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Matt
Matt, Mechanical Engineer
Category: Audi
Satisfied Customers: 21599
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Skoda Fabia diesel wont start when warm, engine turns over

Resolved Question:

Skoda Fabia diesel won't start when warm, engine turns over but doesn't keep running
Submitted: 2 years ago.
Category: Audi
Expert:  Matt replied 2 years ago.
Hello
1st 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, 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
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