1993 Hyundai Scoupe Logo
Terry McCluskey Posted on Nov 08, 2013
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Still back firing though plug wires renewed - 1993 Hyundai Scoupe

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john levy

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  • Posted on Nov 09, 2013
john levy
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Backfiring equals pre-ignition caused by an engine that is out of timing. Shop work!.. backfiring can cause major problem with the valves.

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Tune it up. New spark plugs if they are over 50,000 miles old.

Backfiring is typically a symptom that occurs with a gasoline engine that has spark plug wires crossed, spark cross firing inside the distributor cap in dust or condensation or an over lean condition.

If it runs smoothly when normal cruise it wouldn't be crossed wires so that leaves an over lean condition or cross firing in the distributor cap as the most likely causes. So check the inside of the distributor cap for moisture, dust etc and clean it if you find it.

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Firing order:
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Sounds as though you have plug wires wrong.
Firing order is 1-8-4-3-6-5-7-2

Distributor Ignition System:
Distributor rotates Clockwise. (Rotor)
Find Number 1 tower on distributor cap, go Clockwise with Firing Order.

Distributorless Ignition System:
VIEWING the engine from the Front of the car.

Spark plug wire connections along the back, starting from Left side going to Right side;
2-3-7-4

Spark plug wire connection towards the Front of the engine;
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(To guess I would say you have 5 and 7 wires switched)

Left side cylinder order is 1-3-5-7, going from front to back.
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Right side cylinder order is 2-4-6-8, going from front to back.

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Tired of buying parts after parts

Hi

It sounds as though the distributor is giving up the ghost.

Can you hear any sparking inside the distributor? If so then the cap is tracked to earth and needs replacing. If you're not sure then remove the cap and look for any fine black lines which lead from the plug terminals to the base of the cap or to another terminal. These are conductive tracks and they drain away the current which creates the spark, so weakening the spark.

Is the rotor in good condition? If not then renew it.

Otherwise you need a new distributor.

Regards

Geordie
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