Diagnostic challenge

[Jomider]

I have a much loved S4 04 plate V8. 178,000.

It has had a slight delay on turning the key before cranking esp when cold. This has turned into sometimes doesn't crank at all, but then does if you wait 2-3 minutes..

Audi plugged it in for £90 and said .. Computer says no.. No fault, so we can't fix it. I asked why they couldn't deduce from the symptoms, which apparently they could not..

Anyone any ideas please. I'm thinking a sticky relay somewhere..

J

[Trev450]

More than likely to be the ignition switch.

[cuprabob]

I would agree with the above, faulty ignition switch.

[Jomider]

Thanks guys for coming back so quickly. I'll chase that down... Have to get that fixed if I'm going to sell it.

Let you know

All the best.

[Jomider]

Thanks guys for coming back so quickly. I'll chase that down... Have to get that fixed if I'm going to sell it.

Let you know

All the best.

[Jomider]

Just reading up on it, met sounds as though I should not be hearing the master relay clicking, which I am. Do you think it could still be the switch?

[jith]

Jomider said:

Just reading up on it, met sounds as though I should not be hearing the master relay clicking, which I am. Do you think it could still be the switch?

It's more likely to be the starter solenoid; you would here that click if the motor itself doesn't turn. Big job even checking it on the S4, so hard to get in at anything on the engine.

J

[tumble dryer]

How old is your battery?

[Jomider]

Battery is less than a year in fact. I got a big old Bosch one, so it shouldn't be that. Audi tested it as well..

[Rich_W]

Sticky starter motor.

[DanSkoda]

There's a relay that does like to play up on them for the starter motor, but as previously said, it's more likely to be the actual starter itself unfortunately.