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[hoj]

Mate has a 2.5 V reg Auto it runs fine WHEN it starts
It's had new leads plugs diss pack and battery but on the turn of the key it takes ages to fire up all it seems to do is pop and f@&£ and emit "explosions" from the exhaust then at no set time it will fire up and run
He thinks it's definitely a fuel problem but how do you control the amount of fuel the engine is getting

[Nick W]

You don't control or adjust it, the ECU does.


If it's popping and exploding in the exhaust, then it's getting fuel. Ignition faults are always the place to start with this sort of problem(most carburettor faults are electrical ), once the basic mechanical checks have been done. Those are even more important if it has had work recently - cam belt for instance, which is really easy to screw up.

[henryd]

are the leads on in correct order

[hoj]

Forgot to say when it does start eventually it runs perfect and will start first turn of the key throughout the day

[Doctor Gollum]

Fuel pressure regulator on its way out, an easy £10 fix.

Injector cleaner and Shell V Power wouldn't go amiss either.

[hoj]

Thanks ALL

[hoj]

Does the FPR cost around £10 Doctor or is it as you say around £10 for a “fix”

[Doctor Gollum]

The FPR is available from about £12 and takes a whole ten minutes to fit.

The rest of it will set you back about £7 for the injector cleaner and £190 in Shell V Power.

Not that I needed to tell you any of that

That's to say it's quicker to type "Vauxhall omega fuel pressure regulator" into ebay, which is all I did  , than it is to ask the question here, and I presume that you know how much two tanks of decent fuel cost

[deviator]

That's to say it's quicker to type "Vauxhall omega fuel pressure regulator" into ebay, which is all I did  , than it is to ask the question here, and I presume that you know how much two tanks of decent fuel cost

Isn't the 2.5 Omega FPR 3.5Bar and the 2.6/3.2 a 3.8Bar FPR? (I don't know about the 3.0).

It is written on it.

[Doctor Gollum]

iirc, all are 3.5 Bar.

No longer have a fuel rail to check...

[deviator]

iirc, all are 3.5 Bar.

No longer have a fuel rail to check...

How sure are you? A quick eBay for Omega fuel pressure regulator brings back... 3.0Bar, 3.5, 3.8, 4.0 and 4.5.

[Doctor Gollum]

Pretty confident although, you may be correct re the 2.6/3.2

[Diamond Black Geezer]

Mine is still doing similar issues to what you say. Once started, even if run for only two seconds, you shut down, then start her up again, she fires instantly - leading me to think fueling, possibly fuel pressure being lost somewhere. I have a FPR which I'll be trying at some point too, though.

Start with the cheapest or free repairs first, that's my motto, and work up. (not that my advice is worth much lately  )
 

[Nick W]

Mine is still doing similar issues to what you say. Once started, even if run for only two seconds, you shut down, then start her up again, she fires instantly - leading me to think fueling, possibly fuel pressure being lost somewhere. I have a FPR which I'll be trying at some point too, though.

Start with the cheapest or free repairs first, that's my motto, and work up. (not that my advice is worth much lately  )

regulators are so simple(a piston and a spring) and reliable that a new one is unlikely to change anything.
Fuel pump, wiring(include the CPS, cam sensor and MAF) and the pickup in the tank are the parts I would be looking at.


But only AFTER measuring the fuel pressure.

[Diamond Black Geezer]

Mine is still doing similar issues to what you say. Once started, even if run for only two seconds, you shut down, then start her up again, she fires instantly - leading me to think fueling, possibly fuel pressure being lost somewhere. I have a FPR which I'll be trying at some point too, though.

Start with the cheapest or free repairs first, that's my motto, and work up. (not that my advice is worth much lately  )

regulators are so simple(a piston and a spring) and reliable that a new one is unlikely to change anything.
Fuel pump, wiring(include the CPS, cam sensor and MAF) and the pickup in the tank are the parts I would be looking at.


But only AFTER measuring the fuel pressure.

this