Fuel filter boost sensor

[saltydog]

On my way back from Namibia and Kalagadi. Gen 4 did swb. Just before crossing from Namibia into Kalagadi the engine warning light comes on( along with the stability control light . Car runs ok but lights come on and go off. Then after a few days car goes into limp mode for a few minutes at Twee Rivieren. I disconnect the battery and reboot Seems better but light still on. Long story short eventually a week later am able to connect to diganostics at UpIngton. They say its the boost sensor on the fuel filter. But dont have one in stock. I need to get to George on my way home so call them. No stock. Can order from Jhb. R2800!!!!!!!! For a tiny plastic sensor? Can this be right?
Made it to Beaufort West travelling at under 100 km/hr. Am hoping to pick up the part on Friday in George.
Anyone with similar experience ? Am I just being naive about the crazy price? Or can I do better?

[peterpot]

Fuel boost sensor????? Not so sure about that.
I can only think they are referring to the sensor that senses the boost pressure in the manifold ie the MAP sensor that is mounted right next to the fuel filter.

If this is the case then I would:
Google Gen4 MAP sensor. It has a rubber pipe and an electrical connection. It is a small sensor.
- check that the fitting on the engine manifold that goes from this MAP sensors pipe onto the inlet manifold is not blocked. Pull the pipe off at the manifold and find something like a stiff piece of thin wire (paper clip etc) to check if the fitting is not blocked. Carbon sometimes blocks it here. Do not use a stick or anything that might break off in the fitting.
- check that the pipe from the manifold to the MAP sensor is not perished or broken (also a common fault).
- That the MAP sensor wire is connected and not damaged.
Let us know.

[saltydog]

Thanks. That is the sensor i am talking about. I will do a check as you suggest and let you know if i find anything.

[saltydog]

Ok I have checked, there is no damage to the tube connecting the sensor and it is not blocked but am unable to probe the s shaped metal tube and then the lower rubber tube that connects to the manefold. I am in the bush and dont have a piece of suitable wire So thats as far as I can get at this stage.
I think I will have to just nurse the vehicle back home.

[peterpot]

The fitting on the manifold that the pipe fits onto is just a hollow fitting. So anything stiff that will not break to move away any carbon ( small cable tie / knitting needle / skewer). Even take the pipe off the sensor, leave the pipe on the fitting on the manifold and blow into the pipe / manifold. It should be clear / free. Fitting an EGR blanking plate will reduce the carbon getting into the manifold. EGR is a anti pollution device that redirects exhaust gases back into the inlet manifold.
Hope you come right.

[saltydog]

I will definitely try that when I get home this weekend. Tx again for the helpWill let you know if I make progress

[saltydog]

I was struggling over The Outeniqua and decided to stop at the Mitsu dealer who had called to say the part had arrived. Fitted it cleared the fault codes and like magic the car was back to normal. So I assume it was not a blockage but a faulty map sensor?
So, an expensive option but back home ok. But now I do want to find out more about the blocking plate.

[Greg_SA]

As far as I can remember... You can just unplug the sensor.

It is the MAP sensor. When it fails it often indicates overboost and outs the car into full limp mode if it is detected a few times.

With it unplugged it will still drive okay (It was like 80% power) and avoids the full limp mode.

[saltydog]

Unplugging is good to know, if it ever happens again. It did go into limp mode a few times but disconnecting the battery seemed to help. Tx for the info.

[peterpot]

Here is comment and pictures on an Ausie forum re the EGR blank. www2.pajeroclub.com.au/forum/showthread.php?t=17519
Be aware though that the Ausie Pajeros are slightly different in their setup in that blanking the EGR is detected by the vehicle ECU and puts up some warning signs.
Our vehicles are setup differently and you can blank without any problems with the ECU picking it up. The easiest way is to remove the tin gasket and use it as a template to make the blanking plate. The blanking plate is obviously without the large centre hole and simply prevents the flow of exhaust gas and carbon from entering your inlet manifold. The ECU continues to open and close the EGR valve without detecting that the system is "neutralised".