Hi all,

About two weeks ago I got the car washed at a touchless place near my house I've been to many times before. On the way home at a stoplight it started idling rough (at first I thought I might have blown an engine mount). The engine was shaking the whole vehicle. Under power, it sounded like the clatter of a diesel. Through a check engine light briefly. I got home parked it, tried it the next day, ran perfect.

A few days ago I was driving in the pouring rain from Madison to Milwaukee (about 80 miles). After about 60 miles of running great, it suddenly started running rough, and the CEL came on. I got off the interstate and parked it for about 15 min. Started it up again, seemed to run fine, but CEL still on. I got home parked it, and haven't started it since.

I plugged in my Durametric and got codes for misfire on cylinders 1,3,5. Car has 76,000 miles, I replaced the plugs (but not coils) at about 60,000. I believe 1,3,5 are all one side of the engine, correct? I do have an IMS guardian, it's no where near going off (it gets progressively louder with more debris) so no one say IMS!

Any ideas?

Thanks in advance and thanks if you read everything.

Oh, and I did search, there's some good info here: https://rennlist.com/forums/996-foru...ing-issue.html

 

replace coils. they crack especially with 76K miles

 

Coil plastic casing is probably cracked, water gets in and grounds it out. Had this happen to mine. Either change them or cover the entire top of the coils with RTV. The problem is water getting into it, if you can stop that, the coils will be fine.

 

They sell these blue pills for that nowadays

 

^naught naughty

 

Coils was my first thought, but it seems weird that all of a sudden 3 of them on one side of the engine would go bad.

 

Follow up, because I hate when I search through threads only to find no answer. Since it's been about 18* lately in Wisconsin (no heated garage), and I'm tired of working on cars (just did a brake job, and replaced ignition switch on the Porsche, + new bumper/winch, fender flares for the Jeep) I took the Porsche into the dealer. They agreed new coils were in order, I had all 6 replaced. I asked if they could price match Suncoast for parts, they checked into it, but said no. However, I was able to provide my own coils, and pay for 2 hours of labor. That seemed fair enough to me.

 

gotta love dealers


NO

gee thanks!

 

That's great that the dealer did that for you. Most shops will make you buy the parts from them. Kudos to the dealer.

 

They way over charged him on labour, so they made their profit there. This should not be more than an hour to change.