What is the correct timing for a 1990 Pontiac Transport?

There's no single "correct" timing for a 1990 Pontiac Transport. The timing depends entirely on the engine it has. Pontiac Transports from that year were available with several different engines (e.g., 2.0L, 2.5L, and possibly a V6). Each engine has its own specific timing specifications.

To find the correct timing, you need to:

1. Identify the engine: Look for an engine code on a sticker under the hood or in the owner's manual. This code will help you determine the exact engine type and displacement.

2. Consult a repair manual: Once you know the engine type, obtain a repair manual specific to your 1990 Pontiac Transport and that engine. The repair manual will provide the correct timing specifications, including the degrees Before Top Dead Center (BTDC) or degrees crankshaft rotation. It will also detail the procedure for setting the timing correctly, which often involves using a timing light.

3. Use a timing light: You'll need a timing light to accurately set the timing. The repair manual will explain how to connect the timing light and interpret the readings.

Without knowing the specific engine in your 1990 Pontiac Transport, it's impossible to give you the correct timing. Providing the engine code will allow someone to give you a much more accurate answer.