Renault Megane 1.9 DTI F9Q 744 - Random Hard Starting | Technical matters | Back Room Forum

Mon 20 Dec 2010 22:16

Renault Megane 1.9 DTI F9Q 744 - Random Hard Starting - gwb

Having trouble starting when cold or left for more than half an hour.

Have put new glow plugs in, check glow plug controller. Replaced crankshaft sensor and temperature sensor. Checked fuel system for air leaks - ok.

The immobiliser and ignition system are fine and working as should be and key is working fine.

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Mon 20 Dec 2010 22:30

Renault Megane 1.9 DTI F9Q 744 - Random Hard Starting - Vinnychoff

is the car starting ok, quicker when the car is warm or that you get the car working?

have you changed the oil lately? correct grade used? or has it been a long time since change..

Vinny

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Mon 20 Dec 2010 23:20

Renault Megane 1.9 DTI F9Q 744 - Random Hard Starting - gwb

The car seem's to start better when warm and car is serviced regular with appropriate oil.

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Tue 21 Dec 2010 10:28

Renault Megane 1.9 DTI F9Q 744 - Random Hard Starting - madf

You almost certainly have a leak in the injection system/fuel filter letting in air.

When the car does start, the bubbles have gone. Stop for any time an dthey are back.

Before you start, try the hand pump used to bleed the system of air. If it feels soft and then hardens with use, that says air bubbles.

If so, all you have to do is find the leak.

As it's a Renault 1> I have no idea and 2> could be anywhere.

Edited by madf on 21/12/2010 at 10:28

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Sat 5 Feb 2011 21:52

Renault Megane 1.9 DTI F9Q 744 - Random Hard Starting - gwb

No air in fuel system, no leaks, not glow plugs, non of the items as in the original listing and not the wrong oil.

**NOW FIXED** IT WAS AN INTERMITTANT STARTER MOTOR FAULT WHICH DID NOT EFFECT THE OPERATION OF THE STARTER MOTOR.