Vehicle & Technical > Discovery

HELP on a 300 tdi discovery needed

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Nick154:
Has anyone got the computer system to find the fault codes, check the maf sensor and the fueling as my brother is banging his head against a brick wall at the mo.

It's a P plate 300tdi and it has no power and gets alot less the higher the revs go, it also hesitates on acceleration and under load (ie going up hills).

So far we have changed the following:

Fuel up lift pump
de cated the exhaust
changed the gear box oil and filter
fuel filter
air filter
engine oil
cleaned out the inter cooled and cleaned out the pipes
egr blanking plate on

All to no avail

We are in stevenage in Hertfordshire.

if someone has got a maf sensor we could try we would be very grateful as it would add another thing to the tryed list.

Thanks in advance

Nick

Nick154:
oh yeah forgot to mention, he's also getting very low mileage to a tank of fuel (about 240 miles to £90) which is about the same as my V8 he's not very happy!!!!!

Porny:
P reg...

Is it an Auto??

If not, sure it's got a MAF sensor, as only the late 300Tdis Auto's were ECU controlled... and thus have the MAF sensor.

Any other 300Tdi is mechanically controlled and thus have no sensors, ECU or any form of diagnostics....  post 1996 will have a OBD11 port, but this is only for the 10AS alarm unit and the ABS (except on late Auto's - OBD will also be for the ECU)

There a few things that could be wrong for it to be down on power  :wink:


Ian

landandy:
sounds like injector pump to me. had mine rebuilt about £250. First thought it was fuel filters but it had to be the big one lol

Budgie:
If it's a manual then look for splits and delamination on the intercooler hoses, this involves removing the hoses and looking inside as well as an external inspection. This may also produce black smoke from the exhaust as there will be less air to mix with the fuel.

Also the injector pump diaphram may have split which won't be taking the engine to full fuel, no black smoke from the exhaust.

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