New MAF = Sloooooooow - MG-Rover.org Forums
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post #1 of 22 (permalink) Old 17-01-2017, 19:14 Thread Starter
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New MAF = Sloooooooow

I was sick of looking at the EML on the Mk2 25 and I need to improve the
MPG, getting 370 on a full tanks, engine has stock injectors and only has
a Dark Ice inlet pipe and a chav filter so I bought a new MAF for it, fitted
it and cleared the fault codes, (Air Intake Temp & Mass Air Flow) but the
car is soooooo sloooooo, guessing that with no MAF fitted/not working
that is fuels its tits off hence the jerky pull off in 1st and instant power
and with the new MAF its learning still but will improve ?

Last edited by ROVER-25X; 17-01-2017 at 19:24.
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post #2 of 22 (permalink) Old 17-01-2017, 19:18
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Unlikely. You probably got a duff maf out of the box - was it a genuine replacement?

Faulty mafs are pretty much the norm for anything non-genuine, thou does happen in any case.

With a dead maf, the ecu will use the limp mode values which apart from high engine speed performance will drive almost normally, a weak maf (which works to a degree that prevents the ecu recognising it as weak) really will strangle the fuelling. I expect from your description that you've transitioned from 'dead maf' to 'weak maf'.

The reason your economy has been poor is likely because the fuelling with limp mode is somewhat fixed, the actual airflow isnt taken into account so you can deliver more fuel than you can actually burn under some circumstances, and the ecu has no way to know.



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post #3 of 22 (permalink) Old 17-01-2017, 19:25 Thread Starter
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Yep, cheap new one from Germany.

Whats the next 'cheap' alternative ?
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post #4 of 22 (permalink) Old 17-01-2017, 19:27
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Yep, cheap new one from Germany.

Whats the next 'cheap' alternative ?
another duff one ?
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post #5 of 22 (permalink) Old 17-01-2017, 19:32 Thread Starter
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Just throw the old one back on in that case but its not a solution.

I need better MPG.
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post #6 of 22 (permalink) Old 17-01-2017, 19:34
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if you want better MPG then refit the standard airbox to start.
then price up some original mafs , you may get lucky and find some cheap ones some where or visit a scrappy and get a couple from their to put on , may be well cheaper and you should get at least one good one .
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post #7 of 22 (permalink) Old 17-01-2017, 19:40 Thread Starter
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Cheapest genuine Bosch I found was 85, I might see if I still have the
MAF off the 400 as I think it worked, the original box was missing I
got the car hence the chav filter that came with it but I could always
throw a spare petrol one on I have.
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post #8 of 22 (permalink) Old 17-01-2017, 19:55
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think that would be your best option , with the air filter box if you have a spare one , but get a couple of mafs from a scrappy and try them gotta be cheaper than buying a new one . if you know how to test them some one may come along and give the reading that will tell you if you have good one or a bad one,,,
cough cough nudge nudge wink wink Dakta .

on a side note have you checked the egr it may need cleaning too as the car hasnt been running correctly and they do block up anyway on diesels i think , never had a diesel so may need some one to come help more with that side of it , but think theirs a few threads on the subject in forums if you do a quick search for it .

Last edited by Andy400; 17-01-2017 at 20:11.
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post #9 of 22 (permalink) Old 17-01-2017, 20:16 Thread Starter
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EGR got a good cleanout 2 years ago, was quite clean to be honest, hardly
and crap inside, doubt it needs another, car is pretty much stock and does
motorway most of the time.

I'll try and did my spare bits out and fit them at work on this weekend, trip
to Dakta has been on the cards for about 187 years lol.
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post #10 of 22 (permalink) Old 17-01-2017, 20:51
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Get saving! I hardly charge the earth and your problem can be 'deleted'.



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post #11 of 22 (permalink) Old 17-01-2017, 21:15
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Get saving! I hardly charge the earth and your problem can be 'deleted'.
omg dakta is a
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post #12 of 22 (permalink) Old 17-01-2017, 21:22
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You're not far from the truth, my assembly is getting nearly as proficient as my English



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post #13 of 22 (permalink) Old 17-01-2017, 21:57 Thread Starter
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Lol sounds like a plan mate, just doing a an extra 7.5 hour shift tonight
so I can polybush my Cabby.
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post #14 of 22 (permalink) Old 18-01-2017, 09:40
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400 MAF is different and so won't work.

As above get and see Dakta to have the issue "deleted"
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post #15 of 22 (permalink) Old 19-01-2017, 18:26 Thread Starter
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Again its a money issue, I have none, bought a house so bills take
precedent, its not only the cost of the services but also the travel
and tunnel toll, just life I guess.

Dug the old maf out the bin, will throw it on at the weekend.
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post #16 of 22 (permalink) Old 19-01-2017, 19:50
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Again its a money issue, I have none, bought a house so bills take
precedent, its not only the cost of the services but also the travel
and tunnel toll, just life I guess.

Dug the old maf out the bin, will throw it on at the weekend.
If the car doesnt run nr normal with the maf completely disconnected its something else.Unplug it and try it.
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post #17 of 22 (permalink) Old 20-01-2017, 01:57 Thread Starter
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Car runs fine with it unplugged, just a bit heavy on fuel.

Got a RoverRon box and a peirberg MAF in the garage somewhere, might have
to did that out but it was butchered by the previous owner.
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post #18 of 22 (permalink) Old 20-01-2017, 21:08 Thread Starter
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Put the old MAF back on, the power is back but the MIL came on after
5 miles so i'll just live with it, going to sort the SRS light next before
the coolant light comes back on and get connect 3 again. :/
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post #19 of 22 (permalink) Old 20-01-2017, 21:50
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is EGR blanked? If so thats the reason. The MAF is now working and so it detects the EGR is blocked and turns the light on.
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post #20 of 22 (permalink) Old 21-01-2017, 20:06 Thread Starter
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Nope stock EGR and it was not even that dirty when I cleaned it a coupld of years ago, will check the fault code again once I get a reader, I found that a MaxiScan works well on the 25, 9.99 too.
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