My car has started running really rough recently. Its fine on short distances but after 10-15 mins it starts misfiring and trying to stall. The last time it did it the car died and wouldn't restart so i disconnected the MAS to see if that would get me home (puts it into a sort of safety mode i believe) and the car started and ran, but ran rough below 2000rpm(is that normal?).

 

I presume it is the MAS playing up or could it be something else that is ignored when i disconnect the MAS plug?

 

Also if it is the MAS then its the second one that has gone in 3 years, the last one being a brand new one from nissan. What could be causing them to break? :headvswal

 

Thanks...

do you have an aftermarket air filter? if so, do you still have the splash gaurd in place?

 

Vijay

I have an apexi filter on the car. I don't think the filter has ever had a splash guard on it. I also removed the undertray a few months back after i could no longer attach one to my car after constant speed bump damage!

 

Where abouts does the splash guard go in relation to the aftermarket filter?

Hi stu .

My maf went wrong a few weeks ago,the reading on the conzult showed it was only giving 0.08v untill I taped it lightly then it was fine for a while then go wrong again.

I read a post by mac1 ,he resoldered all accesible joints inside and fixed it so I thought nothing to loose and gave it a go,hey presto its working fine 1000 miles later.

What I would add to mac1s post is that when I opened it up there is a copper shield inside which was bent in so I straghtened it insulated the board inside and rebuilt it

It seemed to me that the shield had been touching some of the pins on the board as

three of them are quite long so I snipped them off while I was in there.

It worked perfectly for me and saved a lot of hard earned,has to be worth a try.

Well i've taken apart and cleaned and resoldered the components twice now and still no joy. From what i can tell its the HA17902PJ quad amplifier thats water damaged, so it looks like i'll have to buy another MAS. Thats 2 second hand and 1 new in 3 years now... I'm also going to get a blitz sus induction kit to replace the soggy apexi filter i have on now so hopefully i won't get the problem again.

 

I was thinking if anybody was able to source a new chip i might have a go at replacing it. I've tried at my work with no joy but if anybody on this forum deals with electronic components and could help please let me know.

 

Thanks.