1997 BMW Z3 Rev counter

GERWILL

MEMBER
1997 BMW Z3
4 CYL
2WD
MANUAL
83,100 MILES

Dear Sir, when coming to a stop. My rev counter sticks/hangs around 1500 revs. This is only for a few seconds then it goes down to normal idling, around 800 revs. This happens when the engine is hot or cold.
Any ideas. Thankyou

Saturday, January 3rd, 2009 AT 12:31 PM

5 Replies

DOCHAGERTY

MECHANIC
9,601 POSTS

Indicator issues can often be nothing more than just a stuck needle. Is this an old problem or did it just pop up?

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Sunday, January 4th, 2009 AT 11:46 AM

GERWILL

MEMBER
3 POSTS

It started sticking about 2 months ago, today, coming to a stop at lights it seemed to surge up to 2000 revs then down to 1500 revs for a few seconds and then normal idle speed.

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Sunday, January 4th, 2009 AT 2:29 PM

DOCHAGERTY

MECHANIC
9,601 POSTS

So the idle speed is the issue here, or is it just the indicator?

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Monday, January 5th, 2009 AT 11:49 AM

GERWILL

MEMBER
3 POSTS

Yes, it's not the indicator, it's the idle control, it's worse when the engine is warm.

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Tuesday, January 6th, 2009 AT 3:23 AM

DOCHAGERTY

MECHANIC
9,601 POSTS

There is a device on the engine that is called the crankcase vent valve. When it fails, it presents with this symptom. Also there are several vacuum hoses that degrade over time and should be replaced as well.