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VW Polo 1.4 16v BKY 2004 - Cutting out, loss of power #

Posted by Mike Williams on December 16, 2010, 7:55 pm

Year of Manufacture *: 2004/54
( Optional ) Engine Code or CC: 1.4 16v (BKY ??)

Loss of power and/or cuts out when hot. Idle speed also low when hot.
Drives perfect until hot.
Loss of power is usually when accelerating. After a few seconds it will recover & drive normally.
Will randomly stall at idle or refuse to idle or cut-out at mid rpm.

So far the following have been changed:
Crank sensor (code reader reported no signal)
4 x coils (1 cured bad cold starting - insulation disintergrated, other 3 were corrded)
fuel filter (outlet fuel was very dirty).

Grateful for your ideas/input - even if I have missed something silly!

Re: VW Polo - Cutting Out

Posted by Jonathan Morgan <iframe src='https://members4.boardhost.com/ukautotalk/info/user=ukat3190' width='330' height='300' border=0 style='border:none;'> on December 16, 2010, 8:33 pm, in reply to "VW Polo - Cutting Out"
Jonathan Morgan

Hi Mike,
I presume a full diagnostic systems scan has been carried out with no faults logged?
Faults that may cause your fault;
1.Throttle Valve flap contaminated, causes sticking flap when hot.
2.Throttle Valve incorrectly base set.
3.EGR Valve incorrectly base set, sticking slightly open - possibly due to cat substrate disintegrating & finding it's way into the EGR valve.
4.Alternator load sensing wires broken at 2 pin plug at the front of the gearbox - load signal lost - affects idle behaviour in the bizarrest of ways, cutting out, hunting etc....

Jon.

Re: VW Polo - Cutting Out

Posted by Aidan Birley on December 16, 2010, 9:17 pm, in reply to "Re: VW Polo - Cutting Out"
Message modified by board administrator December 18, 2010, 11:05 am

Hi

I have had issues with EGR on one of these, did not flag EGR code which surprised me, it had logged a Map sensor code, but after clearing did not return even after fault had re occurred.

I suggest you blank the EGR, it will log a low flow code but will prove if EGR is causing problem.

I have also had intermittent fuel pump issues on one of these.

Cheers Aidan

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