406 hdi 90hp fuel problem

Only doing 31mpg on long runs. Noisy tappetty sound from engine between
2K - 3K revs then disappears. New cambelt fitted but doing this before the
change.

Garage says ECU could be overfuelling the injectors at this rev range and
this is why the tappetty sound and the fuel problems. Garage suggested they
download something to ECU but need this month's disk to do it as disk on
computer is out of date. Garage says that download might fix over fuelling!

Would this be correct?
How much are injectors for the HDI 90 in the UK?

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Thanks.

 

You don't want to know.

For 1.4 hdi they are 500 EUR each (over here, it won't be much difference
in the UK).
For comparison, new turbo is around 1600 EUR , but it can be renewed for
just a fraction of the cost. Injectors can't.

 

Hi ML,

My 306 90Hdi makes the same noisey tappety sound between 2k and 3k, but only
when under heavy load (ie up hills, towing the trailer etc).
I was wondering if it could be waste-gate related. Please let me know how
you get on with resolving this problem, cos it is a major concern for me!

(ed at westicles dot net) Any chance you could drop me an e-mail, then I can
remember to ask you again in a month or two!!

Cheers,
Ed

 

Hello,

It may be correct, as the pump is electronically controlled.
Does it happen under heavy load, light load, or at any load ?

I don't know, but here I've heard of about 250EUR exc. VAT (each) in 2000.

 

Thanks for replying.

It is most noticeable under heavy load. I have noticed another couple of
things tonight.

1. When accelerating hard and taking my foot of the accelerator, the car
does not want to brake but seems to want to run on as if it is still getting
Diesel, which is quite scary when I want to brake hard and the car wants to
keep going.
2. I put the passenger window down and the tappetty noise seems to be more
prominent from the left (passsenger) side.



Thanks again.

 

Hello,

Perhaps it's just a feeling, and just has something to do with turbo or
electronic throttle lag. Or an air intake into fuel circuit, but I guess it
would have stopped the engine : HDis are so sensitive.

Sorry, no more clues.