Td5 Injectors

[d2dave]

I have taken my D2 Td5 to a diesel specialist to confirm what I had always thought.

It is blowing a lot of black smoke at idle, especially when first started.

I have suspected a dodgy injector and the specialist said the same.

They suggested that they be removed and sent away for testing at a cost of about $80 each.

Is there any way that the dodgy one can be identified in the vehicle, so I can just buy a new one and fit it?

[Disco Muppet]

Stick the nanocom on it and check the cylinder balances

[d2dave]

I have done that and they are all over the place.

[Disco Muppet]

At idle?

[d2dave]

At idle?

Yep

[sierrafery]

Are you sure about the glow plugs?, i mean if they are all OK and if yes that they actually get feed?, also when was the injector loom last time replaced?(did you check for oil at the red plug and head plug?) ... IMO you should rule out 100% everything else cos td5 injector failure is quite rare, eventually run a good brand injector cleaner through them

[d2dave]

Are you sure about the glow plugs?, i mean if they are all OK and if yes that they actually get feed?, also when was the injector loom last time replaced?(did you check for oil at the red plug and head plug?) ... IMO you should rule out 100% everything else cos td5 injector failure is quite rare, eventually run a good brand injector cleaner through them

4 new genuine LR glow plugs fitted. Checked to see if power was being applied and it is. (to one anyway, assuming if one is getting power then they all will)

Within the last 5,000 km. New injector seals, new injector in number one, new injector harness, cleaned head plug.

No oil at the ECU

[nismine01]

An old farmer mate of mines tractor was missing on one cylinder.

Now being a cocky he had different methods to a technician for telling which one was at fault.

He started the tractor from cold in the morning and kept feeling the exhaust branches from the cylinder heads, one was cool to cold while the others were warm to hot. He knew which one to fix.

It's different with the Landy, but if you had the time and wished to put in the effort, top cover off, disconnect one injector at a time till you stop the black smoke.

Now, this need not take a great length of time, one connector off, cover sits back on and start, blows black smoke turn off before the motor has the chance to warm up and go to the next one.

When you think you have the right one, leave the car overnight again to ensure it is 'cold' and try with the suspect injector disconnected to prove the point.

Never know how it might turn out, I know when computers came into cars we (mechanics) all suspected computer related instead of sticking with the old tried and true before going to the computer.

Bear in mind it might be more than one.

Cheers

Mike

[d2dave]

It's different with the Landy, but if you had the time and wished to put in the effort, top cover off, disconnect one injector at a time till you stop the black smoke.

Now, this need not take a great length of time, one connector off, cover sits back on and start, blows black smoke turn off before the motor has the chance to warm up and go to the next one.

When you think you have the right one, leave the car overnight again to ensure it is 'cold' and try with the suspect injector disconnected to prove the point.

Never know how it might turn out, I know when computers came into cars we (mechanics) all suspected computer related instead of sticking with the old tried and true before going to the computer.

Bear in mind it might be more than one.

Cheers

Mike

Thanks Mike. Definitely worth a try. And it does do it when warm, just not as bad, so I could do one after another.

I know it is certainly possible, but it would be a big coincidence from running perfect to more than one injector playing up.

[sierrafery]

If you want to do that test IMO it's easyer to cut the 5 yellow injector command wires near the ECU red plug, use bullet connectors to reconnect them then unplug one wire at a time, according to the trace on the yellow wire you can identify which injector is at fault by the diagram if that's the case... this way even if the injector loom will fail at a point the oil can't reach the red plug cos it drains out at the bullet connector...i did this few years ago just for that oil protection purpose and to be able to connect a power box but since then i've replaced the main harness with new and remapped the ECU then i was too lazy to do the job again but i'm planning to(without the power box off course)

here's a pic with the job, in my ignorance i used spade connectors at that time but i recommend bullets cos they are stronger and make better contact

[d2dave]

If you want to do that test IMO it's easyer to cut the 5 yellow injector command wires near the ECU red plug, use bullet connectors to reconnect them then unplug one wire at a time, according to the trace on the yellow wire you can identify which injector is at fault by the diagram if that's the case... this way even if the injector loom will fail at a point the oil can't reach the red plug cos it drains out at the bullet connector...i did this few years ago just for that oil protection purpose and to be able to connect a power box but since then i've replaced the main harness with new and remapped the ECU then i was too lazy to do the job again but i'm planning to(without the power box off course)

here's a pic with the job, in my ignorance i used spade connectors at that time but i recommend bullets cos they are stronger and make better contact

Great idea. Are your connectors water/moisture resistant?

I would be interested to here other opinions as to whether they reckon it might cause any other problems.

Eg. Bad connection in a wire down the track might cause other problems that become hard to find.

[sierrafery]

I've had that setup for about 2 years and it didnt cause any problem to me even though those connectors were not the best choice, i'd use this kind http://www.ebay.com/itm/50-BLUE-16-14-GAUGE-HEAT-SHRINK-BULLET-CONNECTORS-MARINE-ELECTRICAL-WIRE-SPLCE-/381404424625 if i'd do it again

[d2dave]

Yep they look good. However, I can't see how it would stop oil, as the oil would just pass through the connector.