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Old 04-03-2010, 02:21 PM
TheeDragon TheeDragon is offline
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Location: fl
Join Date: Apr 2010
Posts: 15
Mein Auto: 98 740il
Very very rough idle - then 40 mph limit

each of the past 15 starts, with the engine idle getting very noticeable rougher each time (then would smooth out in 1-2 mins)
then last night - with barely making it to 40mph
so . . . after fearing the worse
(blow engine - whatever)

I read hundreds of posts on multiple forums
and crossed my fingers and bought CRC MAF sensor cleaner
($8 at Auto Discount)
and having no new style torx driver
I removed the entire air cleaner hose
(that holds the MAF Sensor)
and soaked it from both ends
and Ta Dah!
now runs 95% smooth idle and accelerates like a race horse

might still have some misfiring ?? (how can I tell??)
took car to Auto Discount for free code read
and it would not connect?
do OBD II connectors go bad >>>???
Old 04-03-2010, 03:19 PM
7Figurez's Avatar
7Figurez 7Figurez is offline
Officially Welcomed to the 'Fest
Location: Virginia
Join Date: Mar 2008
Posts: 294
Mein Auto: 2005 745I
The OBD II generic scanner can not read all the fault codes stored on the car. Each module of your car stores its own fault codes, i would recomend having the car scanned by someone that has the BMW scanner(GT! or OPS) or a compatible 3rd party scanner such as an AUTOLOGIC device.
Old 04-03-2010, 03:38 PM
TheeDragon TheeDragon is offline
Registered User
Location: fl
Join Date: Apr 2010
Posts: 15
Mein Auto: 98 740il
this is the model scanner they used
Actron CP9175


any reason why this did not work?
Old 04-03-2010, 08:33 PM
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drivinfaster drivinfaster is online now
Officially Welcomed to the 'Fest
Location: in the sticks you piney
Join Date: Nov 2007
Posts: 12,221
Mein Auto: rescued bmw's
that just reads codes, and i believe only for the powertrain. not the best, if you wish to do diy repairs. i suggest searching the forum and see what people suggest and check them out.

there are several types, depending how far you wish to go with this, so educate yourself on the types (scanner vs reader, trace vs dual trace vs no trace) and the benefits/skill set needed to use them.

aside from tool truck units, i have not used anything but oe scan tools myself, so i have a bias toward oe units (if available) or equivilant.

Old 04-04-2010, 03:01 PM
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CodyItaliano CodyItaliano is offline
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Location: Corpus Christi, TX
Join Date: Feb 2009
Posts: 628
Mein Auto: 2001 740i
might want to look into a more permancent solution with a new sensor. i bought one at the dealership for about $375. oembimmerparts.com has it for something like $180.

*Der E38*
manufactured: 7/01
color: anthrecite metallic
wheels: style 89 E66, 19X9F 19X10R
ext. lighting: 8000k D2S & LED plate light
*want to get sport rear diff*

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