Jumpy RPM gauge

lamal3 · 12-27-2010, 04:56 AM

Hi guys,

I was wondering if you guys encountered anything like this on their E82 N54 engine during acceleration? I was driving today and then all of a sudden the RPM needle dropped down to 1500 RPM while I was travelling 70 KMS. I felt like the car couldn't accelerate for a moment. What was that I was experiencing? It was like it was a sudden loss in power for a second. I had my car since 2008 and so far I didn't experience anything bad happen up till now. Could this be a HPFP? I don't have any problems with starting the car up at all. I need a little help on this one. Can anybody figure this out?

Much Appreciated.....................

miro2296 · 12-27-2010, 12:57 PM

sounds like the HPFP. Have you been having issues in the morning when starting her up prior to this?

escobar929 · 12-27-2010, 01:45 PM

what did you do to get the car back to normal? restart?

ive seen a few HPFP fail like that but not many, most get a code right away and of course the long cranks

lamal3 · 12-28-2010, 03:48 AM

Quote:

Originally Posted by escobar929

what did you do to get the car back to normal? restart?

ive seen a few HPFP fail like that but not many, most get a code right away and of course the long cranks

I'm not sure if it's the HPFP. I don't have any issues with start ups at all it starts up fine. Actually while I was driving the RPM needle dropped and then it felt like it lost power and so I gently put my foot on the accelerator and then it seemed like the car wouldn't go but I let my foot off the accelerator again for 2 seconds and then accelerated again the car came back alive again. It's almost like a sudden jerking accelerating. I get this feeling when you accelerate and then brake and then begin accelerating again. It's like the power isn't there after this happened. It feels strange for sure. I can't pin point it. I'm kinda worried about taking my car for long trips, not sure what to do...

RimasRS · 12-28-2010, 04:34 AM

Your car is AT or MT? Maybe it's just gearbox reacts slowly. Like you said RPM dropped. So car had to loose the speed also?

Also what you guys calling long starts in the morning? For example mine is little longer than during the day. In the morning it's like maybe 2 seconds start.

escobar929 · 12-28-2010, 07:27 AM

Quote:

Originally Posted by lamal3

I'm not sure if it's the HPFP. I don't have any issues with start ups at all it starts up fine. Actually while I was driving the RPM needle dropped and then it felt like it lost power and so I gently put my foot on the accelerator and then it seemed like the car wouldn't go but I let my foot off the accelerator again for 2 seconds and then accelerated again the car came back alive again. It's almost like a sudden jerking accelerating. I get this feeling when you accelerate and then brake and then begin accelerating again. It's like the power isn't there after this happened. It feels strange for sure. I can't pin point it. I'm kinda worried about taking my car for long trips, not sure what to do...

yea, it def doesnt sound like a HPFP. Could be a hick up in the tranny, if you are worried take it to the dealer and have them check it out

has it ever happened again?

12-27-2010, 04:56 AM	#1
lamal3 Enlisted Member 4 Rep 42 Posts Drives: BMW 135i Join Date: Nov 2008 Location: Vancouver iTrader: (0)	Jumpy RPM gauge Hi guys, I was wondering if you guys encountered anything like this on their E82 N54 engine during acceleration? I was driving today and then all of a sudden the RPM needle dropped down to 1500 RPM while I was travelling 70 KMS. I felt like the car couldn't accelerate for a moment. What was that I was experiencing? It was like it was a sudden loss in power for a second. I had my car since 2008 and so far I didn't experience anything bad happen up till now. Could this be a HPFP? I don't have any problems with starting the car up at all. I need a little help on this one. Can anybody figure this out? Much Appreciated.....................
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12-27-2010, 12:57 PM	#2
miro2296 Colonel 57 Rep 2,251 Posts Drives: '08 Montego Blue BMW 135i Join Date: Nov 2008 Location: Round Rock, TX iTrader: (1)	sounds like the HPFP. Have you been having issues in the morning when starting her up prior to this? __________________ ------------------------------------- BMW 135i/6 Speed/Montego Blue/Formula One Ceramic Tint/JB4 G4/AA Sport Intercooler/19 inch Iconz 880Z(19X8.5 & 19X10)/PSS 225/35 & 265/30/E93 M3 front sway bar/TRW front and rear Control Arms/BMS Drop In Filter/Dinan Exhaust/BlackLines/Upgraded \\\M RSFB
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12-27-2010, 01:45 PM	#3
escobar929 Brigadier General 154 Rep 4,528 Posts Drives: M2 CS Join Date: Aug 2009 Location: Hollywood, FL iTrader: (14) Garage List 2020 M2 CS [10.00] 2020 M240i [0.00]	what did you do to get the car back to normal? restart? ive seen a few HPFP fail like that but not many, most get a code right away and of course the long cranks
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12-28-2010, 04:34 AM	#5
RimasRS Colonel 85 Rep 2,438 Posts Drives: BMW X3 SD Join Date: Sep 2010 Location: Europe iTrader: (0)	Your car is AT or MT? Maybe it's just gearbox reacts slowly. Like you said RPM dropped. So car had to loose the speed also? Also what you guys calling long starts in the morning? For example mine is little longer than during the day. In the morning it's like maybe 2 seconds start.
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