308cc (2009) Coolant Loss (internal) & Anti-pollution System Fault

[divettri]

Some drawings that I have acquired. Can someone advise where the MAP sensor actually is as I am a bit confused by it all really.

https://catalogs.ssg.asia/peugeot/?lang ... BwbGllcj09

https://catalogs.ssg.asia/peugeot/?lang ... aWVyPT0%3D

https://catalogs.ssg.asia/peugeot/?lang ... ZNNg%3D%3D

https://catalogs.ssg.asia/peugeot/?lang ... BwbGllcj09

https://catalogs.ssg.asia/peugeot/?lang ... I9PQ%3D%3D

[divettri]

I put a gas detector in the expansion tank. No bubbles, no change in content of vapour space (Oxy 20.9%, 0ppm CO). Does this mean its unlikely to be Head Gasket?

[Arkis]

MAP sensor i no. 12 on this page https://catalogs.ssg.asia/peugeot/?lang ... aWVyPT0%3D

If there is no detection of gases on the expansion tank it's unlikely headgasket problem. It still could be, but it's unlikely. How was the leaking finding going? Any luck finding wet spots around the thermostat or on some coolant lines?

[PaulC5]

With it having a separate boost pressure sensor then maybe it is that at fault and not the MAP sensor. You may be best to check live data from both of them before thinking about buying new ones.

[xantia_v6]

Some of these engines have the hose from the header tank routed between the engine block and RH driveshaft with VERY little clearance, and if the hose rubs on the CV joint it can cause a small (and eventually large) water leak. It is best seen from the side with the RH wheel removed.

[PaulC5]

I had a heater matrix leak on a car and noticed by the coolant burnt curry smell inside the car.

[divettri]

There is a possibility that vehicle is also losing / burning oil. Not dramatically but I topped it up the other day only to 1/4 mark on dipstick & after about 500 miles the low oil warning came back in. Could all this be related? Anybodies advice?

[Arkis]

Minor oil consumption is "tolerable" on these engines. 1 liter per 5000 kms is usually how these engines go when they get some mileage on them. If I remember correctly from minimum to maximum it's around 1,25 litres. So yours is more, but it depends on riding stuly, if it's more like long range or just city riding etc... Do some longer tests. Also keep checking around the engine.

To other members. Does these engine have water/oil heat exchangers like the first ones used to? There was quite commong place for leaking but I think you would see it on the ground dripping from there.

[divettri]

Minor oil consumption is "tolerable" on these engines. 1 liter per 5000 kms is usually how these engines go when they get some mileage on them. If I remember correctly from minimum to maximum it's around 1,25 litres. So yours is more, but it depends on riding stuly, if it's more like long range or just city riding etc... Do some longer tests. Also keep checking around the engine.

To other members. Does these engine have water/oil heat exchangers like the first ones used to? There was quite commong place for leaking but I think you would see it on the ground dripping from there.

Thanks, I will keep an eye on the oil loss.

What is noticeable though is the Anti-pollution system fault warning is now on pretty much all the time. This coupled with the Camshaft / Crankshaft Position correlation & the Turbo underboost warnings. Still not able to determine which sensor is what to check them (MAP, BOOST & Crankshaft / Camshaft)??

[xantia_v6]

I had missed the under boost fault codes. They are interesting because they cannot (as far as I can see) be caused by any fault inside the engine itself. For that reason I think that they are worth investigating.

Does your diagnostic tool give details of the engine conditions when those faults were logged?

Can those faults be triggered on demand?

Is the boost pressure generally lower than the reference value in live data readings?

It would be possible to fit a vacuum gauge to see if the control valve is calling for maximum boost.

[thorter]

I had a water pump once that leaked as a fine mist from the spindle seal, and only when hot and pressurised. It was very difficult to find, with never a trace of water to be seen under normal circumstances.

[divettri]

I had missed the under boost fault codes. They are interesting because they cannot (as far as I can see) be caused by any fault inside the engine itself. For that reason I think that they are worth investigating.

Does your diagnostic tool give details of the engine conditions when those faults were logged?

Can those faults be triggered on demand?

Is the boost pressure generally lower than the reference value in live data readings?

It would be possible to fit a vacuum gauge to see if the control valve is calling for maximum boost.

Unfortunately, I wouldn't know the answers to any of what you say!!

What i did notice (as someone has asked me further up the chain) is whether the MAP reading changes as the accelerator is pressed. The answer is yes it does. At idle, it is about 90(ish) but when accelerator pressed it initially goes up but then drops to around 60(ish).

[divettri]

I had a water pump once that leaked as a fine mist from the spindle seal, and only when hot and pressurised. It was very difficult to find, with never a trace of water to be seen under normal circumstances.

Hmmm interesting. Its been in my local garage (not Peugeot) & what the mechanic found was that there were some hoses that were contracting when the engine was running & this could be causing a restriction in the coolant flow & possibly some boiling off???

[divettri]

I have been told by a mechanic (looking at a separate issue with another of my vehicles) that he has seen this type of fault before (coolant loss / white smoke) which was caused by a faulty EGR Cooler. He did try to explain how to test it by removing a hose & checking for any moisture (spitting) as it should be just air in that hose. The problem, I can't remember which hose he said to disconnect or even where to find this hose.

Can anyone offer any help?

[xantia_v6]

I don't think that the EP6 engines have EGR, so no EGR cooler...