Re: Mondeo TDCi - breakdown


"Moray Cuthill" <moray_dot_cuthill@xxxxxxxxx> wrote in message
news:4307829c@xxxxxxxxxxxxxxxxxxxx
>
> "Andy Evans" <andy@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> news:de7j2f$svh$1@xxxxxxxxxxxxxxxxxxxxxx
>> Hi,
>>
>> I broke down this morning on the M6 around J19/18, complete with young
>> family - not very pleasant, but at least the tow truck arrived pretty
>> quickly.
>>
>> Does anybody have any idea of what's actually wrong with my car -
>> description below:
>>
>> I'd been driving along at the speed limit for a while before the traffic
>> slowed to a stop. When it started again I managed to stall. I re-heated
>> the
>> glow plugs and fired up, but found myself with very little power. I
>> struggled to get to 45 ish in third and then noticed the temperature
>> gauge
>> was at the very highest point. All this occurred within the space of a
>> minute or so. I find it hard to believe that I didn't notice the gauge
>> rising prior to stalling, but I might have missed it. I can't help
>> thinking
>> that stalling had triggered it.
>>
>> I pulled over and stopped the engine and tried re-starting just in case
>> it
>> was some sort of funny ECU thing. The gauge still read very high and the
>> engine again lacked power.
>>
>> Having called for help and waited for 5-10minutes, I tried the engine
>> again - this time the gauge read normal and power seemed to have
>> returned.
>> Having been towed home, the car seems to be ok.
>>
>> Car is 52 plate Mondeo TDCI 130 LX.
>
> The lack of power would be caused by the high temp seen by the ECU.
> These engines go into reduced power mode during overheating.
>
> First thing to establish is whether the engine is actually overheating.
> If it is overheating, then that's the problem.
> If it isn't overheating, then chances are it's a faulty cylinder head
> temperature sensor. This screws directly into the cylinder, and has a
> deformable tip. When you screw them in, the tip off the sensor makes
> contact against the alloy off the cylinder head, and the tip gets
> compressed as it's fully tightened in. These can only ever be fitted once.
> It is mounted on the right hand side (standing at the front looking under
> the bonnet) off the cylinder head, and has a lead coming from it with
> about 6 inches of wire, finishing in a plug. I think you have to remove a
> drive pulley to get proper acess to the actual sensor, but the plug is
> eaily reached.
> These are quite a common failure point, but the ones I've seen have all
> went short circuit, causing the temp gauge to read permanently high, and
> sometimes to cause the ecu to stop the engine. It may be that yours is
> starting to fail.
> If it does show permanent overheating, easiest temporary fix is to unplug
> it. That way the ecu takes a default temp off around 60deg, which is
> sufficient for normal running.
more than likely
the vast majority of cars now will go into limp home mode, especially if
they have fly by wire throttles
no matter how much you press the pedal, the ecu won't allow the tps to do
anything other than maintain idle
it should (possibly) have an over heating light come on the dash, once this
is extinguished the power delivery returns to normal


.

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