Encountering a check engine light in your 1987 Oldsmobile Delta 88 can be concerning. While modern vehicles use OBD2 systems, your classic Delta 88 utilizes an earlier OBD1 system. Understanding how to interpret the check engine light on your 1987 Oldsmobile Delta 88 is the first step to diagnosing potential issues and keeping your ride running smoothly. This guide will walk you through the process of accessing and understanding the diagnostic codes for your vehicle.
The 1987 Oldsmobile Delta 88, being a pre-OBD2 model, requires a slightly different approach to retrieve diagnostic trouble codes compared to newer cars. Instead of plugging in an OBD2 scanner, you’ll be using a simple jumper wire to access the onboard computer’s memory and read the stored codes through the flashing check engine light. This system, while less sophisticated than OBD2, is quite effective for pinpointing problems within the engine management system of your vehicle.
To begin, locate the Assembly Line Diagnostic Link (ALDL) connector. On your 1987 Oldsmobile Delta 88, this connector is typically found under the dashboard, often near the center console. It’s a multi-pin connector that serves as the interface to the car’s computer for diagnostic purposes.
Pre OBD1 Diagnostic Connector Location
Once you’ve located the ALDL connector, you’ll need a small piece of wire to act as a jumper. The process involves bridging two specific terminals on this connector to initiate the diagnostic code readout. The terminals you’re looking for are typically labeled ‘A’ and ‘B’. Refer to the diagram provided or your vehicle’s service manual for precise identification if needed.
With the key turned to the ‘ON’ position (but engine not started), use your jumper wire to connect terminal ‘A’ to terminal ‘B’ on the ALDL connector. This action effectively puts the car’s computer into diagnostic mode.
Now, observe the check engine light on your dashboard. It will begin to flash a series of codes. These codes are two-digit numbers, and they are flashed in a specific pattern. For example, a code ’12’ is indicated by one flash, followed by a pause, and then two flashes. A code ’22’ would be two flashes, a pause, then two flashes.
The codes will typically be displayed three times, and the sequence will usually start and end with code 12, which is often considered a system start and end indicator. Carefully count the flashes and record each two-digit code. It’s important to note the sequence and count accurately to correctly interpret the diagnostic information.
Once you have recorded all the flashed codes, you’ll need a reference list of OBD1 codes for 1987 Oldsmobile Delta 88 to understand what each code signifies. These lists are readily available online or in repair manuals specific to your vehicle. Each code corresponds to a particular sensor, circuit, or system within your car’s engine management system.
By decoding these codes, you can narrow down the potential causes of your check engine light and focus your diagnostic and repair efforts effectively. Remember, while this guide helps you retrieve the codes, professional diagnosis and repair might be necessary to resolve complex issues. Understanding your 1987 Oldsmobile Delta 88’s OBD1 system is a valuable step in maintaining your classic car and ensuring its continued reliable performance.
