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Vauxhall Astra, 2001 1.6 16v. Missing and losing power on corners and acceleration.

Posted By Richard P 4/30/2008 3:09:34 PM
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Vauxhall Astra, 2001 1.6 16v. Missing and losing power on corners and...

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Richard P
 Posted 4/30/2008 3:09:34 PM
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Hi all,

we have a vauxhall astra 1.6 16v that loses power when cornering and on hard acceleration. We have checked all the electrics with no success, however... we have driven the vehicle with the fuel pressure gages connected and there is a notable drop in fuel pressure. At first we thought that the fuel pump armature was probably loading up and slowing down when certain forces are acting upon it.

We changed the pump but alas it's still the same. I have checked the swirl chamber and I believe that the return hose that is connected to the bottom of the swirl chamber may not be returning all the fuel to the chamber. When we connect an air hose and lightly inject air into the hose we not only get bubbles from inside the chamber but also within the tank near the connection to the chamber. 

Has anybody out there seen this fault before?

Thanks

Richard

Chris Venning
 Posted 4/30/2008 3:29:13 PM
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Is this the same setup as Vectra, if so remove the pot that the pump is fitted into, and check for blockage.

I could give up Stella, but I'm no quitter. Beer Drinker 
leetom
 Posted 4/30/2008 3:34:11 PM
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is this the system that has a pressurised return system with the pressure regulator mounted on the return side in the pump assembly.

It could be a weak regulator valve not maintaining enough fuel pressure under hard driving conditions but this wouldn't account for the cornering fault.

Are you sure the pump pick up filter isn't restricted. The return pipe feed straight back into the swirl pot so unless the fuel tank is near empty then i can't see why the swirl pot isn't filling up quick enough.

These cars do have fuel problems when low on fuel even if you park them on a slight slope or on the kerb edge.

Richard P
 Posted 4/30/2008 3:39:30 PM
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Thanks for the relies guys.

The fuel pressure regulator is on the fuel rail. The customer says that the problem is more prevalent when the car is low on fuel. I have tried to remove the swirl pot from the tank to have a look but i can't get it out.

Our local vauxhall dealer says it is part of the tank. But can it be removed?

Richard

Richard P
 Posted 4/30/2008 3:42:05 PM
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Also the pick-up is completely clean. There were particles of sand within the swirl pot but we used a mighty Vac to suck them out.

Richard

topbloke
 Posted 4/30/2008 4:27:04 PM
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if its an astra g then you can but its a pig to get out i will pm you a picture so you can see
leetom
 Posted 4/30/2008 4:48:24 PM
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if this is a Z16XE type engine then it has the pressure regulator on the return pipe in the tank and it can be replaced separate from the pump. Also the pump has a screen filter on the pick up side.

The fuel pressure is a constant 3.8bar no matter what engine load requirements are required and the fuel is returned near fuel filter outlet as it has a loop back to the tank.

You can roughly check the regulator with your compressor airline, slowly increase pressure of your airline and put it on the inlet side of the fuel regulator and keep increasing pressure until the air is forced out through the regulator outlet, then note what pressure your airline is at. (rough but it will give some idea of a weak regulator).

Chris Venning
 Posted 4/30/2008 5:08:41 PM
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The above is a Vectra tank fixing with the canister removed, as TB says: a pig to get out. Look for dirt and debris under the canister.

Lee, Richard's already stated: pressure regulator is on the fuel rail.

I could give up Stella, but I'm no quitter. Beer Drinker 

4/30/2008 5:09:37 PM by Chris Venning
leetom
 Posted 4/30/2008 5:44:01 PM
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Chris,

i read that part about the pressure regulator being on the fuel rail but that doesn't tie in with my vauxhall data so i assume its a 2000 year and an X14XE engine which has a fuel supply and return on the rail and has an operating pressure of 3.0 bar.

Forget all i've said (you probably have anyway) as its not applicable for this model/engine type.




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