Weird MAF sensor fault

Rubberknees · Jun 29, 2020

I have a 2000 dhse . About 3 years ago had a fault where going up hill would loose power and struggle, cut a long story short when Maf disconnected problem solved. Hence replaced Maf.
Anyway last week same thing happened so disconnected Maf straight away problem solved, plug Maf in problem back. I thought the Maf wasn't supposed to affect the power like this? Is it anything to do with the fact I changed my engine to a pre EGR on when it let go?
Rangie is running fine now but it is a puzzler

wammers · Jun 29, 2020

Rubberknees said:
I have a 2000 dhse . About 3 years ago had a fault where going up hill would loose power and struggle, cut a long story short when Maf disconnected problem solved. Hence replaced Maf.
Anyway last week same thing happened so disconnected Maf straight away problem solved, plug Maf in problem back. I thought the Maf wasn't supposed to affect the power like this? Is it anything to do with the fact I changed my engine to a pre EGR on when it let go?
Rangie is running fine now but it is a puzzler

Whilst the MAF has nothing to do with fueling a faulty one can cause the ECU to become confused and cause problems.

Rubberknees · Jun 29, 2020

wammers said:
Whilst the MAF has nothing to do with fueling a faulty one can cause the ECU to become confused and cause problems.

Cheers Wammers I think you have mentioned it before. Is it worth buying another Maf or leaving it as seems to run fine just unplugged

wammers · Jun 29, 2020

Rubberknees said:
Cheers Wammers I think you have mentioned it before. Is it worth buying another Maf or leaving it as seems to run fine just unplugged

Up to you, MAF is only for measuring exhaust gas ingestion when EGR is working. If you disconnect it even when it is working fine all you will get on Nanocom is airflow error. How the engine runs should not change.

Rubberknees · Jun 29, 2020

wammers said:
Up to you, MAF is only for measuring exhaust gas ingestion when EGR is working. If you disconnect it even when it is working fine all you will get on Nanocom is airflow error. How the engine runs should not change.

Cheers that's what it shows, air flow error. Will save myself £50 and spend it on something else

wammers · Jun 29, 2020

Rubberknees said:
Cheers that's what it shows, air flow error. Will save myself £50 and spend it on something else

Most will be Chinky copies anyway. They carry a line warranty. It runs out as the truck passes the line between the factory gates.

Rubberknees · Jun 29, 2020

wammers said:
Most will be Chinky copies anyway. They carry a line warranty. It runs out as the truck passes the line between the factory gates.

Dead right. The one on now only been on 21/2 years, so not very good
Stay safe Wammers

Datatek · Jun 29, 2020

Rubberknees said:
Cheers that's what it shows, air flow error. Will save myself £50 and spend it on something else

If you do brim to brim checks, you will likely find that there is a small increase in fuel consumption, may also fail the MOT, it certainly would over here.

RangeRoller dt · Jun 29, 2020

@Mark Piercy had run around trying MAF plugging/unplugging
think in end he had to bite the bullet get genuine

Mark Piercy · Jun 29, 2020

RangeRoller dt said:
@Mark Piercy had run around trying MAF plugging/unplugging
think in end he had to bite the bullet get genuine

Luckily I had a Vauxhall omega bmw airflow meter. It's 20yrs old and still does its job. A pierburg model. I would have liked a new one but not just yet..

I did have to buy a Bosch injector n°4. THAT WAS NEW. 300€ neeeew

Rubberknees · Jun 29, 2020

Datatek said:
If you do brim to brim checks, you will likely find that there is a small increase in fuel consumption, may also fail the MOT, it certainly would over here.

Got a guy up road from me who breaks RR. Going to see him Wednesday to use his Nanocom so will see if he has one

Datatek · Jun 30, 2020

Mark Piercy said:
Luckily I had a Vauxhall omega bmw airflow meter. It's 20yrs old and still does its job. A pierburg model. I would have liked a new one but not just yet..
I did have to buy a Bosch injector n°4. THAT WAS NEW. 300€ neeeew

The Pierburg hot film MAF is very reliable, proably more reliable than a Chinese copy sold as OEM

Datatek · Jun 30, 2020

Rubberknees said:
Got a guy up road from me who breaks RR. Going to see him Wednesday to use his Nanocom so will see if he has one

Secondhand is the way I would go.

wammers · Jun 30, 2020

Rubberknees said:
I have a 2000 dhse . About 3 years ago had a fault where going up hill would loose power and struggle, cut a long story short when Maf disconnected problem solved. Hence replaced Maf.
Anyway last week same thing happened so disconnected Maf straight away problem solved, plug Maf in problem back. I thought the Maf wasn't supposed to affect the power like this? Is it anything to do with the fact I changed my engine to a pre EGR on when it let go?
Rangie is running fine now but it is a puzzler

So you changed your engine to one with an alloy manifold is that correct?

RangeRoller dt · Jun 30, 2020

Just head probably

wammers · Jun 30, 2020

RangeRoller dt said:
Just head probably

Thanks but i need to know exactly what he has done.

RangeRoller dt · Jun 30, 2020

All I can find is this

Rubberknees said:
Your welcome been there got the t shirt. I screwed up big time and had to replace engine so feel for you

wammers · Jun 30, 2020

RangeRoller dt said:
All I can find is this

Sure he will let us know in due time. I am not one for speculation i need to know exactly what he has done to the car.

Rubberknees · Jun 30, 2020

wammers said:
So you changed your engine to one with an alloy manifold is that correct?

No full engine. Bought a complete 97 plate P38 of a friend and swapped engine over ( well local indy did for me)

wammers · Jun 30, 2020

Rubberknees said:
No full engine. Bought a complete 97 plate P38 of a friend and swapped engine over ( well local indy did for me)

So alloy manifold no EGR connections to exhaust manifold and no EGR valve. You are running same ECU but no EGR valve and no IAT sensor under manifold connected.

Weird MAF sensor fault

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