Xsara picasso tick over issue

[Huskyxantia]

My old 03 plate 2.0hdi has developed an issue with the tick over/idle, it will almost die/stall and flicking the gas pedal clears it, im wondering if theres an idle control valve playing up

Any ideas,

Its had a new mas air flow sensor as full rev range was being lost.
Thanks in advance.

[RichardW]

Where did the MAF come from? A lot of the cheap ones are gash... No idle control valve on these, although some later versions of the 2.0 HDi had a butterfly valve in the air intake.

[Frank79]

It's more often known as a crankshaft position sensor, and yours is located towards the front of the engine, where the gearbox and engine meet.
Brown - Red and Green - Red two-wire plugs

[Huskyxantia]

That makes sence, it came to me earlier idle control valve is more petrol version, mines diesel silly me....

[Huskyxantia]

Where did the MAF come from? A lot of the cheap ones are gash... No idle control valve on these, although some later versions of the 2.0 HDi had a butterfly valve in the air intake.

Bosch maf , so it should be ok, even though they can go wrong most stuff nowaday seems not to last.

[Huskyxantia]

It's more often known as a crankshaft position sensor, and yours is located towards the front of the engine, where the gearbox and engine meet.
Brown - Red and Green - Red two-wire plugs

Think this could be it, as some time when starting it will not catch , ive had the car now on its 3rd yr and starting it taking a little longer, so crankshaft position sensor is known to do that , gotta get me a new one i guess, thinking back to last November my code reader did pick up on this but as it was running i ignored it .... silly me i guess.

[Huskyxantia]

This morning ive removed the camshaft sensor & crankshaft sensor for multimeter testing results as follows just incase anyone might stumble upon this for reference

Meter set 2k ohms
Crank sensor 464
Cam sensor 772

Thoughts ?

Surely the readings should be 800 or more ?

[Huskyxantia]

So using the car just for a test it ran ok for about 3 miles then pulling to a junction engine went lumpy like it was going to stall.

Got back home unplugged the maf it ran normal ..... 30 seconds later lumpy almost wanting to stall , however there is a sort of high pitch whistle not very loud but sounds like its being sucked instead of blown , my new crank and cam shaft sensors will be with me wednesday so ill see what that does, tomorrow I'm going to check the fuel filter the filter was changed 4 months ago so should be ok but i wont know till i check.

[RichardW]

It won't be the cam sensor as this is only used at start up to check cam/crank are in synch. If this is Siemens injection, there's no lift pump so if it's pulling a vac on the tank it could upset things.

[Huskyxantia]

It won't be the cam sensor as this is only used at start up to check cam/crank are in synch. If this is Siemens injection, there's no lift pump so if it's pulling a vac on the tank it could upset things.

What would the find and fix be ?

[RichardW]

Open the fuel filler when it's playing up and see if it sucks in, and if it improves with the cap open.

[Huskyxantia]

Would this mean anything , there's been a few times the cap has been hard to take off like its glued then after a couple of tugs its come off, still with about a quarter of a tank too.

Happened about a week ago filling up at esso garage

[Hell Razor5543]

That suggests the fuel tank breather is blocked.

[Huskyxantia]

Ok, would that be one of the pipes next to the filler kneck ?
Would road muck be the cause ?

[Huskyxantia]

Just seen a video on youtube same thing they drilled a small hole in the filler cap to stop the vacuum build up