However, with the L-Jetronic system our cars use, about 90% of the complexity deals with about 5% of the running. In other words most of the system’s components deal with things like cold starting, warm up, idle, full throttle etc. That means that by the time you have checked and adjusted everything that affects idle you have really checked and adjusted most of the injection system.
4/14/2020 · GREG’S BOSCH L – JETRONIC FUEL INJECTION IDLE ADJUSTMENT , DIAGNOSTIC AND TUNE UP PAGE, Latest revision Sept. 4th 2003 includes changes to the introduction, Step one, testing procedures for the Altitude Compensating Device on Step 10 and the creation of Step 12 which involves advanced Air Flow Meter instructions for adjustments for Max power and …
6/5/2003 · Bosch L-Jetronic idle adjustment , diagnostic and tune up article. Introduction, please read this first: So many People ask questions about idle problems that I decided to write complete idle adjustment instructions. However, with the L – Jetronic system our cars use, about 90% of the complexity deals with about 5% of the running. In other words …
12/31/2013 · NOTE there are a few things I should mention: 1) I am NOT adjusting a stock AFM on a stock motor. So I will be going more teeth one way or the other than is …
So many people ask about idle problems that I thought I would write complete idle adjustment directions. However, with the L – Jetronic injection system our cars use, about 90% of the complexity deals with about 5% of the running. In other words most of the L -Jet’s parts are there to deal with idle , cold start, warm up, full throttle etc.
Adjust the average at idle speed so it is within +/- 10% of the reading at 2500 RPM. That is, if the duty cycle at 2500 RPM is 40%, at idle it should be between 30% and 50%. On 1986/87 cars the specified idle setting is between 5% and 15% greater than that at 2500 RPM. After each adjustment wait 5 or 10 seconds for the idle mixture to stabilize.
sensor precedes charging of the cylinders. In addition, idle stability is improved. The design of the L-Jetronic allows for fewer compensating adjustments during the operating cycle of the fuel injection process as compared to the D-Jetronic. This approach provides a more accurate fuel – air ratio that optimizes performance under varying requirements.
Title: VW L-Jetronic Fuel Injection Workshop Manual Author: Robert Bosch Keywords: VW L-Jetronic Fuel Injection Workshop Manual Created Date: 1/23/2006 12:00:00 AM, Diagnosis: Engine idles too low, or rough idle : 23/24 – Diagnostic process Diagnosis: Hesitation: 25/26 – Diagnostic process Diagnosis: Inadequate power & poor performance: 27 – Diagnostic process 28 – Diagnostic process (continued) Diagnosis: Excessive fuel consumption: 29/30 – Diagnostic process Diagnosis: CO value too high:, L Jetronic Fuel Injection Fuel Basics Components Fuel Storage & Delivery Troubleshooting … Idle speed adjustment screw (on the front of the 928 engine, behind and below the oil fill/cooler) Throttle valve switch (on throttle body – older 928s have two switches, one for WOT and one for idle , not contained in a single unit as shown here.) …
