire is hard to miss. The engine usually feels...

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Analyzing the Cylinder Pressure Waveform from a Running Engine, Part 3

By Vasyl Postolovskyi and Olle Gladso Contributing Writers and Instructors at Riverland Technical and Community College in Albert Lea, MN   In Part 1 of this Maximizing Tools series, we discussed an alternative approach to diagnosing an engine...

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Home Emissions Tech Tip: Dodge Neon Sport Code P0340 Intermittently

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Some 2004-’05 Dodge Neons will intermittently experience a P0340 code. Here are two fixes to consider.

Vehicle Application: 2004-’05 Neon 2.0L

Customer Concern: Bucks and misses intermittently while driving. Code P0340 is stored.

Potential Cause: Camshaft position (CMP) sensor.

Tests/Procedures
1. Unplug the CMP sensor to see if the symptoms can be duplicated.

2. If yes, inspect the connector and if OK, replace the CMP sensor.

Tech Notes: This engine would not run over 2,100 rpm with the CMP sensor unplugged. It would start but had very long crank time.


Vehicle Application:
2005 Neon 2.0L

Customer Concerns: Codes P0340 sets intermittently. Engine dies out for the customer; runs OK for a period of time, then customer has to drive a long time before it will act up again.

Potential Causes: CMP sensor.

Tests/Procedures
1. Monitor the 5-volt power supply (orange) to the CKP and the CMP. If it goes low when it acts up, unplug the vehicle speed sensor (VSS). The VSS shares the power supply circuit for the CKP and the CMP. Replace the VSS if that brings the voltage back up.

2. Verify both the CKP and the CMP signals with a labscope and compare to a normal pattern.

Courtesy of Identifix.

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