Question about 1983 Volvo DL

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Ithink my spark plug wires are in the wrong order, how do Ifind t

I think my spark plug wires are in the wrong order, how do I find the right order?

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On any four cylinder engine the firing order is always 1-3-4-2. Cylinder 1 is at the front of the engine, the same end as the timing chain and the opposite end to the gearbox.

Remove the spark plugs and manually turn over the engine until the timing marks line up (down by the crankshaft pulley). You can use a socket on the crankshaft nut to turn the engine bit by bit, the purpose of removing the spark plugs is to prevent cylinder compression making it easier.

Once the timing mark has lined up, remove the distributor cap and observe the position of the rotor arm and briefly pop the distributor cap back on: the lead exiting the cap above the rotor arm should go to cylinder #1. The next quadrant that the rotor arm advances as you turn the engine over to will be the position that the lead for cylinder #3 attaches. By the same process you can then identify where the leads to cylinders #4 and #2 go.

When finished, ensure that the distributor cap is securely fastened and refit the spark plugs: if they're taper seat spark plugs (no washers) then when they just get tight then tighten no more than a further 1/6th of a turn. If they have washers then it's an extra 1/2 to 3/4 of a turn and a bit more if they're brand new plugs where the washers have never been compressed. Refit the leads in the correct order which you've just established and make sure that they're secure and you should be good to go unless there's another problem.

Posted on May 26, 2010

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