Earth Points

[benough]

Yo.

My MK2 has a new ISV and MAF and now idles like it should!

That said sometimes it still misbehaves and you can set it right by running the air conditioning.

I just thought it was the added load on the engine that did it but a friend suggested it may have a dodgy earth.

If so where do I check the earth points?

I know there are the wires which connect to the rocker cover but are there any others?

Anyone else had this issue?

Cheers

[tommymac]

yer ben

There will be an earth that runs to the block, head and possibley gear box ( i have on mine but not sure if that was stock) there is also a main fuse box earth and other assiocated earths all crimped togther going into the earth terminal i assume.

[Golf Loon]

Also one up in the raintray to earth the ecu. That one is important and can be redone to good effect.

[joshyd-mk2gti]

i've been meaning to redo some of my earths. what gauge cable should i use?

the MFA oil temp reading jumps around when the electrics are switched on and off, thinking it's the ecu or fuse box earth.

edit: just found this

[benough]

Cheers for the diagram!

Yeah I must admit the headunit sometimes just turns off and the tacho will bouce up high when you turn the car on or off.

[benough]

So I got laughed at when I asked for the earth points to be checked my Auto Electrician. Not sure if I will go back.

Anyway it now idles worse. The old italian bloke said he "adjusted it a little bit"

Does anyone know if the ECU sends a higher idle signal to the motor when the A/C is on to account for the extra load?