Running rough after hard acceleration

genghisk · Jan 15th, 2020, 20:29

Hi all. So I took off from the lights quite hard today and then it ran rough for a few minutes ie struggled to rev up. Then it went back to normal???
Any ideas.

It's a 97 V40 T4 CD by the way with 80k and fsh

Baffler · Jan 16th, 2020, 15:22

First thing that springs to mind is a lazy fuel pump. The fuel pump on the T4 tend to become lazy at approximately 100k miles. When it occurred did it happen to be low on fuel by any chance?

The other thing to check is for hairline cracks on the insulator of each coil pack (they can arc against the head) and that the springs in each insulator are making good contact with the top of the spark plugs. They can be stretched/pulled out slightly.

Jan 15th, 2020, 20:29	#1
genghisk Junior Member Last Online: Aug 10th, 2020 08:12 Join Date: Mar 2013 Location: liverpool	Running rough after hard acceleration Hi all. So I took off from the lights quite hard today and then it ran rough for a few minutes ie struggled to rev up. Then it went back to normal??? Any ideas. It's a 97 V40 T4 CD by the way with 80k and fsh

Jan 16th, 2020, 15:22	#2
Baffler Premier Member Last Online: Yesterday 16:05 Join Date: Dec 2002 Location: Co. Limerick, Ireland	First thing that springs to mind is a lazy fuel pump. The fuel pump on the T4 tend to become lazy at approximately 100k miles. When it occurred did it happen to be low on fuel by any chance? The other thing to check is for hairline cracks on the insulator of each coil pack (they can arc against the head) and that the springs in each insulator are making good contact with the top of the spark plugs. They can be stretched/pulled out slightly. __________________ Liam... '96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.

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