Engine 850: B5254S/2.4/20v: - misfiring

jack taylor · May 2nd, 2009, 23:51

can anyone please help. My petrol pump packed up. New one fitted since when occasionally when moving very slowly forward or backward the car will judder. Now the car is misfiring whilst on the move as though there is muck in the fuel line. If I lift off it clears. When flooring it the engine coughs and sounds as though only firing on four cylinders. After a 5 to 10 seconds the engine "clears" and takes off. If I accelerate gently the misfire continues until I lift off and then maintain the slower speed.I don`t know if this problem is related to fuel or a coincidence. I once had this problem years ago on a golf G.T.i and that was a faulty plug lead.I shall appreciate any opinions. Thanks Jack.

Chris_Rogers · May 3rd, 2009, 09:13

Have you changed the fuel filter?

It may be that when the original fuel pump failed debris was passed into the filter blocking it.

warthog · May 3rd, 2009, 10:24

Jack,

I've just had almost the same symptoms as yourself along with fuel pump failure. For me the miss-fire started suddenly half way through a fun thrash back from Bristol one evening about a week after changing the fuel pump.

On checking the next day the cause was too large plug gaps (cos I'd been forgetful and not checked them in 60k miles!). Once reset the car ran fine and much smoother - there's a surprise lol

May 2nd, 2009, 23:51	#1
jack taylor Master Member Last Online: May 15th, 2022 15:53 Join Date: Jan 2008 Location: Torrenueva, Costa del Sol	misfiring can anyone please help. My petrol pump packed up. New one fitted since when occasionally when moving very slowly forward or backward the car will judder. Now the car is misfiring whilst on the move as though there is muck in the fuel line. If I lift off it clears. When flooring it the engine coughs and sounds as though only firing on four cylinders. After a 5 to 10 seconds the engine "clears" and takes off. If I accelerate gently the misfire continues until I lift off and then maintain the slower speed.I don`t know if this problem is related to fuel or a coincidence. I once had this problem years ago on a golf G.T.i and that was a faulty plug lead.I shall appreciate any opinions. Thanks Jack.

May 3rd, 2009, 10:24	#3
warthog VOC Member Last Online: Oct 30th, 2021 14:51 Join Date: Dec 2001 Location: Bristol	Jack, I've just had almost the same symptoms as yourself along with fuel pump failure. For me the miss-fire started suddenly half way through a fun thrash back from Bristol one evening about a week after changing the fuel pump. On checking the next day the cause was too large plug gaps (cos I'd been forgetful and not checked them in 60k miles!). Once reset the car ran fine and much smoother - there's a surprise lol __________________ Brian '96 T5 Estate Auto Last edited by warthog; May 3rd, 2009 at 10:26.

May 3rd, 2009, 09:13	#2
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	Have you changed the fuel filter? It may be that when the original fuel pump failed debris was passed into the filter blocking it.

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