Misfire after plug change

[huesey1974]

Need some help, I changed the plugs on drivers side and started her up and CEL came on and is misfiring, Plugs are defo in proper and im a bit worried. I have changed plugs on loads of cars and are usually very easy but the Porsche not so, Im wondering if the coils are seated properly. Do the screws seat them properly or do they need a good shove in as im thinking maybe the furthest rear coil didn't pop in and was a little proud when I put the screws back in. Any thoughts?

Thanks

[Loren]

The most obvious are:

1. Are all the spark plugs tightened down? (I've forgotten one myself before).

2. Are the electrical connector on the coil packs firmly snapped in place?

3. Push the coil pack on each spark plug firmly until you feel the contact - then tighten the screws down (as they just keep them in place).

If all of the those are okay - then it will be time to get the ohm meter out.

[huesey1974]

Hi,

Im going to have another go in the morning, Plugs were defo tightened but I thinking a coil is not seated properly or the electrical connector as I had a problem with one of them. Will let u know.

Cheers

[devin_wala]

I changed the plugs at the same time I switched out my IMS, AOS and chain tensioners. Scared the synthetic out of me with the stumbling engine and CEL light coming on. I had tried to replace the plugs without dropping the mufflers and I apparently wasn't able to get it quite right with such as small space to work in. For me it was item 2 on Loren's list. In my case this was easily addressed once I retried the plug install with the mufflers dropped. Hope your issue turns out as simple.

Kind Regards

[huesey1974]

Job done!!! Not much skin left on my arms but she's done and feels even better to drive, Misfire was a electric connector plug not seated properly, Not sure if they were the original plugs (Beru) but they looked done anyway, Cleaned all the coils. Noticed 2 of the coils were different part numbers and the seating bolts were harder to get out so think they must be originals too. My exhaust manifolds don't look great right enough so may replace these in the near future. Bone dry underneath regarding oil leaks so that's good.

thanks