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Renualt Megane 1.6 8V 1999 - Misfire only on tick over - Fixed #

Posted by Richard Mackereth on June 3, 2010, 9:24 am

Year of Manufacture *: 1999
Engine Size and Code *: 1600 8valve Code K7M 703
( Optional ) Scanner Used: Dec
( Optional) Fault Codes: o2 sensor

HELP.....This car is proper doing my head in.

It has a bad mis-fire on idle only, if you un-plug No.4 injector it doesn't alter a bit.
It run sound once it is off idle with no mis.
We have changed every thing, plugs, leads, coil, we have checked tappet clearances, even swapped 2 injectors over. nothing changes the fault. I've scoped all injectors and both sides of the coil and everything looks fine. All compressions are good and within 10% of each other.

I am now thinking that it might have a sticking valve / needs a decoke but it's a big job for the old lad to pay for if it don't fit the problem.HAS ANYONE HAD ONE LIKE THIS ?

Re: Renualt Megane Mis-fire only on tick over

Posted by Pete Mutlow <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1569' width='330' height='300' border=0 style='border:none;'> on June 3, 2010, 10:16 am, in reply to "Renualt Megane Mis-fire only on tick over"
Peter Mutlow

Morning Richard,

You may be on the right lines with this but have you considered an air-leak causing the misfire? An exhaust emission check might give you some pointers.

Regards

Pete M

Fixed #

Posted by Richard Mackereth on June 3, 2010, 12:56 pm, in reply to "Re: Renualt Megane Mis-fire only on tick over"
Message modified by board administrator June 3, 2010, 2:18 pm

Why oh why, when were rushed off our feet do we over look the silly stupid simple things ERRRRRRRRR I could screem.

Just used smoke pro and it's pissin smoke out aroung the inlet gasket area....CHEERS PETE

Re: Renualt Megane 1.6 8V 1999 - Misfire only on tick over - Fixed #

Posted by Peter Warman <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=Peter+Warman' width='330' height='300' border=0 style='border:none;'> on June 3, 2010, 2:32 pm, in reply to "Renualt Megane 1.6 8V 1999 - Misfire only on tick over - Fixed #"
Peter Warman - Administrator

Hi Richard

That was a good fix, just shows how invaluable a smoke machine can be

Peter

Re: Renualt Megane 1.6 8V 1999 - Misfire only on tick over - Fixed #

Posted by les smith <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1209' width='330' height='300' border=0 style='border:none;'> on June 3, 2010, 5:36 pm, in reply to "Re: Renualt Megane 1.6 8V 1999 - Misfire only on tick over - Fixed #"
Leslie Smith

OK to point things out after the fix but a vac guage would have cancelled out injectors and spark and pointed to an air leak(or sticking valves). Been there.

Les

Re: Renualt Megane 1.6 8V 1999 - Misfire only on tick over - Fixed #

Posted by Pete Mutlow <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1569' width='330' height='300' border=0 style='border:none;'> on June 3, 2010, 7:21 pm, in reply to "Re: Renualt Megane 1.6 8V 1999 - Misfire only on tick over - Fixed #"
Peter Mutlow

...........or a blast of easy start around the inlet manifold

HTH
Pete M

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