Iridium spark plugs
copyright 1998-2017 by Mark Verboom
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Go back to Citroen C1 1.0 12v

Iridium spark plugs

As they're not very expensive I ordered three Denso Iridium spark plugs for my C1.

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Usually engines respond pretty well to new sparkplugs and especially to iridiums. I've seen that effect on a few other cars I put them on. And as they're not very expensive and last much longer then normal spark plugs I decided to try a set.

Fitting is pretty straightforward. Remove the airfilter cover so you can reach the spark plugs.

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Then you have to remove the bolt that holds the ignition module in place.

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After the bolt is removed you can lift the module out.

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Using a ratchet with extension you can now loosen the original spark plug

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I like to unscrew them by hand just to have more feeling and prevent any issues if they don't come out smooth.

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Then lift the original spark plug out.

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You can clearly see the difference with the new iridium ones.

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Put some engine oil on the thread and insert the spark plug in the socket.

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Thread the new plug by hand, you have more feeling that way and prevent cross threads. Keep going until it is hand tight.

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As specified on the box, tighten with the ratchet somewhere between a 1/4 and 1/2 turn. That will make sure the seal ring is squashed.

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Repeat for the other cylinders, refit the air filter cover and you're done.

I noticed a nicer idle and a slight improvement in throttle response. Basically the same as I found on other cars :)