cleaning MAP and other sensors '09 335xi

Hey guys,

I'm thinking that its worth cleaning the MAP sensor and any other sensors that are exposed to dirt and grime and can become dirty with time. I have searched for DIYs and have come up empty, I was wondering if someone could provide a DIY with pics or at least pictures of where the sensors are located, along with a list of the sensors that need/can be cleaned. Thanks!

Any ideas?

http://www.e90post.com/forums/forumdisplay.php?f=16

There are a lot of procedures in the above links.

The MAF Sensor is easy but very fragile.
The other sensors (If it ain't broke don't fix it.)
If you read the Mike Miller schedule he doesn't really say much about cleaning sensors.
And he is the maintenance authority.
The Vanos solenoids are sometimes cleaned to clear up vanos problems.

google Mike Miller BMW

The MAF sensor is the only sensor that is ever really cleaned and you need to be real carful doing that.

From what I have read the n54 engine doesnt have an MAF. I am getting rough cold starts, and would like to clean all my sensors to see if it helps. I have not found any DIY guide on cleaning intake sensors for the n54. Can anyone point me in the right direction?

Originally Posted by ctuna

http://www.e90post.com/forums/forumdisplay.php?f=16

There are a lot of procedures in the above links.

The MAF Sensor is easy but very fragile.
The other sensors (If it ain't broke don't fix it.)
If you read the Mike Miller schedule he doesn't really say much about cleaning sensors.
And he is the maintenance authority.
The Vanos solenoids are sometimes cleaned to clear up vanos problems.

google Mike Miller BMW

Originally Posted by T.O.335

From what I have read the n54 engine doesnt have an MAF. I am getting rough cold starts, and would like to clean all my sensors to see if it helps. I have not found any DIY guide on cleaning intake sensors for the n54. Can anyone point me in the right direction?

Never clean a MAP sensor. Avoid cleaning any other sensor, including your MAF sensor, unless there is an articulable reason for doing so.

Originally Posted by DSXMachina

Never clean a MAP sensor. Avoid cleaning any other sensor, including your MAF sensor, unless there is an articulable reason for doing so.

I have actually been having rough cold start issues, with the engine performing smoothly once it is up to temperature. Experience that I have had with other cars previously is that dirty sensors can be the cause of these types of issues.

Originally Posted by DSXMachina

Never clean a MAP sensor. Avoid cleaning any other sensor, including your MAF sensor, unless there is an articulable reason for doing so.

i see this ending well.....

How many miles on your car?

Just over 85,000 km or 53,000 miles.

The number one cause of rough cold idle* is a dirty throttle body. It's not too hard a job to do on your car. Find a DIY, get a good brush and a can of t b cleaner (Gunk makes a good cleaner). Be careful not to damage the electronic throttle by improperly moving it, and you could solve your problem.
A dirty throttle body virtually never sets a code.
*You did change your plugs already, right? And used BMW plugs?

PS When you start the car after cleaning the tb it will run worse than ever for half a minute. Give it a chance.

Originally Posted by T.O.335

I have actually been having rough cold start issues, with the engine performing smoothly once it is up to temperature. Experience that I have had with other cars previously is that dirty sensors can be the cause of these types of issues.

Long cranks?

Originally Posted by CALWATERBOY

Long cranks?

No long cranks at all, starts right up. I still would like to try to clean sensors if at all possible. I am getting misfire CEL codes but the engine runs wonderfully when warm so I have a feeling its temperature/sensor related.

Originally Posted by T.O.335

No long cranks at all, starts right up. I still would like to try to clean sensors if at all possible. I am getting misfire CEL codes but the engine runs wonderfully when warm so I have a feeling its temperature/sensor related.

Specific & consistent? Have to wonder if one or two cyl's only giving trouble.

Did post 11 register at all with you?

Originally Posted by DSXMachina

Did post 11 register at all with you?

Yes, but....

OP hasn't posted codes or lack of. Hasn't indicated whether problem is with certain cyl's or not, and hasn't said whether he's changed plugs or anything else.

So....

Carboned up intake valves also.

Originally Posted by DSXMachina

Did post 11 register at all with you?

i stand by post 8

Originally Posted by CALWATERBOY

Yes, but....

OP hasn't posted codes or lack of. Hasn't indicated whether problem is with certain cyl's or not, and hasn't said whether he's changed plugs or anything else.

So....

Attachment 349632

Sorry Cal, that was directed at the OP.

Originally Posted by Orient330iNYC

i stand by post 8

I think you'll be proven correct.