I am trying to set ignition timing on my 1984 fiero. when I on hook the wire at the computer or hook the wire back up the timing does not change. I can set the timing with a timing light but nothing changes when I hook the wire back up. what is the problem? thanks dave

You should not need to unhook any wire. Are you talking about the ALDL connector under the armrest?

manual says to unhook this wire when timing. thanks for your reply dave

You check and adjust the timing with the aldl connector jumpered. The timing you read when you remove the jumper is not relevant.

quote Originally posted by dasivesind: manual says to unhook this wire when timing.

Which manual is that? Which wire is that?

quote Originally posted by dasivesind: what is the problem?

The "problem" appears to be the manual you're consulting. Tell us what you're reading!

what do you mean by jumpered and too what? thanks for your replies dave

We seem to all be asking questions with no answers.....

How about this: A video for timing the V6, but the jumper part is the same for the 4 cylinder.

Setting Timing - 84-86 2.5L

It's the same for both the Manual and Automatic: 8 degrees BTDC.

Warm the car up until it idles at 1000 RPM. I generally run mine until the temperature gauge reaches it's normal operating reading (first tick mark).
With the car running, jump pins A and B on the diagnostic connector (beneath center console cigarette lighter panel) to place the EST unit into base timing mode (electronic spark advance disabled).
Using a timing light set timing to 8 degrees as an average of cylinders 1 and 4. They are usually both pretty close, so if it's a hassle to get to #4 (snorkel in the way, etc) just use the #1 reading. The timing scale is located on the passenger side of the engine, just above the crankshaft pully. The timing mark is on the pulley.

The whole procedure is really simple, and should take you less than 15 minutes.

If the timing was way out (> 4 degrees or so), you might want to do a recalibration.

thanks for the info I will give that a try. dave

We'd still like to know what you were trying to do previously.