Thread: Strange TD5 Problem that came Back

Hi,
In April I posted a problem with my DII TD5 while heading accross the Nullabour on the way to Melbourne to pick up my new caravan.

When flooring the pedal to overtake the engine would rev to to about 3000 RPM then die, rev again..die and repeat this until you backed off sufficiently for it to rev up.

After two trips to two different landrover dealers who did not locate the problem and a lot of checking the boost, wastegate, injector loom, throttle posion sensor pots, etc. there was no answer.

I noticed after one test run that the Disco had a small fuel leak apparantly coming from the "Fuel Block/Regulator" good name for it, fuel block.

After the fuel block was changed for the leak, apparantly a common problem with TD5 the difference was astounding but when flooring the pedal and hitting 3200 rpm the old problem was still there.

Lots of reading up on TD5 and how the fuel and control systems work together I decided to disconnect the Mass Air Flow meter and take it for a run around the block.. Problem gone. Ordered a new MAF, replaced and problem fixed after 3 months of putting up with the annoying problem.

If anyone is experiencing surging problems with their TD5 try disconnecting the MAF first and take it around the block or a short run to see if the problem dissapears.

DO NOT LEAVE IT DISCONNECTED as this may cause engine and maybe gearbox damage.

Also whilst troubleshooting I found that the plastic loom tube encasing the wires from the air sensors that routes over the air-cond compressor had dried out and fallen to bits allowing the wires to lay on the compressor housing. I replaced the loom tube and tied the loom off the compressor. No doubt the wires would have eventually had the insulation melt down to the point they would be shorting together or to ground.

Also and please correct me if I am wrong about over boost. The ECU does not shut the fuel off until the inlet pressure reaches 225 KPA which is 32 PSI. That's serious inlet manifold pressure. The LR dealers testbook software diagnostics does not fair particually well in diagnosing MAF problems unless the MAF is actually dead.

LR testbook also has a diagnostic for opening the wastegate with the engine running and with a air pressure meter connected to the intercooler inlet pipe take off for the turbo solenoild you can see exactly what is happening in respect to boost.

Sorry to write so long but I hope this helps some one out there with a TD5 surge problem as it annoyed me to hell and back.

Regards,
BradM

MY2003 Disco TD5
TR ECU Remap
Muffler replaced with a Vortex unit

That makes sense. I thought it must use a default set of values.

BradM
03 dII TD5