1.0 Not running, water in fuel?

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piglet14
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1.0 Not running, water in fuel?

Post by piglet14 »

Just what I need, Arosa has sat for a couple of weeks or so out in the weather, then wouldn't go.
The whole engine bay seemed really wet so I stripped out the HT set & plugs, dried everything in a warm place, sprayed it up and it did finally go but then a mile down the road splutters coughs and dies in the middle of a roundabout.
While towing it home I did have it running but it died again.

I realise this could be many things but given the circumstances I'm clutching at the contaminated fuel straw.
Without a primer bulb how can I purge fuel up to the engine? Is there a pump in the tank?

Also are BUR6ET plugs right for the 1.0?

Thanks in advance.
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alexperkins
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Re: 1.0 Not running, water in fuel?

Post by alexperkins »

There's an intank fuel pump

As for the sparks, yes they are correct
piglet14
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Re: 1.0 Not running, water in fuel?

Post by piglet14 »

Thanks Alex, plugs ordered.
Pulled supply off fuel manifold and filled a Coke bottle by flicking the key on & off.
Fuel looks fine and comes through quick enough.
Puff of ES and it started onto tickover and idled until warm.
However when up to temp it was missing a bit and when I sat blipping the throttle it was missing badly on pick up but would rev, I didn't try and drive it.
Parked it nose down, then nose up, same.
Is this going to be a plug'n'play job?
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alexperkins
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Re: 1.0 Not running, water in fuel?

Post by alexperkins »

I'd say it needs proper diagnostics

There might be a problem with the green temperature sensor too. There's a number of other sensors that can also cause this behaviour
piglet14
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Re: 1.0 Not running, water in fuel?

Post by piglet14 »

It's due plugs & leads anyway. I could do that first as a matter of course. But I can see me limping it round to the garage.
Do these look right?
http://www.ebay.co.uk/itm/351473545586
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alexperkins
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Re: 1.0 Not running, water in fuel?

Post by alexperkins »

Without checking the part number they look ok at a glance
piglet14
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Re: 1.0 Not running, water in fuel?

Post by piglet14 »

Just a thought,
The tank pump runs for a couple of seconds on switch on, I can hear it.
Does it then run on demand when the engine is running?
Can't say I've noticed it.

When the engine conks it seems to start again after a few runs of the pump. Fuel pressure?

I'm trying to find a 'good' mechanic. Everyone I've used round here I've been disappointed with hence I end up doing it myself!
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alexperkins
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Re: 1.0 Not running, water in fuel?

Post by alexperkins »

When you turn the key it primes the fuel lines. When it's running the pump runs constantly and adjusts the flow depending on the demand

Checked for any vacuum leaks?
piglet14
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Re: 1.0 Not running, water in fuel?

Post by piglet14 »

No I havent.
There are 2 thin tubes that push into the underside of the airbox.
Don't know what either of them do but the one that runs to the front is split where it pushes onto whatever it is.
The one that runs back sucks like a dentists vacuum when pulled off the airbox, however it doesn't seem to make any difference to idle when reconnected, maybe drops RPM slightly.

Re. the tank pump, with the engine running I should be able to hear the pump running if I lift the rear seat then?
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Re: 1.0 Not running, water in fuel?

Post by alexperkins »

One is crankcase pressure equaliser (the sucking one) the other is the breather for the crankcase

Yes you will
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Re: 1.0 Not running, water in fuel?

Post by piglet14 »

Well, the pump makes a fairly distinctive sound pre-start, then is silent once the engines running.
However F32 goes live with pump and is live when it's running so I have to assume the pump is energized even if it don't sound like it.

I got brave and limped it to the nearest petrol station, squeezed in 7l of BP 97oct.
Drove home the long way and it seemed a bit more settled.

Lead set ordered.
piglet14
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Re: 1.0 Not running, water in fuel?

Post by piglet14 »

Update,
Drove to work, fine to start but as it reached temperature steadily got worse.
Idles fine and is mostly OK driving at steady speed, it's as soon as I accelerate it stumbles & misses something rotten.

Both small breather pipes now split and I can't find them anywhere, or a parts diag.
piglet14
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Re: 1.0 Not running, water in fuel?

Post by piglet14 »

Further update:
A colleague insisted on cleaning the throttle body for me, I thought he was wasting his time but out of politeness I let him get on with it.
I had to eat my words as it 100% cured the misfiring problem.
But now it's idling like a F1 car. 2000RPM when rolling, dropping to 1500 when stopped. (interesting)
Slightly improved by fixing the vac tube that T's off the servo pipe and plugs onto the underside of the airbox. Now 1100.
I tried sucking on the tube with the engine running and it made no difference. Obviously not sucking hard enough.

Said colleague reckons it needs to re-learn throttle positions after the clean up and will settle down in time.
That all sounds like science fiction to me, but he's proved me wrong once already. :oops:
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Re: 1.0 Not running, water in fuel?

Post by 937carrera »

Your colleague is correct...... the throttle body needs to be re-adapted through VAGcom / VCDS (this means re-learning the throttle valve position for the fly by wire system).
piglet14
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Re: 1.0 Not running, water in fuel?

Post by piglet14 »

Thanks Carrera,
So it's not going to fix itself then.
If it's got to be plugged in anyway, should I at this stage be removing the throttle body/EGR etc. and giving them a bench clean?
Oh, popped into main dealers, those vac tubes are 20 quid Ea + VAT.
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