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      01-22-2013, 05:03 PM   #1
bandyboi
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'55 320D auto sluggish and slow

Hey All,

I've just joined, so please be gentle.

My 2005 e90 320D 6 speed auto has started being very sluggish lately.

When I accelerate, it's pedestrian until around 2500rpm, when it feels like the turbo boosts and it accelerates normally. This is most noticeable between 30-50mph in 4-5th gear when you put your foot down, so unless the gearbox kicks down to increase revs above 2500, it doesn't go anywhere!
Should the turbo boost before this?

Some stats: 6th gear, 70mph, 2100rpm to 80mph, 2250rpm takes at least 10 seconds, before boosting.
5th gear, 60mph, 2200rpm to 70mph, 2500rpm takes at least 7 seconds.

Last edited by bandyboi; 02-15-2013 at 10:12 AM.
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      01-22-2013, 05:20 PM   #2
briers
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Investigate the pressure convector valve on the egr, egr closes at around 2,700pm so this would give a possible explanation to your symptoms. The actuator can get clogged with dirt and stick open affecting the pressure when the egr is active.

Also whilst checking, look at the vacuum pipes for perishing

Last edited by briers; 01-22-2013 at 05:26 PM.
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      01-25-2013, 07:04 AM   #3
bandyboi
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So perhaps the egr is sticking closed from the get-go? Then it runs properly from 2700rpm, where its meant to be closed.

Would that give the kind of symptoms I describe?

I'll get it off and get a look at it with some carb cleaner...

Many thanks so far!
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      01-25-2013, 08:01 AM   #4
jimpom23
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Can't hurt to reset the throttle adaptions - search on here for the sequence to do it, I did it on mine and it was much more responsive afterwards, and no it's not a placebo effect as the travel vs power vs gearing at speeds changed noticeably
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      01-25-2013, 09:41 AM   #5
bandyboi
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Cheers guys, sorted.

Last edited by bandyboi; 02-15-2013 at 10:13 AM.
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