defender tdi300

[Rover mick]

hi all, was hoping someone out there can point me in the right direction. my 94 tdi 300 defender has an intermittent surge or hesitation. i have run alsorts of cleaner stuff through the tank over last 1500 k's or so with minimal improvement.... sometimes its quite jerky and other times not so bad and shows some promise of coming right. but its always there. (ANNOYING) anyone with any ideas as most likely cause? be greatly appreciated. cheers, mick.

[camel_landy]

I haven't got time for a full explanation (sorry) but my money would be on the little mechanism, inside the top of the injector pump, sticking or getting worn.

A drop of oil/grease might help.

It also might be worth checking your timing, condition of timing belt and valve clearances.

M

[justinc]

hi all, was hoping someone out there can point me in the right direction. my 94 tdi 300 defender has an intermittent surge or hesitation. i have run alsorts of cleaner stuff through the tank over last 1500 k's or so with minimal improvement.... sometimes its quite jerky and other times not so bad and shows some promise of coming right. but its always there. (ANNOYING) anyone with any ideas as most likely cause? be greatly appreciated. cheers, mick.

Make sure when draining the sediment bowl (located at rear of lhr wheel arch, next to edge of fuel tank) that you actually remove the bowl, not just drain it by undoing the bottom plastic draincock. I have seen many of them brimming with algae/ bacteria and sludge like jelly and water. This will be even more necessary after running a cleaner throgh the system as any muck in the tank mobilised by it will settle in the sedimenter and filter. Also check that the electrical connection to the injection pump isn't loose. Wiggle it while the engine is running to test that theory :-)

Jc

[Jojo]

Make sure you don't have an air leak in the fuel line somewhere!

[isuzu110]

Could it be your lift pump ? Mine had failed leading the engine to run rough at times

[87County]

Make sure when draining the sediment bowl (located at rear of lhr wheel arch, next to edge of fuel tank) that you actually remove the bowl, not just drain it by undoing the bottom plastic draincock. I have seen many of them brimming with algae/ bacteria and sludge like jelly and water. This will be even more necessary after running a cleaner throgh the system as any muck in the tank mobilised by it will settle in the sedimenter and filter. Also check that the electrical connection to the injection pump isn't loose. Wiggle it while the engine is running to test that theory :-)

Jc

A not-so-obvious one Justin, it has happened here.

Your suggestion could be extended to check all crimped connections in that circuit.

[DeanoH]

Looking from a different angle, perhaps a loose or delaminated intercooler hose ? Worth a look anyway.

Deano

[Rover mick]

cheers deanoh, has new one on mate, tried that one.... appreciate your response with me drama

[Blknight.aus]

can you sling up a list of all the fault finding you have already done?

[Rover mick]

chcked fuel lines for possible leaks.
turbo hoses and other air lines.
fuel filter.
leaks around fuel pump and injectors etc.
haven't pulled off injectors or pulled pump off.
have run copious amounts of fuel/injector cleaner through, sometimes i'll get a good run for a couple of minutes as a torment. also fuel economy hasn't been much if any different and doesn't blow excessive smoke........