Running problems

[Jcvan]

Good evening, after finding out what the problem was with the running problem was ( a prv not working correctly ) anew on is now in and the pressure on the rail is ok, the maf sensor is giveing me a problem now, the demand sicks on 327 , could you give me a clue what it might be ? Could it be a cable problem? The maf is new..thanking you John

[Airthies]

Before getting all excited, what IS the problem with the MAF?
Fault code and related explanation.

What demand sticks at 327 what's?

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[Jcvan]

Hi , on the forscan Readings there is maf reading the air flow and the maf demand reading the air flow is working , but the air flow on demand is staying on at a constant 327 thanking you john

[Jcvan]

When reving the engine the air mas flow works but the demanding air works and then bocks and compacates with the air flow

[knobby1]

When reving the engine the air mas flow works but the demanding air works and then bocks and compacates with the air flow

"bocks and compacates"..?? What's that mean..??

Unless the engine is under load, the desired figures won't change much.

Lord Knobrot

[Airthies]

As knobby said, your comment doesn't make sense.
Static revving won't change stuff drastically, under load where it is demanding more air and fuel is where you would really see differences.

If you're worried about airflow restriction, then pop the lid off the air filter box as long as the area and environment are relatively dust free.
Run the engine and see if the readings are different with the air filter both in and out of the system.

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[Jcvan]

Good afternoon I will try that and let you know thanking you john

[Jcvan]

Good afternoon, tryed that but still haveing the same problem and it’s doing my head in , tryed everything possible, like I said I can drive for miles and then stop at set of lights and the revs go up and down, when I drive off the engine bocks and away she goes until a mother set of lights and then nothing , thanking you john

[knobby1]

Good afternoon, tryed that but still haveing the same problem and it’s doing my head in , tryed everything possible, like I said I can drive for miles and then stop at set of lights and the revs go up and down, when I drive off the engine bocks and away she goes until a mother set of lights and then nothing , thanking you john

When were the learns last done.?? MAF sensors rarely fail...it's usually the wiring to/from them not happy. Faulty EGR valves can throw MAF/MAP sensor fault codes.

Lord Knobrot

[Jcvan]

Good morning knobby , the last learns were done at the weekend after putting it all back together , the reading on forscan is saying air sensor 1 is sticking low , thanking you john

[Jcvan]

Good everything knobby1, just put 2 new sensors on the cat and a regenerate and it’s running a dream i would just like to say thanks for all of the tips and info you gave me , thanking you john

[knobby1]

Good everything knobby1, just put 2 new sensors on the cat and a regenerate and it’s running a dream i would just like to say thanks for all of the tips and info you gave me , thanking you john

I'm a bit confused...You talk of 2 new sensors on the CAT, the cats don't have sensors, unless you're talking about DPF..?? If that's the case it's a Euro-5 and they don't have a DPF...unless you have one of the very rare Euro-4's with a DPF. Reading earleir in the thread, it seems you do have one of the very rare Euro-4 DPF machines.

Lord Knobrot

[Jcvan]

Good morning, yes have a dpf euro 4 2010 , well it runs ok now , I just hope it stays that way , thanks for all the help , john

[Jcvan]

Good morning, yes I have a euro 4 2010 van with a dpf it’s running ok now and I hope it stays that way , thanks for all the help , thanking you john