Kagaroo @ 2000 rpm

C3 Pluriel 1.4 engine code tu3jp mileage 47500

Hi guys, this car will not accelerate over around 2000 rpm and then it "loses the plot". no diagnostic codes present or engine management light! driving it, it feels like the MAP sensor is faulty but that has been replaced along with the crankshaft sensor. does any one know what i should be seeing on " live data" in respect of MAP sensor reading? For example, at idle, data suggests 640mb @ 800 rpm though my scanner shows a reference of 1306mb.

I understand that I should have two throttle track readings and would expect them to be similar. There is no reading at all from track one??

Are there common issues with the ECU that could account for this? Why no fault codes at all? mechanically, there seems nothing wrong, no obvious vacuum leaks, runs perfectly at idle. only under load does it play up.

Thoughts?

Hello davidanderson, welcome to the forum

davidanderson wrote: it feels like the MAP sensor is faulty but that has been replaced along with the crankshaft sensor.

I may be able to get some live data from a Petrol C3, I will report back if I can find a suitable petrol C3 near by

davidanderson wrote:I understand that I should have two throttle track readings and would expect them to be similar.

I think they are an inverse of each other, or something similar. The ECU will read both values and give out a reading. You will definitely get an P code error if the 2 throttle pedal tracks don't correspond.

davidanderson wrote:Why no fault codes at all?

Its a mystery and very unusual for a car that has problems, hey even cars that run well can have codes stored. I would recommend the use of lexia clone tool when it comes to reading codes on the C3

davidanderson wrote:only under load does it play up.

When the engine is trying its hardest and using the most fuel and air - Coil Packs, plugs, fuel filter and air filter - all ok?

I may be able to get some live data from a Petrol C3, I will report back if I can find a suitable petrol C3 near by

Engine idling manifold pressure.

I started the engine which has been previously run an hour or two ago and captured this

Then I did a run around the block, drive to the corner, up the hill in second to about 3200RPM, around the corner and down the hill in second under engine braking then around the corner and park. I blipped the throttle just towards the end of the idling.