Tickover Lumpy

Dse 2.5 Bmw Engine Some Times Tickover Gets Lumpy Like Engine As Got Miss Fire Any Clues From Any One

hi bryan, does it do it all the time, or stop after the engine has warmed up?

btw, used to live in stourbridge 15 years or so ago, my son went to kingswinford c&e junior school

seems to do itmore when it gets warm

BRYAN1 said:

seems to do itmore when it gets warm

Click to expand...

I realise this thread is a little old now but I have this EXACT problem. 96,000 2.5 BMW engined P38A that is fine when cold but once warm it tickes over like a bag of spuds.

Have had all pipes checked and a number of injector cleaners through her but it's still as bad.

Has anyone got any idea what the problem could be ? I was wondering if it was a common sensor fault maybe.

Thanks
Don

I have a similar problem. If decelerating to a stop, the tick-over is lumpy abd erratic but if you blip the throttle slightly is clears instantly and ticks over correctly. My mileage is about 92,000 on a 1999 2.5 DSE. Any ideas please?

I have exact same problem with similar age and mileage car
91000 1998
Tick over lumpy when hot give it a blip and it goes away

Finally solved my lumpy tick-over problem. I first changed all the bits such as diesel return lines, coolant temperature sensor, O-rings on fuel lines etc.(See rangie.com site). Also leaving the tank cap in the 'vent' position so no vacuum builds up. They all appear to make a slight sifference but in my case the problem was the in-tank fuel pump. At a mileage around 100K (some get higher mileage)the brushes can become intermittent before they fail completely. This causes intermitted low fuel supply pressure giving lumpy tick-over. When it fails completely it caused hard starting. Blipping the throttle temporarily increases the fuel line pressure by using the injector pump to boost it. There is no current sensing on the supply to this pump so you don't necessarily get a fault code. Part no. ESR1111 on the 2.5 DSE. You have to drop the tank to change it - 5 bolts and its easier using a ramp. The supply to this pump is via relay RL12 and it is interesting to see that if you remove the relay completely, the engine still runs, but obviously without a working fuel pump!