newworld

I am more confused then ever now as I fear the po did something to harness...

What I need to low is how many eyelets total are grounded near throttle pulley valley. So far I know of 2 which I think are fuel injectors ground at location viii or drivers side...I want to know on ix ground point how many eyelets should be there?

MainePorsche

There are a total of seven attachments to MP IX.
Mongo states three are on one eyelet.
As I stated earlier there are two or three per Masse Punkt. It could be variable. The surest way to know whether you have free grounds unattached is to get under the manifold. As you have stated in another thread you have significant troubles starting and/or idling, you may want to do a top end refresh as part of this workup and servicing.

Landseer

I don't remember.

Count the brown wires.

Mongo

I apologize.

To correct what I said:

Ground point MP IX, under the passenger fuel pressure regulator grounds the EZK, MAF, and TPS. Cleaning this will help.

Ground point MP VIII, under the driver side fuel damper grounds the LH, and oxygen sensor.

You need to take both the damper and regulator off to see these two eyelet (or ring terminal) connectors. There is one thick ground wire for each terminal. If there aren't grounds connected under the regulators, your PO may have them relocated. The only reason I can think of for this aside from idiocy and a possible amphetamine addiction would be that the mounting points for these grounds are stripped, or the threads are gone.

Please remove the damper and regulator at the back of the engine and take a picture for us so we can see what you're talking about. Be careful when working with the fuel lines and disconnect your battery! Make sure you tighten the lines up good when you reassemble but don't over-tighten them.

Mongo

Found my old pictures!

EZK ground on the passenger side. The light is being shined back on the mounting point. The passenger side should be opposite of this next to the cable linkage cam (round plastic disc).



Here is one of the grounds I found loose and cleaned with DE-OXIT.















Here is the link to my exorcism thread:

https://rennlist.com/forums/928-foru...ml#post7613169

syoo8

Here are two different views (from a previous thread) if it helps.

newworld

I had the whole harness off when engine was removed and intake refresh....based on pics I see above my harness simply does not have grounds for lh o2 maf etc and that may be my problem.....as I mentioned I only had 2 eyelets to ground. That's it.

My harness is wrapped in electrical tape by po.

I think something happened back there....but now I have an issue....assuming I don't have grounds for maf o2 lh etc....then how to remedy situation.....do I splice into these wires and ground them?

That's my bigger problem....it is possible this po had some sort of issue I.e. minor fire back here as I see slight scoring on bottom of air box. At that time maybe the ground wires at ix got roasted....then he taped harness p and didn't ground at ix

dlagerstrom

You mentioned in your original post that you have an 82. It should be L Jet, not LH. That may be some of the problem. I have my 82 apart now so maybe I can dig in there if needed.

newworld

87s4 aut.

i have 2 small eyelets which i assume are for fuel injection grounds. grounds for harness are not there.

Mongo

Fuel Injector grounds are part of the LH ground on the driver side rear part of the motor.

newworld

mongo then how does maf, o2, etc get grounded?

Mongo

Yes. They are part of the ground wire I indicated in post #19. They are part of the MP IX one. Remember, all the grounds are on a single ring terminal.

newworld

mongo that helps,

my 2 eyelets are grounded at MPviii and nothing on MPiX....

i wonder if that should matter or not....

Mongo

It matters a lot. See if you can locate where the other ground is. Due to the length of the wiring harness, it must be close by. Any other area that ground is screwed into may not be suitable enough for negative conductivity. Look around for anything that would seem out of the ordinary based on that wiring diagram and pic of grounds linked into this thread. I bet that where the MPVIII ground is located is the cause of your running issues.