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Old 15-02-2017, 03:26 PM
Jimmy2pasties Jimmy2pasties is offline
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Question R129 300 24 engine wiring loom

Hi, I am new to this club but have been an MB owner of various models for nearly 20 years and have recently acquired the above 1992 SL. I bought this at auction without understanding some of the pitfalls and yes the head gasket had gone along with the OVP relay, the Idle air control valve, viscous fan and various other bits.
To cut a long story short I managed to get it running sweetly last summer and it recently let me down with the symptoms of a failed IAC valve, ie will not run at tickover. The following day it ran fine.
I have read about the state of the wiring looms of cars this age and this is my question does anyone repair these?
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Old 15-02-2017, 04:05 PM
LostKiwi LostKiwi is offline
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Quote:
Originally Posted by Jimmy2pasties View Post
Hi, I am new to this club but have been an MB owner of various models for nearly 20 years and have recently acquired the above 1992 SL. I bought this at auction without understanding some of the pitfalls and yes the head gasket had gone along with the OVP relay, the Idle air control valve, viscous fan and various other bits.
To cut a long story short I managed to get it running sweetly last summer and it recently let me down with the symptoms of a failed IAC valve, ie will not run at tickover. The following day it ran fine.
I have read about the state of the wiring looms of cars this age and this is my question does anyone repair these?

Try Sileck - they rebuild your loom. Takes a couple of weeks and its best if you pre-book it in for them to do.
http://www.sileck.co.uk/
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Old 15-02-2017, 04:44 PM
robparker robparker is offline
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Although if yours is a 300-24 you should have ke jet injection so I don't think you will have wiring loome issues..
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Old 16-02-2017, 07:44 AM
chardF chardF is offline
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You don't have the infamous disintegrating loom. Still worth having a look, old stuff can deteriorate.

If you do find problems I doubt it'd be the whole loom though, so look @ a local repair.
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Old 16-02-2017, 08:10 AM
Jimmy2pasties Jimmy2pasties is offline
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Thanks for the updates, which models are affected by the loom issue?

I will explore the local repair option.
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Old 16-02-2017, 08:58 AM
LostKiwi LostKiwi is offline
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I seem to recall it was MY 1993 onwards models (certainly true of the V8s).
If yours is a late 92 it may be affected?

Easiest way to check is to look at any exposed part of the loom and check for exposed wiring or crumbling insulation. The usual places for it to fail are in hot zones (around the head so check the temperature sensor wiring - its where the issue is obvious on my V8).

Last edited by LostKiwi; 16-02-2017 at 09:01 AM.
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Old 16-02-2017, 09:05 AM
robparker robparker is offline
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It's models with the new injection system, which yours isnt, so the 280 and 320 models (and yes the v8s and v12s too).
Yours is essentially a 24v m103
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Old 16-02-2017, 11:38 AM
chardF chardF is offline
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As Rob says biodegradable harnesses for the 6 cylinder models came in on the HFM 2.8/3.2 engines.
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Old 17-02-2017, 04:37 PM
Jimmy2pasties Jimmy2pasties is offline
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Thanks very much all you have saved me the expense of a full engine harness
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