renault scenic 1.9dci

[lundy]

wont start without turning over for some time,got new plugs ,lifter pump working.can anyone tell me which relay switch for pump is at.someone said main engine top fuel pump kaput ?x reg 2001

[Hometune]

Is it only hard to start from cold or is it hot as well?

[lundy]

cold,it takes forever, once running it starts faster

[Hometune]

Ok so you replaced the glow plugs. Have you checked to see if the glow plugs are getting 12v for around 10 secs when you switch the ignition on?

[lundy]

checked they were glowing but not for 10 secs. will try and be back in touch ,thanks

[Hometune]

They may be temperature dependent so a faulty coolant temp sensor may be knocking them off too soon.

[lundy]

3 working for 15 seconds but 1 was bearly getting warm,surely it should start with 3 plugs still ? tried changing black relay switches around still no go.stop /start relay ,would that cause problems ,with it starting after a while didnt think it would.know anyone selling semtex.

[Hometune]

As it starts ok hot then suspect either 1. an air leak in the fuel system, 2. glow plug fault or 3. slight loss of compression when cold.

Next time you start from cold switch the ignition on and wait for 10 secs. Switch off. Switch on again for 10 secs and try. If it starts better now then it is definitely a glow plug issue. Ensure the correct type of plugs are fitted as there are different voltages and different lengths.

Check the fuel pipes when you first switch on and watch for air bubbles being returned to the tank. If there are a lot then it could well be a fuel pressure fault caused by a duff injector. You would need to see the data on a diagnostic tool for fuel pressure when cranking cold and do a quantity comparison check when the engine is idling hot.