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1995 BMW 325 hesatation

Tiny
ARIKTENN
  • MEMBER
  • 1995 BMW 325
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 156,000 MILES
It does a couple different things. It hesatates at odd times. Sometimes at take off and then bam it takes off and when I let off the gass sometimes the gages go dead and again power loss. When I pull the main power fuse its a block 65 amp fuse itll run fine for a day and then back to this. No check engine light comes on. Ive been trying to figure this out for a while. Can anyone tell me how to fix this thing. Thank you very much.
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Thursday, August 13th, 2009 AT 10:54 AM

2 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
First thing to try is to replace the fuel pump and main relays.
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Friday, August 14th, 2009 AT 12:36 PM
Tiny
DR LOOT
  • MECHANIC
  • 2,311 POSTS
A hesitation can also be caused by a leak in the throttle body boot. A leak there allows air into the engine which has not been measured by the mass air flow sensor. Consequently, the computer gives the engine the wrong amount of gas.

Throttle body boots are always suspect in BMWs because they are made of rubber and constantly flex because the engine sits on flexible mounts while the air cleaner and mass air flow sensor are bolted to the chassis. The question is not "if" it will fail, but "when". Sooner or later they all dry up and crack. At 150k, yours is probably overdue if it hasn't been changed already.

Good Luck
Dr. Loot's Assistant
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Monday, August 17th, 2009 AT 11:04 PM

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