MikeGT

I had cracks in two ignition coils. Porsche part# is 98060290403. They run about $150-$160 each x10.
However, Beru makes them. If you research this company, they have outstanding reviews.
Next Day Auto sells them at about $360 for all ten shipped next day air.

https://www.nextdayauto.com/2004-porsche-carrera-gt/

800 miles later, no issues.

Decided to change all plugs. Tip: High Octane race gas does not have the needed cleaning additives found in good pump gas such as Chevron with Techron. I recommend a bottle of Techron (18 oz) added with a half tank.

After changing the plugs, the rough idle at start up is gone... like new again.

ByeEnzo

Thanks for the link to purchase coils. My car will occ show a CEL that goes away after a few drive cycles. Happens usually after the car is run hard. Probably has original coils that have cracked. Changing coils and plugs should do the trick.

One question....is the swap a DYI or best tackled by Porsche service?

BTW my order window on the '17 FGT is coming soon (Feb to April). When's yours?

991gtR

a bit off topic . but just had my clutch replaced and the dealer di the coils at the same time. before i took it in i had 1 warning light .. brake servo.. i got it back like this as well. anyone know what that means ... Porsche didn't seem to think it was a big deal .

cheers

W8MM

Brake servo light should extinguish a little while after cold start. Perfectly normal.

MikeGT

ByeEnzo (like the name), PM me for an option if you're in S CA, otherwise a dealer with a CGT mechanic would be my recommendation.

991gtR,
You just spent a new Harley to get a clutch done, and the Porsche dealer said your light is not a big deal? I think you already know the servo light goes out after about 30 seconds, so I think you are saying it stays on. I'm asking a friend and will let you know.

MikeGT

991gtR,
You may have a brake accumulator failure, which is supposed to hold high brake assist pressure in the braking system. it takes the place of the brake booster. You should have it replaced asap and avoid driving it.

991gtR

thanks for the info Mike and W8MM. I know you through robert and was at the PECLA with my matte 918. The car was at the dealer for 1 month and they recommended the coils but did not say anything about the brake servo light. I did't know about it going out after 30 secs . DO you need to actually drive it or can it idle and still turn off. Going to make sure that the light isnt going off. do you know any trusted shops shops in SoCAL . Thanks.

LOL . I'm so happy that i had a free clutch with the purchase of my cgt. taking the old clutch and see if i can use it as backup . it wasnt't slipping to bad . but was bad when i drove it kinda hard on the track(ACS) last month.

Johnb55

Start it and don't drive until the brake servo light extinguishes, it takes about 30 seconds if you haven't driven it in a while.

unotaz

You will ALWAYS get the brake servo light during every single cold start. I always just let the car warm up and the lights would disappear after about 30s or so. This is actually stated in the CGT Service Manual.

991gtR

thanks alot gonna make sure that is the case . its a new car to me

ByeEnzo

[QUOTE=MikeGT;13906722]ByeEnzo (like the name), PM me for an option if you're in S CA, otherwise a dealer with a CGT mechanic would be my recommendation.

Thanks. I ordered a set of ignition coils. I'm in DFW and my dealership mechanic can install them.

bojali

the cgt coils are the same ones used in the Cayenne. check the archives, this was mentioned a few years back. the 980 coils are just overpriced cayenne coils.