Dodgy Starting Mk2

[Golf Loon]

Right today the friendly exhaust place put a new fitting for the o2 sensor under the car before the cat.

I spliced the 2 whites together, the black to the black and earthed the grey.

Now the car runs **** when cold and ok when its warm. WTF

The black wire where it comes from the car loom has a metal sheath which some genius has earthed to the engine, is this right??

The only thing I can think of is that the white wires need to go onto the opposite wires, or maybe I need a Mk2 sensor.

Any ideas??

[aussieg60]

What do you mean when you spliced the 2 whites together ?

[aussieg60]

I suppose you meant the 2 whites from the loom to the 2 whites on the 02.

[aussieg60]

Ok, I just checked my old engines loom and 02 sensor as its original. If this helps, its like this. From the loom there are 3 wires and a shield.

1. Red/White ----> white 02
2. Black ----> other white on 02
3. Brown/Black ----> black on 02
4. Shield/black insulated ----> should go to a ground on the head cover.

[Golf Loon]

Thanks aussieg60

Now when you say the shield goes to ground on the cover, is this a separate connector?

Yeah I mean I spliced white to white, but does it matter to which one??

[h100vw]

If you have 3 wires but one of them has a shield around it, then treat it as being 4 wires Matt. The shield must be earthed to give the ECU something to reference the signal to.

The whites can be connected either way.

Gavin

[aussieg60]

Yes, the shielded wire was not part of the 3 pin connector comming from the loom. It had a loop crimp which earthed somewhere, I think on the head cover.

[Golf Loon]

Well I have it wired exactly like that and the car still starts badly and hunts up and down. Runs OK, when warm, but still smells a bit fuelly.

I reckon either I have another duff sensor, or its something else.

Any ideas chaps?

[aussieg60]

All I can say is when I hold the WOT (full throttle) switch on the G60, the idle hunts up and down. Maybe you have a stuffed idle or full throttle switch ? Gavs the expert

[static1800]

my car hunts up and down when i first start it for a bit, after that its fine.

[syncro]

Check the adjustment of the full throttle/idle microswitch. This causes these sort of problems.

[Golf Loon]

Yeah thanks guys.

I drove it today and it hunts up and down when you first start it, hot or cold and then is fine when its running.

Feels a bit underpowered, but that could be the Aussie Mk2 syndrome.

When you go to start it, it cranks over weakly for upto 20 seconds sometimes without starting, almost like it is starving of fuel.

I`m gonna check the microswitch next, any other suggestions guys??

[h100vw]

Crappy starter motor or bad connections/earth. A bad earth between the engine and battery won't help matters in the running department either.

Gavin

[aussieg60]

Did you sort out the Vac lines ? Heres a pic of my old motor and an ETKA dump with the Vac lines (T piece posi 9). I had a look in my Bentley manual, kind of points to fuel pressure checking or air flow sensor. Can you still smell fuel ?

[Golf Loon]

Thanks Voy thats a very helpful pic.
The vac lines are not routed that way, I`ll sort em out and report back.