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200tdi will only run at idle


stobbie
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Today I have tried to repair my 200tdi wich has developped a problem last year.

The engine will not rev and will only run at idle.

I thought it was the lift pump so I have replaced that, but it did not solve the problem. I've also changed the fuel filter.

I've put a can of diesel directly to the injector pump to make sure there couldn't be any problem with a leak somewhere in the fuel system.

No luck either.

Does this mean my injector pump is broken or could the injectors cause this problem or can a problem in the fuel return line cause a problem?

I have run out of ideas :-(

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if I try to rev it it just doesn't. Revs go up a little bit and then fall back. Sometimes it will rev up to about 3000 rpm for a few seconds and then almost stalls. No smoke.

It are the same symptoms when the lift pump has given up.

I have disconnect the airfilter from the turbo, so the turbo can suck air, didn't help. I don't think the intercooler hoses will collapse because they are pressurised by the turbo.

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if I try to rev it it just doesn't. Revs go up a little bit and then fall back. Sometimes it will rev up to about 3000 rpm for a few seconds and then almost stalls. No smoke.

It are the same symptoms when the lift pump has given up.

I have disconnect the airfilter from the turbo, so the turbo can suck air, didn't help. I don't think the intercooler hoses will collapse because they are pressurised by the turbo.

I had 2 lift pumps go due to a blockage in the pipework on the fuel filter. Just an idea.

Andy

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I had 2 lift pumps go due to a blockage in the pipework on the fuel filter. Just an idea.

Andy

If I feed diesel directly to the injector pump the problem remains the same... So it is not in the pipework.

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the intercooler hoses can still collapse, i would take the top intercooler pipe off and run it then, see if that makes a difference

I have now taken taken of the intercooler hose from the inlet manifold... unfortunately no difference...

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I have now taken taken of the intercooler hose from the inlet manifold... unfortunately no difference...

I had this on a tdi last year, checked all the basics - ending up popping a injector pump on and that was the fault - ran fine after

Lee

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Check the cam belt timing and also check if the filter has the rubber ring on it where it meets the housing And the intercooler hoses as the OP has said

Timing belt has been changed 1500 miles ago. Always ran fine, with the old belt the car has had this problem a few times before, but only for a short period. I'm sure it's not a timing problem.

What happens if you fill the fuel filter bowl and then run it? If it runs OK for a while then dies it would suggest the bowl is not being replenished. That would suggest the lift pump or the pipework from the tank to the bowl. Just an idea.

With a direct diesel feed to the injector pump the problems remains. So it is not in the pipe work.

Can I test the injector pump in some way? Or do I have to take it off and have it tested at a diesel specialist or something?

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I had this exact same problem on an 2.25 and it was the injector pump. Occasionally it would rev up a bit, but not for long. I changed everything before getting the pump checked and that was the problem. The pump needs to be tested by a diesel specialist - due to the high pressures involved in the testing procedure. Last time I had one tested it was over £100.

Les.

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I had this exact same problem on an 2.25 and it was the injector pump. Occasionally it would rev up a bit, but not for long. I changed everything before getting the pump checked and that was the problem. The pump needs to be tested by a diesel specialist - due to the high pressures involved in the testing procedure. Last time I had one tested it was over £100.

Les.

Thanks, I've been working on it again today.. changed the stop solenoid, that seemd to improve things a tiny bit. But it must be the injection pump I think.

Will have to take that off another time, because I don't have time for such a bigger job at this moment :-(

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  • 4 years later...

HAHA 4 years later.. I've taken the old Defender out of the garage to try and repair it again. Only thing I didn't change at that time was the F.I.P..

I have now had it reconditioned and the engine is running fine again!

I've just finished reconditioning a 300 TDI engine (except for the F.I.P) and this one seems to have the same problem, so probably another FIP problem....

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