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Refusing to start....

[Vivaro]
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#21 ·
The more informed members will know if this is possible....
Can they hydraulically test the pressure with a gauge on the rail, rail pressure sensor disconnected, and force the pump sensor open to provide diesel, then see what leak off there is from injector and rail relief valve,,,, cos this pressure is going some where,, and if you can isolate mechanical from the electrical cause you will be on your way to solving the problem
 
#24 ·
I would have thought you would need a pretty good gauge to record that amount of pressure....not wishing to go over old ground but if the injectorrs are leaking back that could cause it, there is a way to test the pressure with a multimeter on the pressure switch electrically......Fred.
 
Discussion starter · #25 ·
Van still won't start and the fuel system seems to be fine, they having confirmed it with Vauxhall. It is all pointing to the immobiliser and key, but since I don't have a second key I have to go down the route of Vauxhall coding a new remote to the van to test out that theory, more expense!! And to top it off I have to get the van from the garage tonight back to home, then have it recovered to Vauxhall for coding when I get back of holiday next week. So going pete tong with this bloody van haha:mad:
 
#26 ·
If your convinced the fuel system is ok you might want to think about what the immobilizer does on yours, i thought it had something to do with the injectors delivering fuel...i suppose the crank and cam sensors are ok and compression ok, induction and exhaust side of things ok...does it run on easystart...you have prob ben through all this...Fred.
 
#28 ·
Well theory is....
The way to check the fuel pressure if you dont have any special equipment, find the fuel rail pressure switch, there should be 2 wires on it, check one for 5 volts with ignition on, then check the other side of the switch with it cranking or running, make sure the 5 volt wire is on the switch, you can do it with both wires on switch, and check for 1.3 volts cranking and up to 4.5 volts when running, if you get about 0.5 volts you have no fuel pressure. You should get 0.5 volts on that signal wire key on engine off.

Its not an exact science but it tells you if you have pressure or not...Fred.
 
#30 ·
Why not plug opcom in and it will show the fuel rail pressure if the pressure isn't reading then you know where to look something linked to the fuel rail sensor so injector leak back or needle stuck nozzle worn etc, and other sensors it's the best £20 if you own a vivaro I wouldn't 2nd guess,
 
#32 ·
I don't know that much about computers, I have opcom running on win7 I didn't know opcom was fussy about which operating system, someone will know
 
#35 ·
roscoe80 said:
I'm too thick for this ..... Multimeter on the wires when disconnected to the switch and van running??

Sorry
Click to expand...
Ok all you have to do is put multimeter on low volts scale, put black wire on neg battery terminal, put red wire on switch with switch commented, there are 2 wires one will read 5 volts all the time, the other goes from 0.2 at idle to about 4.5 at full revs if the pressure is ok...or as the man says use opcom and that will tell you the pressure....from Fred.
 
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