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  #1  
Old 06-26-2007, 03:13 PM
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Question proper Idle rpm for 85 300d ?

Just got my tachometer working...
Since I played with my Idle control Knob,
I started the car and it idle'd at 1000 (not10000) oops
turned the knob a couple notches and
it is now idleing at around 850rpm...

still alot faster idle than previous.

Whats a good # ?
Or is it to taste...

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OBK #32
1985 300D Turbo (15 gal Greasecar kit installed)
(258,900+mi.) Thanks- Tachometer Fixed. Middle Vents Fixed. Transmission- 1000% better shifting.
Vac leaks- Fixed, Brakes replaced, Steering Box replaced, .... Information Rules.

Last edited by Bstef; 06-26-2007 at 03:27 PM. Reason: duh
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  #2  
Old 06-26-2007, 03:16 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
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Location: Mount Holly, NC
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900 should be stock... 10,000? um boom?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #3  
Old 06-26-2007, 03:28 PM
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uh, edited. 1000, not 10000.



thanks
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OBK #32
1985 300D Turbo (15 gal Greasecar kit installed)
(258,900+mi.) Thanks- Tachometer Fixed. Middle Vents Fixed. Transmission- 1000% better shifting.
Vac leaks- Fixed, Brakes replaced, Steering Box replaced, .... Information Rules.
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  #4  
Old 06-26-2007, 03:31 PM
vstech's Avatar
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no problemo!
where did you have to dig to fix the tach?
my 85 D tach is defunkt and the 85 TD is a euro, so no tach from the factory... I think.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #5  
Old 06-26-2007, 03:43 PM
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"where did you have to dig to fix the tach"

The fuse behind the right air vent.
The uh... uh... This thing...
overload protection relay



Red 10A fuse was blown since 2 previous owners ago.

I removed my air vent to get to it easier. seems to have been a bad idea, I cannot get the vent back on correctly... part of the plastic has snapped from the fastening ring.

I had a few people tell me that the instrument panel must have been replaced from a newer model and I shouldent have a tach. Those few people were incorrect.
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OBK #32
1985 300D Turbo (15 gal Greasecar kit installed)
(258,900+mi.) Thanks- Tachometer Fixed. Middle Vents Fixed. Transmission- 1000% better shifting.
Vac leaks- Fixed, Brakes replaced, Steering Box replaced, .... Information Rules.

Last edited by Bstef; 06-26-2007 at 08:53 PM. Reason: updated picture
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  #6  
Old 06-26-2007, 04:32 PM
winmutt's Avatar
85 300D 4spd+tow+h4
 
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Location: Atl Gawga
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Idle control "knob"? Your not talking about the one on the dash are you? Are you referring to the idle stop on the IP?
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1987 300D Sturmmachine
1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
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  #7  
Old 06-26-2007, 04:57 PM
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probably on the IP..

I thought the correct idle was 750-800?
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  #8  
Old 06-26-2007, 06:16 PM
Craig
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Quote:
Originally Posted by TheDon View Post
probably on the IP..

I thought the correct idle was 750-800?
It's supposed to be 700 - 800 according to the manual. Mine's currently set at about 600.
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  #9  
Old 06-26-2007, 06:20 PM
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I need new engine mounts, shocks, and a RDP.... at 750 it shakes the whole car..
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  #10  
Old 06-26-2007, 06:29 PM
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until it stops coughing?
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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

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1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

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  #11  
Old 06-26-2007, 06:49 PM
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This is what im using to alter my idle rpms.
In this picture the top part of the switch/dial is off...


The dial is a trimming plug for idle control. Turning the knob should raise or lower idle in 25 or 50 rpm increments.

Dunno about anyone elses model. It works on mine...

It's around 850-900 now and is nice, but could go much lower.

And so it shall...

Chicago flooded today- One hour of rain, and the 3 blocks surrounding me all have a foot+ of water in the basements. I had to move my 300D before water got in thru the bottom of the doors. Spent the day swimming in the street uncloging storm drains.

Dear Mayor, Please open the extra storm drains to the lake you farking Idiot. There are 22 basement apartments on my block alone. Please send water wings.
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OBK #32
1985 300D Turbo (15 gal Greasecar kit installed)
(258,900+mi.) Thanks- Tachometer Fixed. Middle Vents Fixed. Transmission- 1000% better shifting.
Vac leaks- Fixed, Brakes replaced, Steering Box replaced, .... Information Rules.

Last edited by Bstef; 06-26-2007 at 07:00 PM.
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  #12  
Old 06-26-2007, 07:08 PM
Ara T.'s Avatar
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That's interesting, where is that knob located.
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1985 CA 300D Turbo , 213K mi
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  #13  
Old 06-26-2007, 08:10 PM
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Passenger side footwell- on right side, in front of passenger door.
there's a little (not really little) plastic door. It's in there...

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OBK #32
1985 300D Turbo (15 gal Greasecar kit installed)
(258,900+mi.) Thanks- Tachometer Fixed. Middle Vents Fixed. Transmission- 1000% better shifting.
Vac leaks- Fixed, Brakes replaced, Steering Box replaced, .... Information Rules.

Last edited by Bstef; 06-26-2007 at 08:26 PM.
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  #14  
Old 06-26-2007, 08:15 PM
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Quote:
Originally Posted by Craig View Post
It's supposed to be 700 - 800 according to the manual. Mine's currently set at about 600.
Agreed.

The SD is at 725. It's a good speed and doesn't tend to tow you at stoplights.

I'd think that 600 would give you a case of the "shakes". That's very slow for a five cylinder.
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  #15  
Old 06-26-2007, 10:08 PM
ForcedInduction
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Quote:
Originally Posted by Bstef View Post
"where did you have to dig to fix the tach"

The fuse behind the right air vent.
The uh... uh... This thing...
overload protection relay

Very interesting. My tach died some time ago and no amount of tach amps have fixed it. My alternator light does not come on either.

I'll have to give that a try.

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