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[shaun wilson]

This has me stumped.

My meg 2.6 v6 cd has developed what I think is an unusual starting problem. With between a full tank and a quarter tank she starts and runs smooth as normal. When shes on the quarter tank or less she struggles to start, sometimes taking a good couple minutes to fire up but when she does eventually start she runs as normal, smooth and with instant throttle response.

Also, she only struggles to fire up on the quarter tank if shes sat for an hour or 2 but if shes running and I shut her off then turn the key she starts as normal.

Ive replaced the fuel filter and also checked the fuel pump that seems to be working as normal.

Any ideas.

Thanks in advance. 

[Johnny English]

If pump and filter are right only one thing left to check it is tank vent valve possibly does not open when should do. Try to start with opened tank cap if right than tank vent valve is source of trouble.

Good luck mate !

Laszlo

[Nick W]

A weak or otherwise failing pump seems most likely to me.

[shaun wilson]

cheers for info, will try with cap open and if no luck then will go for new pump. Any idea on the cost of a new pump. 

[zirk]

Any fault codes? (peddle trick). Estate?

[05omegav6]

Pattern ones cheap enough, but might not last too long... 3 years/120k from my last pattern one...

If an estate, they can get very fussy with low fuel levels

[shaun wilson]

No fault codes, shes a saloon model.  Where do I get the pattern fuel from buddy.

[05omegav6]

Local motor factors best bet, but ring VX for a price first

They sometimes surprise with things that you expect to be expensive actually being quite reasonable  (and vice versa )

[symes]

Pattern ones cheap enough, but might not last too long... 3 years/120k from my last pattern one...

If an estate, they can get very fussy with low fuel levels

only when on slope were fuel cannot reach pump and then that is very low on fuel not1/4 tank

[05omegav6]

You say that mine has previously cut out whilst stopped on a bit of left camber, no light on, and about 60 miles on the range

Shoved it round the corner on the starter motor to a level patch and it fired up first time

But usually only happens in the red zone of the gauge

[shaun wilson]

Ok, little bit weird, sunday evening seen her start first turn of the key so not wanting to push my luck I headed to the garage and put her up to the half tank. Ended up having to take a run to the shops so by the time I got home it was back to the 1/4 mark. Monday morning she started first turn so drove to work which took her to just below the 1/4. On leaving work expecting her to turn over a good few times she ended up starting first turn of the key. So took her the long way home and managed to get the gauge on the red. left her all night and she started perfectly again in the morning. Just wondering if me changing the fuel filter and cleaning and fiddling with the pump has maybe disturbed the culprit.

[symes]

Ok, little bit weird, sunday evening seen her start first turn of the key so not wanting to push my luck I headed to the garage and put her up to the half tank. Ended up having to take a run to the shops so by the time I got home it was back to the 1/4 mark. Monday morning she started first turn so drove to work which took her to just below the 1/4. On leaving work expecting her to turn over a good few times she ended up starting first turn of the key. So took her the long way home and managed to get the gauge on the red. left her all night and she started perfectly again in the morning. Just wondering if me changing the fuel filter and cleaning and fiddling with the pump has maybe disturbed the culprit.

[Vamps]

Ok, little bit weird, sunday evening seen her start first turn of the key so not wanting to push my luck I headed to the garage and put her up to the half tank. Ended up having to take a run to the shops so by the time I got home it was back to the 1/4 mark. Monday morning she started first turn so drove to work which took her to just below the 1/4. On leaving work expecting her to turn over a good few times she ended up starting first turn of the key. So took her the long way home and managed to get the gauge on the red. left her all night and she started perfectly again in the morning. Just wondering if me changing the fuel filter and cleaning and fiddling with the pump has maybe disturbed the culprit.

Sounds like it, fingers crossed.......

[shaun wilson]

So far all is good, ive also got her booked in for new timing kit which will put my mind at rest as shes on 81k. Think I need to take out the police lights before I get in trouble though as I have a habit of scaring the life out of the local boy racers 

[shaun wilson]

Right, on my way home from work and while on a single track road I pulled over to let an oncoming car passed, while I was in the passing place the car instantly just cut out. the fuel was sitting just at the top of the red and after turning her over a good few times she started and run as normal.


