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  #1  
Old 12-07-2008, 06:27 AM
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oil pressure reading w/key in glow position?

When turning key to the glow position, is it normal for my oil pressure indicator to jump to above zero, or is my sender going bad? This is on the 92 300D. Thanks!

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  #2  
Old 12-07-2008, 11:28 AM
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is the sensor electrical or mechanical?
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  #3  
Old 12-07-2008, 11:52 AM
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I believe that mine goes full-scale when I turn on the key, back to normal when it starts.
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  #4  
Old 12-07-2008, 12:10 PM
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I've always been curious about this with regard to the SD. It jumps up to 1.0 in the glow position. It makes me wonder if the running position is accurate.
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  #5  
Old 12-07-2008, 06:15 PM
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afaik It should sit on 0 untill running, thats what all of mine do...
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1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
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1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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  #6  
Old 12-07-2008, 07:13 PM
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Quote:
Originally Posted by cscmc1 View Post
When turning key to the glow position, is it normal for my oil pressure indicator to jump to above zero, or is my sender going bad? This is on the 92 300D. Thanks!

All of the w124 mercedes Ive driven do that so its most likely normal.
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  #7  
Old 12-07-2008, 10:08 PM
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My 124 car's oil pressure electric gauge stays at zero until the pressure builds up. It's actually faster responding than my 123 car since the latter has a mechanical gauge and the pressure has to travel up the little tube to the dash.

When my 124 had a bad oil pressure gauge sender (mounted on the oil filter block) it would read above zero with the car turned on but not running. My first guess, therefore, would be bad sender. A new sender cured my problem. It took my mechanic two senders over 6 months to get me a good one, BTW.

Jeremy
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Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
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  #8  
Old 12-07-2008, 10:13 PM
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My dad's 300SDL goes up to 3 on ACC and goes to 0-3 bar when started...
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1994 S350 357k mi Retried as parts car
1984 300TD 214k mi Blown OM617 Poss OM603 Swap??

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1987 300SDL 200K+
1994 S320 181K mi
2008 E320 Bluetec 127k mi
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  #9  
Old 12-08-2008, 01:19 AM
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Quote:
Originally Posted by Actros617 View Post
My dad's 300SDL goes up to 3 on ACC and goes to 0-3 bar when started...
Please explain what "goes to 0-3 bar when started" means. Do you mean that it ends up somewhere between 0 and 3 bar? or that (after being at 3 bar in position 1 – ACC) it drops to 0 and then goes up to 3 bar? or something else? I want to make sure I understand you, I've never had a W126 car.

Jeremy
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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #10  
Old 12-08-2008, 01:24 AM
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IIRC mine stays at 0 until the oil pressure comes up...

-Jason
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  #11  
Old 12-08-2008, 02:00 AM
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OP reading at "Glow"

Nope,
'Just went out and turned key to "Glow"...OP Gauge unresponsive.
Engine Start- OP gauge pegs.

Yours might be sensor (As suggested) [Or Wiring problems]
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  #12  
Old 12-08-2008, 09:21 AM
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Quote:
Originally Posted by Jeremy5848 View Post
Please explain what "goes to 0-3 bar when started" means. Do you mean that it ends up somewhere between 0 and 3 bar? or that (after being at 3 bar in position 1 – ACC) it drops to 0 and then goes up to 3 bar? or something else? I want to make sure I understand you, I've never had a W126 car.

Jeremy
My personal guess on this one is that the OP gauge loses power when the starter circuit is engaged and shuts off all the accessories to provide every last bit of available current to the starter. The sensor's grounded out, it pegs to 3 any time the gauge has power, they hit the starter and it drops to zero, and then as soon as the voltage comes back it pegs again.

IF their gauge EVER reads anything while the engine is running (like a warm idle) besides a pegged 3, then I'm wrong.

Mine, for the record, stays fully at zero until the engine is running and has pressure.

EDIT: I just realized why this doesn't exactly make sense. The electrical OP gauges do not lose power under starting, because I just remembered that I can watch my starter bring the oil pressure up from zero before the engine ever starts firing on its own. So, I'm changing my guess to "wiring problem" Sorry
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  #13  
Old 12-08-2008, 09:35 AM
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I'm still going with normal, a gauge check just like the lights coming on. Mine both did the same, full-scale when first turned on, then reading normally in start and after starting.
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  #14  
Old 12-08-2008, 09:53 PM
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ok, I'm curious to what it reads right after you turn it off then?
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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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  #15  
Old 12-08-2008, 11:24 PM
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"It depends"

Quote:
Originally Posted by Johnhef View Post
ok, I'm curious to what it reads right after you turn it off then?
1. 617 engine w/mechanical gauge – sinks to zero over a couple of seconds after engine is shut off.

2a. 603 engine w/electric gauge – goes immediately to zero when key is turned OFF.

2b. 603 engine w/electric gauge – sinks to zero over a couple of seconds after engine is shut off with STOP lever (key left ON).

Jeremy

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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