Thread: TD5 injector harness - a different idea

Originally Posted by LOVEMYRANGIE

The original problem was the sealing of the pins in the socket. Early AMP plugs had the pins cast in place relying on the plastic sealing against the pin in the injection process.
Over time with heat, the pins along with capillary action caused the oil to pass from socket to the external plug and wick along the external harness.

This was solved some time ago with a new plug on the injector harness which is relatively cheap and is generally widely available thru aftermarket sources such as Paddocks etc etc. Just look for anyone advertising as a modified unit.

Be aware that it may take some time for the external harness to clear itself and although you flush it and clean the ECU, it will still pass oil lodged in the harness for anything up to 12 months as was in my case.

Excellent news - thanks!

I'll chase up a new "modified" harness asap

onebob

Originally Posted by MarknDeb

An interesting idea was given to me today on this problem and the guy is going to look into, his idea is to fit relays to the wires thus it should stop the oil tracking, i will keep on him for this, i had a look at the plug on the front of the head and the oil is there now and wasnt a week ago

Solid-state relays would give you the isolation... but oil wicking up through the harness would still be there...

Originally Posted by mousie

I guess in my mod i never really explained what is happening here. The loom can be full of oil and the car will perform as normal, after all, the loom enters the head and is fully oil bathed to the injectors. The issue where things go pear shaped is at the pins to ecu. The close proximity vs current thus causing the breakdown across the pins within the connector. The injectors consume large currents and you be surprised how much so any idea or mod as chopper suggests will work so long as you stop the oil before it enters the ecu plug. Oil in the entrance to the cylinder head can be full of oil but the distances and method of connecting will not affect the engine so concentrate on ecu side if nothing else if on the fly and you get a miss or two.

Is it really the case that it's not a problem to have the injector plug pins covered in oil - I would have thought that this would cause reduced voltage? I don't have any oil at the plug at the front of the rocker cover and the new injector harness has been in place since 2007 and about 70,000kms ago. I see that Bruce Davis sell a modified injector harness for $220 where they have soldered around the pins to stop oil migrating along the wires. However, presumably this won't stop oil around the pins themselves unless the plugs have improved seals or silicon to stop oil getting into the plug in the first place?

The looms are $45 each ex UK,buy one,run for 12months,throw away,fixed. Pat

Originally Posted by PAT303

The looms are $45 each ex UK,buy one,run for 12months,throw away,fixed. Pat

Why???

Originally Posted by PAT303

The looms are $45 each ex UK,buy one,run for 12months,throw away,fixed. Pat

I don't think regular replacement will solve the issue I'm concerned about. I haven't had migration of oil through the wires to the plug at front of rocker cover in 8 years/70,000kms, but I do have a lot of oil in the plugs and on the pins at the injectors and I assume this occurs pretty quickly due to the design of the plugs and the fact that they're not completely sealed...so what I want to know is:

. is oil on the plug pins a problem? (some posts above suggest that it's not, as long as oil doesn't make it to the ECU)

. if it is a problem, have people had a long-term solution by using silicon or resin?

Originally Posted by discovery39

Why???

The loom lays in hot oil which makes them hard,the insulation,grommets then leak,for $45 I would look at them as consumable's. Pat

Originally Posted by PAT303

The loom lays in hot oil which makes them hard,the insulation,grommets then leak,for $45 I would look at them as consumable's. Pat

Who in the UK has them? I need to do mine and for $45 I will order one.