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[Bikerdon]

Hi, not been on her much due to health issues, I have a new problem with my 2001 2.6 estate. over the last 3 weeks it occasionally will not start when warm, but if left for an hour or so it seems to start again quite happily. Last week it cut out at the lights while still cold but started again immediately. Tonight however it cut out while warm as I was waiting to pull out at a roundabout, would not restart, this was accompanied with a buzzing noise from behind the dashboard which sounded like a relay switching really fast, in fact I flattened the battery trying to get it going. I moved it to the side of the road and walked the last mile home, had a cuppa, borrowed the neighbours booster pack and walked back to the car, connected the booster and it fired up immediately, there was a short burst of buzzing from the dash again which went away after a few seconds. Is this possibly the crankshaft sensor on its way out? or could something else be the problem, the fuel pump relay maybe? Any advice would be appreciated. Thanks.

[Enceladus]

This sounds like a failed crankshaft sensor. Not sure what the noise means. Have you checked for stored fault codes?

[Bikerdon]

I did suspect the crank sensor too, but was not so sure because of the intermittent nature of the problem, I was assuming a crank sensor would just fail completely rather than be susceptible to heat, I had just completed a 25 mile drive home from work when this happened today, also had done the same distance to work this morning with no issues. Have not had the chance to check codes yet.

[Entwood]

IIRC its heat that kills the crankshaft sensor in its "original" position, which is why the guide suggests a re-routing of the cable ... so the intermittent nature of your problem "might" be heat starting to cause what will become a total failure .... only true, of course, if the crankshaft sensor is original and not changed ..... 


http://www.omegaowners.com/forum/index.php?topic=90540.0

but I fail to see how a crankshaft sensor failure could cause "buzzing" from the dashboard ....   

[Bikerdon]

Sensor is the original from what I know about the cars history, no record of it ever being changed. The buzzing is a new thing, only happened today when trying to restart after it cut out at the roundabout, and again briefly once the car had started, I couldn't pinpoint exactly where behind the dash it was coming from though. Must have a look at the re-routing guide.

[Broomies Mate]

Just a hope and prayer..... Heavy keys in the Ignition switch? Or going over speed bumps?

Not a common thing on the Omega, but quite common on other Vauxhalls.... cause a short and stall the vehicle (or even worse, wont allow it to switch off).

[BazaJT]

When crank sensor failed on mine it displayed the same symptoms apart from the buzzing.It would start from cold but as it got warmer would stall on tickover and trying to start it sounded as though it had a flat battery.Leave it a while to cool a bit and it would start fine again,eventually it stalled and simply wouldn't restart because sensor had failed totally.

[grifter]

I had same issue with my 26, thought it was crank sensor but turned out to be multiplug under air intake bellows, the clip had broken off while doing timing belt last year, i pushed it home and it never caused problem, until now. Just tie wrapped it tight for now so it is right home.

[terry paget]

You report classic crank sensor failure symptons.

[Migv6 le Frog Fan]

This. ^

[Bikerdon]

Well, I have just finished installing a new genuine Bosch crank sensor, (that was fun!), nothing visually wrong with the old one, cable looked ok too but heat insulation was crushed and split so it could be that heat is the culprit, I followed the guide on here and routed the new cable away from the exhaust as recommended. So, I will just have to drive it about and see what happens. I did notice that the idle seems smoother now so hopefully that is a good sign. I think the intermittent buzzing behind the dash is probably an unrelated issue which I will investigate next. Will report back soon, and thank you to everyone for the advice.

[tigers_gonads]

Before you put your hand in your pocket for a new sensor, when it stalls do you or have you just had your foot on the brake peddle ?
Do the revs hunt up and down first before it stalls ?





Just read your post above ............
Edit to say, fingers crossed 

[Bikerdon]

When it has stalled it does tend to be at the lights or waiting at a junction, then would not restart, so yes, I would have been braking or had my foot on the brake pedal, there was no hunting up and down at any time though. The main issue was it randomly not starting when warm. I'm very interested to know why you ask about the foot on the brake pedal and the hunting.

[Nick W]

Does the problem alter if you disconnect the MAF?