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Discussion Starter · #1 ·
Morning All,
Just wondering if anyone can throw any suggestions where to look next?
I've had an issue with car losing power on acceleration and having spoken briefly to the vauxhall tech, he's suggested looking at the rail pressure after shutting down the engine.
Basically it's back to 0 PSI after around 30 seconds, is this normal for this engine? I've read online that it should maintain pressure >3000 PSI overnight but not sure if this is true?
A few things I've tried already... new Fuel Rail Pressure Sensor, new Fuel Regulator Valve / SCV, new Fuel filter, Checked & cleaned EGR actuation, cleaned MAF, cleaned MAP sensor.
Interestingly, if I reset learned values of fuel pump and fuel pressure sensor and don't shutdown the car drives like a dream, once shutdown and driven again the acceleration loses power around 3000 RPM.
Any help appreciated. :)
 

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I kept losing pressure on my 1.7 dtj (2010 euro 5)
Turned out to be the pressure relief valve built into the side of the rail.
It had rusted up on inside and stopped the valve seating properly.

At time I couldnt buy the valve separate which screws into the rail (£300 ish if I remember right )
But get a used one and swap the part to yours.
 

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Discussion Starter · #3 ·
I kept losing pressure on my 1.7 dtj (2010 euro 5)
Turned out to be the pressure relief valve built into the side of the rail.
It had rusted up on inside and stopped the valve seating properly.

At time I couldnt buy the valve separate which screws into the rail (£300 ish if I remember right )
But get a used one and swap the part to yours.
Thanks, can you remember if it's easy enough to get to and remove to check?
 

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Screwed into the end of the fuel rail so should be straight in front of you.
Garage found it on mine so let them finish the job.
Can get fuel rails on eBay for £25 ish so I would just try that as you won’t have pressure testing equipment
 
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