I took off my plug wires on my distributor cap on my 1990 mercury topaz and i dont know the firing order to reconnect them

The main thing is to read that check engine light code. That will give you the answer, but maybe incorrect firing order is causing it?

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So check on the firing order FIRST. When changing the distributor cap, you should do one wire at a time off the old one. Same for replacing spark plugs, do one at a time. Having one lead in the wrong place is a sure fire way to get real real rough running.

https://www.google.com/search?q=1994+mercury+topaz+4+cylinder+firing+order

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Drive out cam gear pin & remove gear

Firing order 1-3-7-2-6-5-4-8 --------- front ' 1 2 3 4 ' of ' 'distributorless ignition vehicle ' 5 6 7 8

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I do not have a breakdown diagram for a distributor, but just the firing orders and description of ignition system for the Dodge Colt and related models (based on Chilton manuals) if that's what you're looking for: FIRING ORDERS Fig. 1: 1990 1.8L SOHC Engines Firing order: 1-3-4-2 Rotation: clockwise

Fig. 2: 1.6L DOHC Engine Firing order: 1-3-4-2 Distributorless Ignition

Fig. 3: 2.0L Engine Firing order: 1-3-4-2 Rotation: clockwise

Fig. 4: 1.5L Engine Firing order: 1-3-4-2 Rotation: counterclockwise

Fig. 5: 1993 1.8L Engine Firing order: 1-3-4-2 Rotation: counterclockwise

Fig. 6: 2.4L Engine Firing order: 1-3-4-2 Rotation: clockwise

To avoid confusion, replace spark plug wires one at a time. --- Distributor REMOVAL & INSTALLATION Although the distributor can be removed from the engine no matter which cylinder is about to fire, it is a good idea to have number one cylinder at TDC before distributor removal. 1.5L, 1.8L, 2.4L SOHC Engines

1. Disconnect the negative battery cable.
2. Disconnect and tag the spark plug wires from the distributor cap.
3. Disconnect the distributor harness connector.
   Fig. 1: Ignition system for the 2.0L engine
   
   Fig. 2: Ignition system for the 1.5L engine
   
   Fig. 3: Ignition system for the 1992-93 1.8L engine
   
   Fig. 4: Ignition system for the 2.4L engine
   
   
4. Loosen the distributor retaining bolt and remove the distributor from the engine. To install:
   
5. Rotate the engine until No. 1 cylinder is at TDC on its compression stroke. NOTE: Be careful not to turn it to the No. 4 cylinder TDC on its compression stroke by mistake.
   
6. Align the distributor housing and gear mating marks.
   Fig. 5: Ignition system for the 1990 1.8L engine
   
   Fig. 6: Distributor installation for the 1990 1.8L engine
   
   Fig. 7: Distributor installation for the 1992-93 1.8L engine
   
   
7. Install the distributor into the engine, while aligning the fine cut (groove or projection) on the distributor flange with the center of the distributor mounting stud.
8. Install and tighten the distributor retaining bolt.
9. Reconnect the distributor harness connector.
   Fig. 8: Distributor installation for the 2.4L engine
   
   Fig. 9: Distributor installation for the 1.5L engine
   
   Fig. 10: Distributor installation for the 2.0L engine
   
   
10. Install the distributor cap and spark plug wires.
11. Reconnect the negative battery cable.

For the 1989 Mercury Topaz 2.3L In-Line 4-Cylinder:

Firing Order:
1-3-4-2
Cylinders:
........(back).........
|...1...2...3...4...|
........(front)
Distributor:
....(back)
(+)...4
...............2
3
........1...(+)-screw
....(front)

Let me know if this helped...

Is the coil connected to the ditributor? did you knock any connections off in the process? Does it turn over but not fire? do you have spark at the plugs? Are you sure of cylinder location in respect to firing order? Did you-and check this first as with any elec. problems-blow a fuse in the ignition circuit? good luck!

the distributor is held by a clamp bolted to the block where the 'stem' enters the block.remove cap and mark position of rotor to ensure proper ignition timing upon re-assembly,note firing order of plugs.if a 'no spark condition exists,check 'pick-up module 'bolted to the side of distributor,below cap,a hex head 'special tool' is available to remove module w/ distributor in place. these modules are only rated for 50K miles.

The firing order is 1-8-4-3-6-5-7-2.
The distributor rotates in a clockwise direction. The engine must be on the compression stroke on the #1 cylinder. Line up the timing marks. Remove the cap and the rotor should be pointing to approximately the 5 o'clock position.

Good Luck

On that year the cap is screwed on.