Tampa 928s

I am having a miss and been looking at my coil grounds and it seems both ground cables are missing does anyone know where the grounds are attached to the block and coil?

Landseer

I don't have them on Euro 84 either. Been cleaning grounds all week (pelican thread) and didn't find them / not in the wiring diagrams either or any mention.

I know we bitch about them causing no starts for USA 32V cars, but am questioning that.

They just connect engine with the bracket on both sides. Maybe they are just for radio interference suppression on later cars?

There is a tech bulletin where a similar strap was added on the wiper motors to body, just for interference suppression.

Just a thought.

Mrmerlin

the coil wire ground goes from the coil bracket bolt to one of the bolts behind the rear timing cover on both sides this will tie in the ignition system check the other grounds on the right cam tower

Landseer

Interesting. Not seeing it clearly in the wiring diagrams for 84 Euro, but that's ok. Just trying to learn.


Here's the scant, admittedly tangential, reference I had to the function of the wires for the 32V cars....

I'm going to try to start the 85 USA later today without the coil straps.

Drewster67

Shows the ground attached to the bracket mount then over to the head.

Landseer

Very good picture! Interesting.

Drewster67

The only difference with the other side is that the ground wire is a bit longer (connects the same way)

Landseer

Does your 85 Euro have a ground on a very visible bolt just behind the passenger side cam cover like our 84 Euro:

Tampa 928s

No it does not!

Drewster67

+1

pjg

I got both coils grounded to to cam cover.

Tampa 928s

There are two grounds on the passenger side valve covers, one for each bank of injectors; if I remember correctly. There is a place to attach a bolt on the drivers side so I am going to run some grounds.
I can't seem to get rid of a miss maybe this will help!

pjg

Have you checked for vacuum leaks ? It should be in the low 20's at idle, I had a major leak from the brake booster that was causing rough idle and engine miss. Vacuum measured around 15 at idle before I replaced the brake booster.

Tampa 928s

I have a smoke machine no leaks at all, everything is new I mean everything.

Landseer

Cam cover grounds are for all engine electronics and sensors including computers. They don't really split banks.

I've done same due to intermittent miss last week but haven't tried it yet.

http://forums.pelicanparts.com/porsc...-16v-euro.html