Help! 540 poor idle and maf issues. - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 11-25-2007, 08:29 AM
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Help! 540 poor idle and maf issues.

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?
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#2 (permalink) Old 11-25-2007, 12:25 PM
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Definitely. It's fairly common for them to die on our cars.



1999 E39 540i/6-VF Stage 1 S/C, Dinan exhaust, Dinan strut+shock braces, Dinan ltwt flywheel + clutch, Dinan Brembo BBK, Dinan monoball, H&R Springs, Koni Yellows, M5 sways, Dinan forged 18" wheels, &c.

1995 E38 740i. Highly modded. Faster than you.

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#3 (permalink) Old 11-25-2007, 03:05 PM
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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.
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#4 (permalink) Old 11-25-2007, 06:20 PM
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it might have been going bad for awhile... but check around other sites you probably can get it cheeper...

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1992 318i Coupe parts car
1992 325i Ls1 swap with a T56 6 speed 12.2 quarter mile
1976 Mercedes Benz 300D with a Ford 5.0L Fuel Injected soon to be Modded
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#5 (permalink) Old 11-26-2007, 01:51 AM
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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.



1999 E39 540i/6-VF Stage 1 S/C, Dinan exhaust, Dinan strut+shock braces, Dinan ltwt flywheel + clutch, Dinan Brembo BBK, Dinan monoball, H&R Springs, Koni Yellows, M5 sways, Dinan forged 18" wheels, &c.

1995 E38 740i. Highly modded. Faster than you.

Sold 2-28-07: 1997 E36 M3/4, 8-30-05 RIP 1997 528i


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#6 (permalink) Old 11-26-2007, 05:27 AM
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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

1991 Ford Taurs SHO 5 Speed White on Tan
1996 Chevy Lumina LTZ Rep 3.4L
1992 318i Coupe parts car
1992 325i Ls1 swap with a T56 6 speed 12.2 quarter mile
1976 Mercedes Benz 300D with a Ford 5.0L Fuel Injected soon to be Modded
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#7 (permalink) Old 11-28-2007, 12:41 PM
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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.
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#8 (permalink) Old 11-28-2007, 01:02 PM
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Smoothly running 540 ftw.



1999 E39 540i/6-VF Stage 1 S/C, Dinan exhaust, Dinan strut+shock braces, Dinan ltwt flywheel + clutch, Dinan Brembo BBK, Dinan monoball, H&R Springs, Koni Yellows, M5 sways, Dinan forged 18" wheels, &c.

1995 E38 740i. Highly modded. Faster than you.

Sold 2-28-07: 1997 E36 M3/4, 8-30-05 RIP 1997 528i


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#9 (permalink) Old 11-28-2007, 04:26 PM
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+1
lol yeah dealer is pricey....

1991 Ford Taurs SHO 5 Speed White on Tan
1996 Chevy Lumina LTZ Rep 3.4L
1992 318i Coupe parts car
1992 325i Ls1 swap with a T56 6 speed 12.2 quarter mile
1976 Mercedes Benz 300D with a Ford 5.0L Fuel Injected soon to be Modded
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