Thread: Rough running Disco 2a Td5

Sounds like oil in the injector harness. Checking the ECU end is only the worst case. Check the plug on the rocker cover for oil and take the harness out from under there and give it good wash in contact cleaner or something. After that start looking elsewhere if its still misbehaving.

Hi Franz
Before you drive it any further check the oil in the sump to see if its higher than normal and mixed with diesel.You may have a failed injector seal leaking diesel at high pressure into the piston.The motor can run on its own fumes and self destruct without you being able to shut it down.If you know anybody with a nanocom,it should be able to detect an injector behaving erratically.
Running rough is usually a sign of oil in the harness as Derek stated,check the connector at the LH front of the head,BE CAREFULL NOT TO SNAP THE PLASTIC CLIP,I DID
Goodluck

check the harness (as mentioned)
check the oil for dieso (as mentioned)
if none of that gives you any joy you may need to check the injector harness itself incase one of the plugs comes loose. if in doubt remove and refit all the harness related plugs.

Franz

Good to see you got home OK.

I had this sympton & it was the turbo relief valve - I stand corrected for the incorrect terminology.

From memory it was a cheap fix.

By the way I gave your hand held to Simon.

Regards

Chuck

Thanks Chuck.

Originally Posted by LandyAndy

Hi Franz
Before you drive it any further check the oil in the sump to see if its higher than normal and mixed with diesel.You may have a failed injector seal leaking diesel at high pressure into the piston.The motor can run on its own fumes and self destruct without you being able to shut it down.If you know anybody with a nanocom,it should be able to detect an injector behaving erratically.
Running rough is usually a sign of oil in the harness as Derek stated,check the connector at the LH front of the head,BE CAREFULL NOT TO SNAP THE PLASTIC CLIP,I DID
Goodluck

Thanks Landy Andy.

I did check the oil and it was at the right level. How would one determine if there was fuel in the oil - smell test?

Cheers,

Franz

Thanks for all the suggestions.

OK, just checked the oil - it's about a half a centimetre above the full line on the dipstick. It's still dark in colour and the sniff test dide not reveal any diesel smell. Is there another way of checking for diesel contamination?

I'll check the loom plug under the rocker cover later.

Cheers,

Franz

Hi Franz
2 ways to check.
Nanocom should pick up that 1 injector is missbehaving,as it shows the balance between all 5,one will be trying to inject heaps more diesel if it isnt sealing against the head.See if anybody nearby can plug their Nanocom in for you if you dont have one.
BlkNiteAus once posted another check to see if an injector seal had failed.It involved filling the fuel tank to the brim and running it with the cap off and watching for air bubbles at the filler neck.If a seal has failed the motor will force combustion gasses into the fuel system the same way a failed head gasket puts combustion gasses into the coolant.Send a PM to Dave for further advice.
At least if its an injector seal its a cheap fix.
Frenchie had another problem with his,the head had cracked allowing diesel to fill the sump,his had been overheated whilst towing.
GOODLUCK
Andrew