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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 20580
Experience:  BEng hons Mech engineering, in auto industry 22 years
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hi,just bought vauxhall vectra 3.0 cdti v6 2005. Drove from

Customer Question

hi, just bought vauxhall vectra 3.0 cdti v6 2005. Drove from birmingham to halifax and then to huddersfield and on the way back to halifax its stalled at traffic lights. Its an automatic and was in D when at trafic lights. Range was 35 miles, guage is working fine, rolled it to petrol station put 20pound diesel in. Jump starting it later on it would crack but not fire the engine at all. please adcive.. tried stating it at least 30 times with pressing bit of throttle too. engine wouldnt star teven though it cranks.Mileage is 130 k on the car.

Submitted: 3 years ago.
Category: Car
Expert:  Matt replied 3 years ago.
Helo

Its worth checking that the electric pump that feeds the main fuel pump is working correctly, it should run for a few seconds then switch off when you first turn the ignition on. If the connections to this are corroded or damaged then the pump could stop at any time. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse, ideally measure the voltage at the pump and check its getting 12V

Also if its not injecting at all then check the connections to the crankshaft sensor, unplug it and check for corroded contacts and broken wiring, and consider fitting a new sensor - do the same for the cam position sensor
If the EGR valve is stuck open then this too can effect starting so try disconnecting it to see if this helps or changes anything

Could also be an injector leaking fuel back through the overspill pipe, so not getting enough fuel pressure to tell ECU to fire the injectors, this is trickier to find and you’ll need the garage to do a ‘run back’ test to identify which one is the issue
Lastly it’s also worth considering fitting a new fuel filter as if only slightly blocked this can lower fuel supply pressure and choke the main pump, the pump will be more sensitive to this when its cold as diesel thickens considerably with low temperatures.

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