clk430 slight power surges

bacardy703 · 02-06-2008, 02:09 PM

Maybe I'm paranoid, but lately I have been noticing quick power surges at random times whenever I am waiting at a stop light while my brakes are depressed. The lights on the console just go dim for a second and come right back to normal and I feel/hear a momentary buzzing sound from my brake pedal area at the same time this happens.

Immediate reaction is that it could be an electrical problem? my car has 90k on it right now with a new battery as of 2 days ago. Suggestions?
Thanks.

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rocko · 02-06-2008, 04:15 PM

Thanks for posting this! This also happens on my car with 87,000 on it...I wonder if it involves the voltage regulator? Im not sure.. thanks

[180] · 02-07-2008, 12:42 AM

what is the tachometer reading when this happens?

it could be a vacuum leak or bad idle valve.

bacardy703 · 02-07-2008, 06:45 PM

Good question, to be honest, it happens so quickly, i never had time to see the tach reading. Next time I get the surge, I'll take a quick look at the tach. Given the randomness of the surges, it could be a vacuum leak somewhere, just don't know where! i'll post again when i have more details.

rocko · 02-08-2008, 09:35 AM

Mine just happened again last night...my tach was around 500-600 while I was waiting on a traffic light.

bacardy703 · 02-08-2008, 05:59 PM

I just got back from work and noticed it happened to me twice on my drive back, both times while i was either stopped or moving very slowly. I did notice that my tach went up by 100 rpm each time it happened.... normally it's at about 600 rpm at idle and then it inched up to 700-800 during the "surge"... assuming this might be a vacuum leak, how can that be tested and diagnosed?
thanks.

gn3 · 12-10-2008, 06:54 PM

I'm having the same problem, after driving for over 30 min, only notice it at night, all the dash lights and climate control dim randomly at any RPMs. Only stops if I restart the car. Has anyone had any luck with this?

02-07-2008, 12:42 AM	#3
[180] Senior Member Join Date: Apr 2003 Location: Corona, CA Posts: 339 Drives: Kawasaki Ninja 250	what is the tachometer reading when this happens? it could be a vacuum leak or bad idle valve. __________________ 99 CLK430 -Sold!- :( Now on two wheels... :)

02-08-2008, 05:59 PM	#6
bacardy703 Almost a Member! Join Date: Jul 2007 Posts: 47	happened again too... I just got back from work and noticed it happened to me twice on my drive back, both times while i was either stopped or moving very slowly. I did notice that my tach went up by 100 rpm each time it happened.... normally it's at about 600 rpm at idle and then it inched up to 700-800 during the "surge"... assuming this might be a vacuum leak, how can that be tested and diagnosed? thanks.

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02-06-2008, 04:15 PM	#2
rocko Member Join Date: Apr 2005 Location: bay area Posts: 112 Drives: 2001 CLK	Thanks for posting this! This also happens on my car with 87,000 on it...I wonder if it involves the voltage regulator? Im not sure.. thanks

02-07-2008, 06:45 PM	#4
bacardy703 Almost a Member! Join Date: Jul 2007 Posts: 47	Good question, to be honest, it happens so quickly, i never had time to see the tach reading. Next time I get the surge, I'll take a quick look at the tach. Given the randomness of the surges, it could be a vacuum leak somewhere, just don't know where! i'll post again when i have more details.

02-08-2008, 09:35 AM	#5
rocko Member Join Date: Apr 2005 Location: bay area Posts: 112 Drives: 2001 CLK	Mine just happened again last night...my tach was around 500-600 while I was waiting on a traffic light.

12-10-2008, 06:54 PM	#7
gn3 Junior Member Join Date: Aug 2008 Posts: 57 Drives: CLK430 Cab 03	I'm having the same problem, after driving for over 30 min, only notice it at night, all the dash lights and climate control dim randomly at any RPMs. Only stops if I restart the car. Has anyone had any luck with this?

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