Thread: D2 and MAF - Mass Air Flow Sensor

The sensor in the airbox is the ambient air sensor, it is an input into the ECU for incoming air temperature/ pressure.

JC

That makes sense I guess - the MAF in the V8s does temp as well...thats the data that goes to the scanguages etc

Hi just wondering how long after replacement of MAF should you notice the difference in performance?

If we are talking TD5, then theres no real "Loss" or performance when it dies, only a little bit when going up looooooong steep climbs, but not much if im honest. The same goes for the MPG, I had not really noticed it had dropped, but def noticed it had gone back up again once the new one was on and fitted.

The thing is, if its dead, replace it and check its working and then you have peace of mind its all as it should be imo.

The MAF does also "controls" the EGR system, but mine is removed completely, so its not doing anything there anyway.

and if its a V8,, instantly,,,

its V8 duel fuel. Replaced the MAF and it ran worse, was told to let it run for 10klms and see if there was any improvement, there wasnt. So i swapped it back. The trouble is going up hills you really have to put your foot down and it seems to be indecisive on which gear it wants. It sometimes revs out to 4500rpm!! A bit scary dont want to blow the thing up. It was stalling on gas and idling really low so i have had it back to the gas place 3 times. Its no longer stalling but idle still fluctuates between 350-800rpm.
We have tried MAF sensor, new points and leads, transmission service and gas service. Still no clue maybe the catalytic converter???

Originally Posted by ajbdisco2

its V8 duel fuel. Replaced the MAF and it ran worse, was told to let it run for 10klms and see if there was any improvement, there wasnt. So i swapped it back. The trouble is going up hills you really have to put your foot down and it seems to be indecisive on which gear it wants. It sometimes revs out to 4500rpm!! A bit scary dont want to blow the thing up. It was stalling on gas and idling really low so i have had it back to the gas place 3 times. Its no longer stalling but idle still fluctuates between 350-800rpm.
We have tried MAF sensor, new points and leads, transmission service and gas service. Still no clue maybe the catalytic converter???

You need to check your o2 sensors. There are two, they are located on the exhaust and are used by direct injection gas systems to determine the correct mixture of LPG and other timings. When they are faulty on a V8 running on petrol the ECU defaults back to its default settings which are ok for petrol - it runs a bit rich but idles okay and so forth. When the o2 sensors arent working and you have LPG which relies on them, you will get erratic idle and the car wont have as much power or run as smoothly.

You could also check the contacts to the MAF to ensure they are clean and also ensure you are using a genuine MAF - non gen ones dont seem to work as well based on comments from other forum users.

Another thing to check on your car is the idle control valve which is a cylindrical thing located on the top of your inlet manifold with some pipes running into it and then out again, its a magnetically controlled valve which controls the amount of air the car lets into the engine, and if it gets too dirty it can not work correctly and cause issues with idling. When you start your car cold it should idle at 1200rpm for about 30 seconds and then drop to 800-900, if it isnt doing this then look at the idle air contol valve.

Andrew

Originally Posted by ajbdisco2

It sometimes revs out to 4500rpm!!

Does it the world of good,,,

I am "under instructions" to ensure mine see's "over 5" once a month,,,