Reply With QuoteI have noticed the same thing with my car. I've only noticed it when the engine is at idle. Hasn't caused any major problems though.
I don't know what's causing it either.
I'm having an issue whereby the motor drops revs very briefly and then rebounds. Happens every few minutes independent of AC or accessory operation. Last week I noticed the dash lights would dim just before the revs dropped. Shop foreman immediately diagnosed it as a bad alternator and replaced it. The readings were 10.5 volts over 8 amps, and he said it should read 13.5 over 80 amps. So the alternator was failing, but the car still does this, though not as often. I don't have any ideas.
I have noticed the same thing with my car. I've only noticed it when the engine is at idle. Hasn't caused any major problems though.
I don't know what's causing it either.
1998 C230 - Magma Red
Pioneer in-dash CD
Bosch clear corners
H&R springs
18x8.5 Monoblock VI replicas (black)
I have a bran new alternator my car dose the exact same thing there is an electric pump that clicks in i think it controls the cooling or a/c
This might not be related, but My car used to idle rougher.... sometimes hit close to 500 revs.
However, I just did cylinder head gasket replacement, and other gaskets, my idle is ALOT smoother and runs around 650 now.
Past: 1997 W202 C36 AMG
mine bounces alittle at idle to,hasn't caused any problems though.
Susanto, how could you pull the head and not let me port it for you??
Arrrhhh
1999 C43 Obsidian Black; Penske Remote Adjustable Shocks; Adjustable Spring Perches; SSR Comp Wheels, 9.5 & 9.5x17\"; Custom 31.75mm front & 19mm rear swaybar; Ported Manifold; Limited Slip Differential, Headers and race Cats, Other Stuff
small question,is there much gain in porting the benz heads?mines a 97 230k?? thanksOriginally posted by speedybenz
Susanto, how could you pull the head and not let me port it for you??
Arrrhhh
yes dont hi-jack the thread!
Is "normal" idle supposed to be 650 revs? Is this in park or drive? mine is 500 rpm in drive at a standstill. It has always been this way since I bought it so I have no reference to what normal is.
My car kinda does the same thing, but I don't notice any lights dimming. Just drops a hair from 500 and feels like it will stall sometimes. Very frustrating.
Do our cars have any components which directly affect idle? Is there any way to fine-tune idle in our cars?
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