MAP Sensor Cleaning L5P

Crazy Canuck · May 12

Been doing some maintenence (oil, fuel filter, etc) and decided to pull my MAP sensor. Truck has 21,xxxkm (13k miles). It was fairly plugged up. Its simple to remove. I popped the hood, waited an hour to make sure the truck was sleeping, popped the connector off, took out the 10mm bolt, cleaned the soot off with MAF sensor cleaner, let it dry for 30 minutes and reinstalled. Will likely start doing this at every oil change.

Crazy Canuck · May 12

After I cleaned it

asilverblazer · May 12

Can anyone find the GM bulletin that stated the carbon build up was normal and does not affect performance?

I KNOW there used to be one, but can't find it anymore.

Meanwhile, I posted recently about mine having a BUNCH of miles on it and never pulling it, because of the above and no adverse issues otherwise.

I probably will at some point just to see...

PBNB · May 16

I cleaned both of my sensors and installed the banks sensor relocation kit:

The kit takes the sensors out of the soot stream.

newdude · May 19

On 5/11/2026 at 8:37 PM, Crazy Canuck said:

Will likely start doing this at every oil change.

You'd be better off replacing the sensor and getting a MAP spacer.

Seen many at work where the customer tried to clean it only to have it be replaced. Does more harm than good.

Edited May 19 by newdude

asilverblazer · May 19

On 5/12/2026 at 11:58 AM, asilverblazer said:

Can anyone find the GM bulletin that stated the carbon build up was normal and does not affect performance?

I KNOW there used to be one, but can't find it anymore.

No one?

6 hours ago, newdude said:

You'd be better off replacing the sensor and getting a MAP spacer.

Seen many at work where the customer tried to clean it only to have it be replaced. Does more harm than good.

When/if I clean mine, depending on the results, that would be my course of action.