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Matt
Matt, Mechanical Engineer
Category: Ford
Satisfied Customers: 23975
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a 11 plate Mondeo 163 diesel it jolts and won't pull

Customer Question

I have a 11 plate Mondeo 163 diesel it jolts and won't pull away at over 2000 revs the EM light comes on it sometimes stalls when it's switched on again EM light turns off. The problem used to just jolt under acceleration now it's barley drivable.
Submitted: 9 months ago.
Category: Ford
Expert:  Matt replied 9 months ago.

Hello and welcome to Just Answer

I'd begin by changing the fuel filter as if this partially blocked this will reduce pressure at the main pump

I'd 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.
then check the condition of the air filter and replace if in any doubt

If this is all 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

Expert:  Matt replied 9 months ago.

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Thanks Matt

Expert:  Matt replied 9 months ago.

Hi
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Thanks Matt