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  #1  
Old 08-15-2003, 11:58 PM
mike690003's Avatar
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Join Date: Apr 2003
Location: Miami,FL
Posts: 807
300E idles at 500rpm!! IS IT NORMAL???

Hello Board,
My 300E has been doing this for a while. The idle speed is at a dismal 500RPM!!!!. I at first thought that it was normal, my car sounds quiet,but it feels very underpowered during acceleration. I have cleaned out the idle control valve. What could be causing this??


I have replaced:
Cap and rotor
Plugs and wires
Air filter
Cleaned idle control valve
All vacuum lines
Fuel filter
Injector seals


What could it be??

ECU??
O2 sensor??
Fuel injectors??

HELP!!!
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1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
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Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
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  #2  
Old 08-16-2003, 02:11 AM
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Join Date: Jun 1999
Location: Surrey, Beautiful British Columbia, Canada
Posts: 750
500 is low but if it idles smoothly and will not stall
it has to be ok.

mine idles at 650-700 range. if you haven't done so,
clean throttle linkages, pour injector cleaner - techron,
and drive long and hard.
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  #3  
Old 08-16-2003, 03:25 AM
mike690003's Avatar
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Join Date: Apr 2003
Location: Miami,FL
Posts: 807
Well this is an "open" question, but what could be the cause of my car's dismal 500rpm idle.
My previous 1989 300E idled at a steady 800rpm, but it also had issues.It's gone now.
What could cause my 1987 to have this low idle??

Would a worn potentiometer cause this??
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
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  #4  
Old 08-18-2003, 10:27 PM
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Join Date: May 2003
Location: bullhead city, az hot as hell
Posts: 301
my 86 now idles at 600, after putting a new o2 sensor, before it was 700, same as you new plugs wires ete. ran bad at first so I disconnected the battery for a little bit it smoothed out I will know more next tank of gas
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  #5  
Old 08-18-2003, 11:12 PM
dtf dtf is offline
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Join Date: Jul 2003
Location: South East CT
Posts: 824
Just a suggestion - run a search using 'CIS' (the fuel injection system you have, I think), 'low idle' and 'underpowered' and see if it flags anything. The search function is quite good on this site.
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1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (203,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles)
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (124,034 miles)
2014 E350 4Matic Wagon 48,000 miles
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  #6  
Old 08-18-2003, 11:14 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
If I remember correctly, 650 or so out of gear, 500 in gear is the correct speed.

Peter
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  #7  
Old 08-19-2003, 01:02 AM
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Join Date: Jun 1999
Location: Surrey, Beautiful British Columbia, Canada
Posts: 750
i believe the fluctation should only be 500rpm max!!
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