Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Sp4rkst4rt3r on 27 June 2014, 09:00:21
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Hello again peeps,
This time I have an issue with Fuel Pressure!
When the car is left for +2-3 hours it takes several attempts to start the car.
It fires every time on the key, the revs rise to about 1200rpm (momentarily) retuning to it's normal 750rpm (ish) then it coughs & splutters to a stop!
After several attempts it starts and runs sweet but if I press the accelerator it coughs & splutters a few times (30-60 secs) then clears and settles to a crisp even tick-over.
I can start the car first time, every time, but if I leave it for a few hours it's the same rigmarole all over again!
I can't take her for a run to clear the cob-webs because she hasn't got a current MOT (YET) ;D
I have fitted a new fuel filter (pain in the arse estate >:( ) now I am wondering if the fuel pump is faulty?
I have a spare here that I can fit but I would like to drain the tank prior to fitting it.
Does anyone know which are the Live & Ground connections at the fuel pump connector?
Also is there a fool-proof way to find/locate any air bleeding into the fuel system?
Regards...Dave
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Petrol or diesel?
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Oooops forgot that bit :P
Petrol ;) :D
Cheers Taxi Al
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Possibly cam sensor related :-\
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Get codes read but warm starting issues are usually cam sensor. Its about only sensor engine wise to cause issues on 2.2 :y
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Car starts fine when warm.
As I said in first post, from cold it fires 1st time and every time after that but it sounds like it runs out of fuel and stalls several times (4-5 times) then runs fine.
It definitely sounds like a fuel starvation issue.
I would love to take it for a run to get a feel of what is happening under load but not until it has an MOT.
No codes stored and I can't replicate issue until it's been sat for a few hours :'(
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Might be a failing pump then... if you have a spare then fit that and go from there :y
No need to drain the tank, just don't smoke anywhere near it :y
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Also worth checking Vac pipes and any tears or cracks in the Airbox inlet pipes to the throttle body.
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@ Taxi Al,
I have removed the fuel pump from my car and there is a bit of dirt on the base of the plate/cup where the pump locates.
I have a 3/4 full fuel tank and would like to clean out the bit of dirt.
How can I do that with all this fuel in the tank?
I nearly shit myself :o when I removed the top plate. I didn't expect to be able to put my arm into the fuel tank ???
Glad I took your advice and didn't smoke whilst doing this job :y :y :y
Very good safety tip there m8y ;D ;D ;D
@ Zirk,
I'll check the vacuum pipes and associated connections once I have this fuel-pump fitted.
I have to stop now, gotta get off to work so will continue in the morning.
I should have some help tomorrow so once I get it running I will be able to observe the engine bay as it's being revved.
Thanks all for your suggestions so far, if anyone has any more suggestions please feel free to let me know :D
Regards....Dave
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@ Taxi Al,
I have removed the fuel pump from my car and there is a bit of dirt on the base of the plate/cup where the pump locates.
I have a 3/4 full fuel tank and would like to clean out the bit of dirt.
How can I do that with all this fuel in the tank?
I nearly shit myself :o when I removed the top plate. I didn't expect to be able to put my arm into the fuel tank ???
Glad I took your advice and didn't smoke whilst doing this job :y :y :y
Very good safety tip there m8y ;D ;D ;D
@ Zirk,
I'll check the vacuum pipes and associated connections once I have this fuel-pump fitted.
I have to stop now, gotta get off to work so will continue in the morning.
I should have some help tomorrow so once I get it running I will be able to observe the engine bay as it's being revved.
Thanks all for your suggestions so far, if anyone has any more suggestions please feel free to let me know :D
Regards....Dave
If you're leaving it, refit the plate and seal :y
Re the crud in the tank you can never remove all of it so don't bother... Pump has a filter and anything else gets stopped by the fuel filter :y
Re the filter was it fitted the right way round? Shouldn't matter but they're technically direction specific
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@ Taxi Al,
If you mean the fuel filter (Under car between fuel tank and differential) then yes it was fitted correctly :y
The only other filter is the one connected to the fuel pump itself and I haven't removed it yet.
However when I removed the fuel pump and looked at the filet it did have a bit of crap in it.
If this can be removed (not had a good look at it yet) I will check the donor fuel pump for any crap tomorrow ;)
I re-fitted the top plate and popped the flow/return pipes back on it until the morning.
The actual fuel pump I popped it into a plastic bag with a load of paper towels in the bottom and sealed it with a tie-wrap 8)
Been back in garage and opened boot and I can't smell petrol so all good this end........so far :P
Ta for the help today, i'll be back tomorrow to update you guys when swap over is done :)
Regards....Dave
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If you're carefull you can pop that plastic filter apart, but any significant debris inside it will have come from the pump itself :-\
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Is there a test I can do to check the pump is delivering the correct amount/pressure of fuel prior to installing it (i.e. Flow rate)?
Regards.....Dave
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So I fitted the replacement fuel pump and there is no difference!
I came to start the car this morning and it did exactly the same as before!
It's as if the fuel injection manifold is losing pressure over a period of time (2-3 hours).
I have checked for fault codes and there aren't any stored.
I am now completely baffled by this and need some more suggestions.
Is there anyone near me (NW Wigan) with a proper Vauxhall code reader and knows a little about these cars?
I would appreciate any help offered.
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Ok, next step is to replace the valve on the fuel rail...
Looks like this... http://www.carpartsdiscount.com/auto/archive/pictures/345167/1000/1/P/CE8CFC/fuel_injection_pressure_regulator_oem_9404583.jpg
And is held in place by a clamping ring :y it will have the pressure on it, probably 3.0 bar, replace like for like :y
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I have got a spare from another engine and when fitted it's just the same.
Is there nyone near my location who could help me out with this?
Would it be better to start a fresh thread asking for 'Hands On' local help?
Regards...Dave
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Depending on where you are int North west... Daz, aka Darthlooknee is in Stoke, and ElitePete/Jimbob are in Chester... :y
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Sorry thought I had already said I am in Wigan :'(
Stoke and Chester a little far to go without an MOT or Road Tax ::)
I'll look for someone near me on't'interweb :-\
Regards....Dave
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So for clarity, you have changed the fuel pump and the pressure regulator, both from another car, which presumably ran with no issues...
Next step then is the cam sensor :y
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Get codes read but warm starting issues are usually cam sensor. Its about only sensor engine wise to cause issues on 2.2 :y
::) ::) ::)
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I had already swapped the cam sensor off the spare engine but to no avail.
This doesn't mean it was any better of worse condition than the one I removed!
Next to having a limitless supply of OEM sensors etc. this is proving to be very difficult.
I have located a garage in Wigan that have a real Tech2 tester and it's booked in for 8:30 am tomorrow.
Shame there wasn't anyone nearer, I could have put a few beer tokens in a members pocket.
Hope it doesn't cost me a fortune, really can't afford it, wish me luck :y
Thanks for your time and suggestions, I'll be back to let you know the score :)
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Ok, have you changed the Fuel Rail Pressure valve?
From your last post, it would seem not... :-\
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Hi Al,
Yes I have changed the Fuel PRV and tested them both by running the engine and disconnecting the vacuum pipe then waited for 2 minutes to see if any fuel came out.
None came out so I guess this proved it wasn't leaking but the ultimate test would be testing the fuel rail pressure wich I am hoping my man tomorrow can check for me.
Regards.....Dave
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Ah, ok :y if anything swapped off the problem engine doesn't replicate the fault on the other one, then you can eliminate things pretty decisively :y