Any ideas guys.

Cheers

Shaun

[albitz]

Sounds like crank sensor to me.

[VXL V6]

Sounds like crank sensor to me.

Agreed

[TheBoy]

I was thinking same, but the engine ECU never gets to see fuel gauge, so not sure how that could correlate to it only happening on low fuel...

[Gaffers]

either coincidence or a fuel filter issue that is now a crank sensor problem.

[shaun wilson]

How easy and how much to replace a crank sensor. Im also away to replace fuel pump with a brand new 1. Thanks for info.

[05omegav6]

Right, on my way home from work and while on a single track road I pulled over to let an oncoming car passed, while I was in the passing place the car instantly just cut out. the fuel was sitting just at the top of the red and after turning her over a good few times she started and run as normal.


Any ideas guys.

Cheers

Shaun

Fill it up. Then every time you use 1/4 tank, top it up

Might also prolong the life of the pump...

[Andy B]

...

Fill it up. ......

Might also prolong the life of the pump...

It doesn't do your wallet much good though.
I filled up the Omega yesterday on my way home from work .... £88 and same again tonight in the Merc £100.01 

[TheBoy]

Right, on my way home from work and while on a single track road I pulled over to let an oncoming car passed, while I was in the passing place the car instantly just cut out. the fuel was sitting just at the top of the red and after turning her over a good few times she started and run as normal.


Any ideas guys.

Cheers

Shaun

Fill it up. Then every time you use 1/4 tank, top it up

Might also prolong the life of the pump...

No petrol car should ever be filled up until the misfires start

Hence, I frequently used to walk down the road with a plastic can in my hand

[shaun wilson]

Crank Shaft Sensor, just done the pedal thingy and code 0335 flashed, that's the only code that came up aswell. How much to fix and where is the best place to get a new sensor.

[05omegav6]

Right, on my way home from work and while on a single track road I pulled over to let an oncoming car passed, while I was in the passing place the car instantly just cut out. the fuel was sitting just at the top of the red and after turning her over a good few times she started and run as normal.


Any ideas guys.

Cheers

Shaun

Fill it up. Then every time you use 1/4 tank, top it up

Might also prolong the life of the pump...

No petrol car should ever be filled up until the misfires start

Hence, I frequently used to walk down the road with a plastic can in my hand

Done that more often than I should have myself

Pretty certain that constantly trying to start it on fumes was what killed the first crank sensor and then the fuel pump

Besides 21-22 litres of fuel still costs £30 regardless of which end of the tank it goes in

[albitz]

Crank sensor - ballpark figure £60. Genuine GM only. Follow the guide in maintenance section when fitting the new one.

[05omegav6]

Crank Shaft Sensor, just done the pedal thingy and code 0335 flashed, that's the only code that came up aswell. How much to fix and where is the best place to get a new sensor.

Vauxhall only if you want it to last. But isn't that the one code that doesn't mean what it says

[shaun wilson]

New sensor on its way, hopefully once I follow the guide and get it fitted then issues should be resolved. Fingers crossed. Can somebody point me in the direction of the fitting guide. 

[RobG]

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

[Entwood]

New sensor on its way, hopefully once I follow the guide and get it fitted then issues should be resolved. Fingers crossed. Can somebody point me in the direction of the fitting guide. 

Start here ..

http://www.omegaowners.com/forum/index.php?topic=90633.0

end up here ..

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

[shaun wilson]

Evening,  got home from work to find my new crank shaft sensor awaiting. Gets the trusty tool kit out, locates the sensor on the car, matched the part numbers up and all good, takes the sensor out to find the tiniest bit of rusty fragment stuck to the end of the sensor, the piece must have measured about 1mm by 1mm    so removed it, cleaned up the sensor put it back in and hey presto. She is running like a new car, idles like a purring kitten, starts instantly on turn of the key.

Now my understanding of the sensor is its just a magnet, so im now in the belief that this tiny fragment of metal stuck to the tip of the sensor has been giving false readings and causing my headache. Any info would be appreciated.