Larry,

I thought I'd identified all the sensors on the M103 block, as well as the wires to and from the EZL ignition box. Where's the knock sensor?

Sixto
91 300SE
87 300SDL

I think the knock sensor is physically located somewhere on the left side of the block. All KE Jetronic and Motronic systems have them.

Have a great day,

Actually, yes.

When cold-starting the engine i have noticed a distinct knocking for like 2-3 seconds. Then it dissapears.

Are you saying that my knock sensor eliminates my modyfied timing?
I'm running on octane 95 btw.

Freestyler

hello

I tried removing the resistor for a few weeks now on a 86 16v
It seems to me that i lost some power in the 4- 5000 rpm,
range??? I got no knocking or pinging with 89 oct in it.
Im going to put it back soon and see if i feel a diffence?
Thanks
Dave

190e 16v
911 Iroc
gyrocopter

Attached Thumbnails

 

More likely that's chain rattle or lash adjusters that haven't pumped up.

You pretty much have to have the engine under load to get knock. Floor it in third gear at low rpm while going uphill to test for knock.

Sixto
91 300SE
87 300SDL

Freestyler,

What I'm saying is that IF knock is sensed the system will retard the timing just enough to eliminate the spark knock. Because this is automatic, you don't know for sure at any given time if knock is being sensed and timing retarded.

If you have maximum octane in the tank, and the resistor removed, I doubt that it is ever getting into the situation.

sixto is correct, spark knock, or preignition will only occur under a load with ignition advanced too far for the fuel quality being consumed.

Good luck,

I noticed that my idle is up to 900 from about 750 before I removed the resistor. This makes sense because on a non computer car if you advance the timing the idle speed will increase. Has anyone else noticed this?

Have a great day,

Nope..

Where my idle would jump up and down between approx. 450 and 550 before, it is now rock steady 500 rpm.

Freestyler

Larry - I've got an '89 300E so I'm not sure if the timing is computer controlled or not, but my idle speed is the same as before I removed the resistor - a steady 600 RPM at operating temp.

__________________
Chris
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired

"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon

Just found mine the other night (400e). Drivers side just before the firewall. There is a juncture that has several wires (ignition related I think) that plug into a harness that is on the fender well. The resistor is in the center of this jucture of wires. I will post a pic when I dig up my digital camera.

Feels more resposive but I don't know how much of that is in my head. Hope to get a few more MPGs - we'll see.

91 octane, no knock.

Hey shouldn't I "cover up" the hole where the resistor was? Any suggestions?

Pics Pleasssss

hey y'all...
anyone in here got some good info on whether 20th/21st century auto insurance is any good?

__________________
~there is no spoon~

1984 300CD Turbo Diesel (soon to be "powered by VEGGIE") - dolphin silver

1999 e430 Sport blk/blk, my sexy ***** ;-)

(my other girls)
1992 300CE 24V 3.0L (w124) (R.I.P. "she was killed 7/12/03 by some ricer kids speeding in a honda accord")
1990 Acura Integra RS (w/94' engine)
1966 Cadillac Sedan de Ville (Hardtop)

Back a few years ago I had seveal friends who were with 20th Century. Yes there rates were good but they were total NAZIs when it came to filing claims! Two of my friends were canceled after filing claims. Others had their premiums imidiately jacked up. I've been with State Farm for since 1982. I've had my fair share of accidents both my fault and not - they've always been good with paying/rectifying the situation at hand.

LOL......I was born in 1982 coool

greetings,
Albert S.

Was '82 THAT long ago!? Actually when I think of the choices in cars back then it does! Anyhow I've attached a jpeg of where the resistor is. My engine seems to idle a bit more roughly than before. You are so lucky to have so many GREAT automobiles available for such reasonable prices.