Help! 540 poor idle and maf issues.

[yrshaik]

I recently changed my 528 for a '98 540. The car performed perfectly until 2 weeks ago when the car occasionaly stalled when comming to a stop. A few days later it did not idle at all. I cleaned out the icv and all seemed well again except for an occasional hesitation when accellarating hard. But idle fault is back! The car now peforms better when maf is unplugged! The car picks up speed like it never did. But occasional poor idle. Could the maf be faulty?

[Teh Prof]

Definitely. It's fairly common for them to die on our cars.

[yrshaik]

Thanks for the response.
I removed the maf a little while ago and attempted to clean it with a cotton swab and a little piece of the "hot film" came away! It's definately destroyed now.

I did querry the price of a maf at a local dealer (Pretoria, South Africa) earlier this week and was glad that I was sitting down at the time! Almost R4000-00!
It's going to hurt my wallet for sure!

But I can't understand why the car performs so much better with the maf unplugged. It's a real beast now.

[AlpineSixAndSeven]

it might have been going bad for awhile... but check around other sites you probably can get it cheeper...

[Teh Prof]

I think there are also a couple of MAF's that are compatible by other manufacturers...someone's going to have to chime in on this one.

[AlpineSixAndSeven]

chime!
Range Rover!!! here !
I had P0171 (Sys 2 Lean Bk1) code and intermittant SES
it is the same part... only like $124
here is a testing thing but dont think you need it...
MAF resistance research from 750iL with info on E38 MAFs

[yrshaik]

Thanks for all the support during this trying time. I've bitten the bullet and bought the maf at the ridiculous price as I'm very attached to my 540 and couldn't wait. Car runs perfectly now.

[Teh Prof]

Smoothly running 540 ftw.

[AlpineSixAndSeven]

+1
lol yeah dealer is pricey....