Diagnostic Dilemmas: Multiple Failure Diagnostics On High Mileage Engines
Gary Goms explains that in tough economic times, a driver has no way of knowing how many maintenance-based and component-based failures will accumulate before he or she can afford to have a technician investigate the problem once a Check Engine light comes on.
Phaser-Style Variable Valve Timing System Controls And Operation
Phasers commonly can be found on just the exhaust cam or on both the intake and exhaust cams.
Tech Tip: Subaru Impreza With DTCs P0705, P0851, P2746, P2750 And/Or No Crank, No Start
If you receive a customer concern of a Check Engine light, AT Temp light or a no engine crank condition, the wiring harnesses to the transmission range sensor (inhibitor switch) should be closely inspected for damage or a short circuit to the CVT transmission case.
Diagnostic Solutions: No-Code Sensor Failures
Import Specialist Contributor Gary Goms takes a look at how to utilize one or more scan tool features to detect an intermittent, no-code sensor failure.
Tech Tip: Kia Check Engine Light Is On With MAF Sensor Code
Kia Rio’s check engine light is on and there is a mass air flow (MAF) sensor range/performance code in the system. The engine will hesitate at times.
Tech Tip: Replacing an AF10058 MAF Sensor with a Probe-Only Design
Contamination is a key reason why mass air flow (MAF) sensors fail and require replacement. As air, dirt and other debris get into the sensor, the parts become contaminated and result in failure. Drivers often notice sluggish performance, rough idling or even stalling. There may also be a more frequent need to refuel.
Acura Tech Tip: Multiple VSA DTCs Due to Brake Switch
VSA Indicator or Trailer Stability Assist Warning is on intermittently with DTC 59-1, 66-1, 67-1 or 69-1 present. Also, won’t come out of park.
Tech Tip: Kia Experiences Hesitation/MIL On, DTC P0123
Some 2001-’06 Optima models equipped with the 2.5L or 2.7L (V6) Delta engine and some Sportage models equipped with the 2.7L (V6) Delta engine, are applicable for this bulletin.
Tech Tip: Volkswagen Has MIL On, DTCs P1355, P1358, P1361 or P1364 Stored in ECM Fault Memory
This tip is associated with 2002-’04 2.0L Golf, Jetta, New Beetle and New Beetle Convertible vehicles.
Returning Engine Power Through Fuel Injection Service
Over time, fuel injectors will become flow restricted from both the deposits that the gasoline leaves in them as it flows through the injectors and the carbon deposits that form on the head of the injectors, causing engine driveability issues
Tech Tip: Audi MIL Is On, Misfire DTCs P0300-P0312 Set
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); DTC P0301-P0312 (Cyl. 1-12 Misfire Detected).
Tech Tip: Kia Constant Variable Valve Timing (CVVT) 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 below before replacement.