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Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 22727
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Peugeot Turbo-diesel Hdi - 1999 2L estate - mileage approx.

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Peugeot Turbo-diesel Hdi - 1999 2L estate - mileage approx. 162250
car starts and stops with no problem
idling appears ok although a bit noisy (age issue?)
no nasty smoke emissions - new MOT
turbo does not 'come-in' so does not pull under engine load e.g long hills
this appeared gradually over about fifty miles or so
and then became embarrassing!
garage mechanic has checked sensors and seem to be ok
diagnostic gizmo is coming next week to check electrics
what could be the prognosis?
the rest of the car is in pretty good nick with no bodywork issues

1st consider changing the fuel filter as if this partially blocked this will reduce pressure at the main pump

If OK then also check the connections to the EGR valve, if either the vacuum pipe of electrical connection are damaged / corroded then the EGR can be on all time which certainly will hurt performance. Its also possible that its a fault with the EGR valve so its worth removing the valve and cleaning it out with brake cleaner, if it looks particularly clogged then replace it.

If this is OK then check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issues and its best to have the boost pressure measured actually measured with a boost gauge to check that the turbo is healthy and that the sensor is reading correctly

If its a variable vane turbo (they’ll be an actuator on the turbo body - but not a wastegate) then check its vacuum pipework as above and check the connections to the diaphragm / solenoid valve

Also worth checking that the glow-plug relay is switching off as they can stick on and leave the glow plugs also on - on some cars this can force it into limp home

Also worth considering adding a bottle of injector cleaner into the tank as a clogged injector nozzle will reduce power and give poor combustion - the next stage on from this is to remove all the injectors and have them ultrasonically cleaned and flow checked

Also check all the high pressure hoses post turbo/s for any split hoses or cracked metal pipes, also check the ends of the intercooler as its not unheard of to pop the end caps off under high boost.
Customer: replied 2 years ago.

Thanks for reply

I now have to copy this info off and pass it over to the garage mechanic diplomatically (grandmother sucking eggs?!)

I'll write back after Tuesday's appt.


No problem Jill

good luck
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