.044 inch ( according to motorcraft . com )
If it is the 2.3L it probably has 8, 2 for each cylinder which is mainly for ease of starting and getting ~15% better gas mileage.
According to one of Fords websites : A 1990 Ford Probe , 2.2L four cylinder engine has the spark plugs gapped at : ( .044 inch )
The 2.3 liter 4 cylinder engine has ( 8 spark plugs ) , twin plug ignition system The 2.9 liter and 4.0 liter V6 engines have ( 6 spark plugs )
8 spark plugs
The 1990 Ford Mustang 2.3L SOHC had 88HP
A spark plug diagram for a 1990 Ford Ranger typically shows the location of the spark plugs along the engine's cylinder head. The Ranger's engine options include a 2.3L four-cylinder and a 4.0L V6, with the spark plugs positioned accordingly—four for the four-cylinder and six for the V6. Each spark plug is connected to an ignition coil or wire, which is essential for engine ignition. For detailed visuals, it's best to refer to a repair manual specific to the vehicle.
arnt all spark plugs just below the valve covers on all engines ???
how the sequence of spark plugs goes on the engine of 1990 Toyota cressida
You should find it in the drivers side cylinder head between spark plugs #3 and #5.
The firing order for the 1990 Honda CRX, which is equipped with a 1.6L engine, is 1-3-4-2. This means that the spark plugs should be wired in the sequence of cylinder 1, followed by cylinder 3, then cylinder 4, and finally cylinder 2. Ensure the ignition coil is connected properly to maintain the correct firing sequence for optimal engine performance.
They are right there on the top of the engine.
Don't try it.