Hey everyone,

Recently my om603 1987 300d started idling weird, after trying to find why, Ive only found that the wiring harness that goes from the battery area to the temperature sensors causes it, but when i push it towards the air filter a bit, it makes the engine run perfect.

Could anyone point me to what could change the engine idle speed in that harness so i know what wire to chase down?

I can get a video or pictures on here to show what im talking about if that helps.

Thanks,
Alex

it's a witch

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1985 300SD
1998 Jetta TDI
Previous: lots of diesel VW's, MB's, KW's, Pete, Freightliner


Walking isn't a lost art: one must, by some means, get to the garage.

i thought chupacabras and a witches were completely different

semantics????
i'm just being a smartass and it seemed to fit...

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1985 300SD
1998 Jetta TDI
Previous: lots of diesel VW's, MB's, KW's, Pete, Freightliner


Walking isn't a lost art: one must, by some means, get to the garage.

i still need to figure out whats going on with my harness

the electronic idle control maybe? is it only at idle, or underway?

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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!

The idle speed is electronic. Three pin connector on ip goes to firewall, to a computer box in front of the battery.

@vstech its only at idle

@aaa thanks, ill check it out tomorrow when its light out

I would say that it is neither a witch nor a chupacabra, that it's more likely possessed.

There's likely a bad contact or decaying wire inside that harness and I would carefully dismantle until I found the culprit and fixed it.

If ghosts start to come out while you're dissecting I would walk away from it...lol

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Steve A
92 W140 OM603
97 VW Jetta TDI
90 Passat variant TDI 6 speed MT
94 Chevy K1500 6.5TD
05 E320 CDI
+ others

Just wanted to update everyone, i found the cause of this.

One of the sleeves that connects onto the pin of the (red thing in the back of the IP) was loose. Cleaned it, crimped it, good to go.

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1987 300D W124.133

Oh yeah, it was a two pin connector, not a three pin. Was thinking of the wrong connector.