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Old 11-30-2018, 08:34 PM   #1
noz-e8tr
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Hey guys. I fear I did something dumb and need help sorting it out. When I did my freeze plugs on the drivers side I unplugged all sensors and moved the harness out of the way. I normally label or take pictures so I can get everything back right. But I didnít do it this time for some reason. Iíll blame it on old age. Anyway, I have several connections that use the same connector. I was hoping they would just kind of ďfallĒ into place, but I still have like 3 identical connectors that ďcouldĒ go to any of the 3 sensors. Basically Iím looking at the knock sensors, the cold start injector and one other that hooks to a connector mounted on a thin metal tab What I really need is picture/video showing the sensors connection and where that connection goes to meet the wiring harnesses. Start with the knock sensors. Where does it connect to the harnes? A few pictures would probably help me figure it out. Video would be stellar.

Btw. 1990 740 Turbo. Help a dumb bro out.

Text pictures or video if possible to 361-815-5826. Or pm me. What ever works for you.
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Old 11-30-2018, 09:43 PM   #2
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There are some nice new harnesses, along with labelled pictures, available on Dave Barton's site -- 240turbo.com
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Old 11-30-2018, 10:33 PM   #3
PromiseRing
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If it’s anything like a 240, I may have some advice. Also, could peel back the rubber boot and check wire colors, then compare them with a wiring diagram.

On a 240, the knock sensor and temp sending plug come from the same loom. Only those 2 connections. Since they are different, it will be obvious that the one that isn’t the temp sensor, is the knock sensor. Then, on the other loom, I think it’s the IAC, TPS, and maybe a red wire for the starter? Anyway, based off the pics I took during my engine swap, one of the wires for the TPS is white/blue. So that one connects to TPS, and other would default to IAC. Also in my experience, cold start injector connector is always blue. Again, this is all from looking at and working on a 240 recently..

Let me check my 1990 744 NA.

Edit: my apologies. It’s a bit different from the 240 loom (duh). However, I can tell you that my CSI connector is blue, knock sensor connector is black, IAC connector is white/gray, and TPS connector is black.
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Knipex pronunciation: /kəˈnɪpɛks/
The K is pronounced like normal. The upside down e (referred to as a Schwa) is pronounced like "uh".
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Old 11-30-2018, 10:55 PM   #4
noz-e8tr
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This may help a lot. Iíll look closed at colors tomorrow.

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Let me check my 1990 744 NA.

Edit: my apologies. Itís a bit different from the 240 loom (duh). However, I can tell you that my CSI connector is blue, knock sensor connector is black, IAC connector is white/gray, and TPS connector is black.
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Old 11-30-2018, 11:07 PM   #5
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Ok just went out in the rain and took a quick look. If the connector colors above are accurate on a 1990 turbo, I have the CSI and Knock sensors backwards. This is what I really needed to know.
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Old 12-01-2018, 12:11 AM   #6
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Quote:
Originally Posted by noz-e8tr View Post
Ok just went out in the rain and took a quick look. If the connector colors above are accurate on a 1990 turbo, I have the CSI and Knock sensors backwards. This is what I really needed to know.
Every CSI connector on a b230 lh2.4 Iíve ever seen is blue. So if thatís your only concern, Iíd swap them around. I would assume that the blue connector gets 12v on cold start cranking/idle. The knock sensor should not (assumed).
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Old 12-01-2018, 10:31 AM   #7
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That’s what is was. Root cause of my car running crappy was my stupidity. CSI and knock sensors connection was switched.
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Old 12-01-2018, 11:56 AM   #8
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Good find. Without the knock sensor detected the timing was always pulled making it run crappy.
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Old 12-01-2018, 12:49 PM   #9
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Crappy does not even begin to describe how bad it ran. Guess that knock sensor is kind of important. Lol

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Good find. Without the knock sensor detected the timing was always pulled making it run crappy.
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Old 12-01-2018, 01:34 PM   #10
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Quote:
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Root cause of my car running crappy was my stupidity.
I think thatís the case with every car on this forum.
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