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Double check the spark plug wire firing order. The cylinder have to have voltage in a certain order. If you do not have a motor manual you can google for this information. just write for example: 2002 ford taurus 6 cylinder spark plug firing order. The firing order goes in sequence usually in a clockwise direction. For example: 1, 5, 3 ,6 2, 4 in a clockwise order. spark plug #1 wire goes to the coil then spark plug #5 wire goes on the coil in a clockwise rotation, next to where spark plug # 1 was connected. This would mean that spark plug number 1 will fire (or get voltage), then spark plug nuimber 5 will fire (get voltage), then spark plug number 3 and so on. The sequence will continue to happen over and over again as long as the car is on. Here's another tip! When it nice and dark outside, turn your car on with the hood open and look at your spark plug wires for any voltage jumping from the wires to the motor metal. Keep in mind you may have to tent yourself with a cardboard to see the voltage arcing to metal. It has too be super dark for you too see this fault. Any arcing will cause your engine to misfire and your engine light to come on. Hope this gives you a starting point to finding the problem. Good Luck.
did it misfire before the tune up? if not more than likely the firing order is wrong the wires we're put back onto the plugs incorrectly check the order other things that can cause this are fuel or even a vac. leak
FIRING ORDERS NOTE: To avoid confusion, remove and tag the spark plug wires one at a time, for replacement.
If a distributor is not keyed for installation with only one orientation, it could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes in your book to reflect how your engine is wired.
Fig. 1: 1987-91 2.5L engine Engine Firing Order: 1-3-4-2 Distributor Rotation: Clockwise
Fig. 2: 1992-95 2.5L engine Engine Firing Order: 1-3-4-2 Distributor Rotation: Clockwise
Fig. 3: 4.0L and 4.2L engine Engine Firing Order: 1-5-3-6-2-4 Distributor Rotation: Clockwise
Sounds like you have the firing order right but your off on the #1 on the distributer. Every time you get an explosion coming from the carb its misfiring. Find the #1 on dist and continue with firing order
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.
make sure to check the firing order, that means every plug wire has to go to a specific spark plug, if you unplug all or more than one plug wire at same time, you might mix it, and that should be all your problem just get a firing order specifications and have it done.