There is no timing belt on 2.5L Fieros, the cam is gear driven.
You will need a timing light, set it at 10 degrees BTD
The 1988 Mitsubishi 2.0 liter engine timing marks can be found on the front main pulley. The timing marks will be scattered around the outside of the pulley.
diagram of timing belt
How do you replace the alternator on a 1988 Pontiac Fiero
6Deg +/- 2Deg
No the 1988 underwent a big upgrade
The marks are on the timing belt cover,and on the pulley for the crank.
2.8 and 2.5 liter celebrity engines do not have timing belts only chains.
10 degrees BTD
10 degrees BTDC with Spout disconnected.
10 degrees
10 degrees.