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      06-14-2022, 01:50 PM   #1
RichRoberts44
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Looking for help - painfuly slow acceleration under 3k rpm

So a little background.

e91 2008 2.0 320d n47 engine 88,000 miles

Last year got turbo wine so had the turbo replaced.

About 4 months ago, was trying to pull around a lorry on dual track, changed lanes, foot down a bit and nothing....nothing...nothing... then at 3k RPM turbo kicks in but seems like it overboosts, revs got 6k and has a bit of a clunky change, then lag again until 3k rpm.

Had a scoure around and believed the MAF sensor could be at fault, Picked up a new 1 and viola, problem resolved.....until an#bout 1 month later. Car was absolutly fine until then now its back to the way it was.

Could the MAF be faulty already? When I had my turbo replaced the mechanic said a glow plug had gone but as it started ok even in the cold I shouldnt be too concerned. Could it be that? Running out of ideas. I've also tried the throttle reset but noticed no difference, I have it booked in on 27th but hoping to resolve myself.

I dont have a code scanner unfortuantly except a standard one which reports no errors.
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      06-15-2022, 11:51 AM   #2
BMW33
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Quote:
Originally Posted by RichRoberts44 View Post
So a little background.

e91 2008 2.0 320d n47 engine 88,000 miles

Last year got turbo wine so had the turbo replaced.

About 4 months ago, was trying to pull around a lorry on dual track, changed lanes, foot down a bit and nothing....nothing...nothing... then at 3k RPM turbo kicks in but seems like it overboosts, revs got 6k and has a bit of a clunky change, then lag again until 3k rpm.

Had a scoure around and believed the MAF sensor could be at fault, Picked up a new 1 and viola, problem resolved.....until an#bout 1 month later. Car was absolutly fine until then now its back to the way it was.

Could the MAF be faulty already? When I had my turbo replaced the mechanic said a glow plug had gone but as it started ok even in the cold I shouldnt be too concerned. Could it be that? Running out of ideas. I've also tried the throttle reset but noticed no difference, I have it booked in on 27th but hoping to resolve myself.

I dont have a code scanner unfortuantly except a standard one which reports no errors.
Have you checked for boost leaks? Is there any hissing sounds under acceleration? Maybe try removing the negative terminal on the battery for around 30 seconds that should help reset everything and see how you get on from there. Unfortunately with the amount of electrics modern cars have your only way really is to scan it and take it from there.
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      06-16-2022, 12:53 PM   #3
RichRoberts44
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Will any garage be able to scan for underlying codes or does it need to be a specialist?

I thought maybe a leak but the problem is intermittent (forgot to add that) so ruled that out.

Scanned it with my cheap ODB reader and returned no fault codes

Last edited by RichRoberts44; 06-16-2022 at 01:09 PM..
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      06-17-2022, 07:27 AM   #4
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Quote:
Originally Posted by RichRoberts44 View Post
Will any garage be able to scan for underlying codes or does it need to be a specialist?

I thought maybe a leak but the problem is intermittent (forgot to add that) so ruled that out.

Scanned it with my cheap ODB reader and returned no fault codes
Yes any garage with a decent machine will be able to scan it for you.
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      06-22-2022, 05:15 AM   #5
mjn77
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Sounds like a boost leak to me.
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