Tech Tip: Nissan KA24 SOHC Engines
Many of you may have not seen this issue, but once it bites you, you will always remember the Nissan KA24 engine series in the SOHC configuration. When the timing chain, guides and tensioner get high miles and wear, the chain can actually start rubbing against the front of the block.
Mazda Tech Tip: Diagnosing Body Vibration At Cruising Speeds
Some vehicles may experience a body vibration when driving approximately 55 mph. This symptom is due to the characteristics of the No. 3 and No. 4 engine mounts. Modified No. 3 and No. 4 engine mounts have been established for service only. Customers having this concern should have their vehicle repaired using the following repair procedure.
Tech Tip: The Hybrid Compressor – Know The Difference
HVAC systems differ from one hybrid to the next, and some systems have used a scroll compressor, which can be powered via a belt when the engine is running, or electrically when the engine is off. Most of the newer hybrids have changed to an inverter compressor, which is a high-voltage electrical motor.
Tech Tip: Volkswagen Check Engine Light Is On With Trouble Code P2187
The check engine light is on, with trouble code P2187, too lean off idle bank 1. This “Fast Fix” from Identifix shows how one tech solved this issue.
Tech Tip: Hyundai Power Steering Pump Whine
Before replacing a power steering oil pump for a “whine” noise condition, check the oil pump reservoir filter screen for contamination. If the filter screen at the bottom of the oil pump reservoir is clogged, it may cause the pump to aerate and produce a “whine” noise.
Tech Tip: Mercedes-Benz Noises, Vibration At Steering Wheel With A/C Switched On
If you receive customer reports on Model 209.372/472 vehicles of a groaning noise and vibration felt in the steering wheel at engine speeds between 800 and 2,000 rpm and with the A/C on, the cause may be the transfer of vibration from the A/C compressor through the high-pressure power steering hose to the steering wheel.
Fuel Pump Tech Tip: MIL On With DTC P0463 Or Erratic Fuel Gauge Operation
Some 2004-’07 Explorer four door/Mountaineer vehicles may exhibit the malfunction indicator lamp (MIL) on with diagnostic trouble code (DTC) P0463 or an erratic fuel gauge concern. This could be from sulphur contamination in the fuel, causing an open or high resistance on the fuel sender card.
Tech Tip: Kia Constant Variable Valve Timing Oil Control Valve Inspection
This bulletin provides information related to the oil control valve (OCV) used in constant variable valve timing (CVVT) systems. If, at any time, the OCV is suspected as a cause of rough idling, poor acceleration, camshaft timing misalignment-related trouble codes, misfire-related trouble codes, etc., on a Kia vehicle equipped with a CVVT system, be sure to perform the OCV inspection procedure in this bulletin before replacement.
Tech Tip: Toyota Knock/Pop Noise When Steering Wheel Is Turned
Some owners of select Toyota models may hear a clunk pop or knock-type noise when turning the steering wheel left or right. Use this procedure to lubricate the intermediate shaft and address customer concerns.
Tech Tip: Generation 1 Wheel Bearings With Integrated ABS Tone Ring
The front wheel bearings listed in this Tech Tip all share a unique design feature. They are all double-row angular contact with a split inner ring. The distinctive feature on these bearings is that one of the two seals on the bearing has a built-in magnetic impulse wheel. Caution should be taken to make sure that the seal with the ABS impulse ring is installed in the correct direction.
Volkswagen Tech Tip: Solving Suspension Creaking Noise
Select Volkswagen vehicles may exhibit a creaking noise originating in the front suspension while entering steep driveways or over large bumps. The source of this noise could be the forward inner control arm bushing. To confirm if this is the issue, raise the vehicle and remove the wheel on the suspected side.
Tech Tip: Audi MIL Is On
If an Audi customer complains that the engine has reduced performance without a significant loss of power or stalling, verify if Campaign 28F2/J1 has been performed (model years 2002-’07 only). Also determine if the vehicle is experiencing rough idle, the MIL is flashing or constantly illuminated, or one or more of the following DTCs are stored: DTC P0300 (Random/Multiple Cylinder Misfire Detected); or DTC P0301-P0312 (Cyl. 1-12 Misfire Detected).