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.
Tech Tip: Mazda Experiences Vibration at Cruising Speeds (55 mph)
Some Mazda 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.
A 360° Look Into the GM 60° 3.1L Engine
Over the years, GM has saved a bundle on manufacturing the 3.1L engine by using the production line tooling it originally developed for the 2.8L V6. By simply changing the bore diameter, the displacement of the same engine block could now be increased for more power and torque.
Service Solutions: The ‘CKP’ Script
The signal of the position or rotation speed of the crankshaft position sensor (CKP) contains a lot of information about the engine. When the engine is operating, the engine cylinders push on the crankshaft journal. This is why the crankshaft briefly accelerates after top dead center (TDC) on the expansion (or combustion) stroke. If the fuel did not ignite in the cylinder there would no acceleration.
Tech Tip: Chevy Malibu Suffers Engine Hesitation, Stalling, RPM Drop
Some Malibu owners may comment on the engine having a severe hesitation or a drop in RPM during parking lot maneuvers or during a deceleration. In a few instances, customers may comment on occasionally experiencing a stall at idle when the engine is fully warmed.
Driving Technology: The Quest for Improved Battery Output
The search is on for new materials to boost battery energy storage and output.
Tech Tip: Hyundai MIL On with DTCs Set and Fail Safe Mode, Harsh Engagement
An improperly functioning input speed sensor or output speed sensor may result in the following conditions: Check Engine light on; Harsh P-R or P-D engagement shock; Transaxle in third gear fail-safe; and/or Diagnostic trouble codes.
Pulling Codes: Hit or Miss? Part III
In the first two articles, we looked at cranking compression and tailpipe analysis. We will now explore in-cylinder analysis. In order to have an understanding of this concept, one must envision the four-stroke cycle at the time the plug fires as a reference. This denotes the end of our compression stroke, and the beginning of the power stroke for that cylinder.
Diagnostic Dilemmas: 8 Simple Rules …
Many of the “Diagnostic Dilemmas” Gary Goms is called upon to solve aren’t really all that complicated – but were caused by basic oversights and incorrect assumptions on the part of the technician. This situation has largely been caused by a lack of training and, in some cases, poor training.