Automotive

2008 Bmw 328xi acceleration issues

  • Last Updated:
  • Dec 15th, 2018 1:58 pm
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[OP]
Newbie
Nov 13, 2017
22 posts
8 upvotes

2008 Bmw 328xi acceleration issues

I have a 2008 328xi it had a problem with the accelerator pedal my mechanic said and they replaced it but then the limp mode happened again a week or 2 later. I went back and he changed the throttle body sensor with a used one he had at the shop and now the car will run fine but the limp mode will happen again sometimes and I have to turn off the car and wait and turn it back on for the power to return to normal.
10 replies
Deal Addict
Jun 20, 2010
1380 posts
652 upvotes
I had the same problem with my civic. check the throttle/accelerator relay. pop the hood and swap it with another one to see if the problem goes away.
Last edited by eclone on Dec 14th, 2018 4:24 pm, edited 1 time in total.
Deal Guru
User avatar
Feb 11, 2007
11226 posts
10567 upvotes
Oakville
Could be many different causes. Since those parts have already been replaced I would suspect a bad ground or damaged wire harness.
Make sure your battery and alternator are in good operating condition.

You might need to check a BMW specific forum like Fanatics/Bimmerpost/e90post.
Deal Addict
Sep 8, 2017
2354 posts
2417 upvotes
GTA
Sounds like you need a better mechanic. Someone who can actually diagnose the problem and correct it, instead of guessing and changing parts randomly.
Deal Addict
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Jul 26, 2007
4171 posts
1809 upvotes
Toronto
Why don't you wait if used throttle sensor works or not?

If MAF sensor is defective, car will go into limp mode.
Jr. Member
Dec 1, 2014
102 posts
30 upvotes
Toronto, ON
Neil542 wrote:
Dec 14th, 2018 4:15 pm
I have a 2008 328xi it had a problem with the accelerator pedal my mechanic said and they replaced it but then the limp mode happened again a week or 2 later. I went back and he changed the throttle body sensor with a used one he had at the shop and now the car will run fine but the limp mode will happen again sometimes and I have to turn off the car and wait and turn it back on for the power to return to normal.
Suggest you go to a BMW specialist.. reach out to Ivo @ Columbus Automotive . Stop getting your mechanic to diagnose inaccurately, wasting time and money.
Deal Expert
Mar 23, 2004
24587 posts
4847 upvotes
Does this engine have Valvetronic? Could be a problem there since Valvetronic-equipped engines don't use the throttle (should be wide open after startup) in regular operation, only as a failsafe measure in case of Valvetronic failure. However I'd imagine there'd have to be codes set if there were a problem with the system?
Member
Dec 17, 2015
458 posts
154 upvotes
York, ON
Op better go to partsource and they will scan codes in car for you for free.

Come back and post what codes you have.

Don’t know if you can work on cars or not but you could also try crc sensor cleaner and spray the MAF. But make sure it’s unplugged before you do so. And make sure it’s dried out before plugging back in
Deal Guru
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Feb 11, 2007
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Oakville
Viperoni wrote:
Dec 15th, 2018 7:19 am
No codes no help
Did he use generic scanner or BMW specific software? Some codes can only be read with the BMW unit.
Deal Expert
Mar 23, 2004
24587 posts
4847 upvotes
engineered wrote:
Dec 15th, 2018 11:00 am
Did he use generic scanner or BMW specific software? Some codes can only be read with the BMW unit.
This, if you go to partsource, or something they're typically only going to pull up standard OBD-II powertrain codes, not manufacturer-specific codes that cover a lot more on more modern vehicles*.

*Most German cars have always had much more info than standard OBD-II, even from like 20 years ago so it's always a good idea to have these types of cars scanned with tools that can read the manufacturer codes.

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