map sensor

kenny's 370z · 11-04-2012, 12:47 PM

update;i decided to take the map back out and have a good look inside this time.sprayed some maf cleaner in it and took a tooth pick and pulled out some cotton.im guessing the previous owner had used a cotton swab to clean it

..upon further inspection,that greyish material turned out to be some excessive adhesive from when they manufactured it im guessing.

i had a really hard time getting that out off the metal piece that is responsible for the reading to the ecu.anyway,put it back in and plugged it up.i have increased power now down low that i have never had since owning the car.looks like a new one is in the works and thats the problem.what i did, fixed it 98%.

Jordo! · 11-04-2012, 04:48 PM

Quote:

Originally Posted by kenny's 370z

update;i decided to take the map back out and have a good look inside this time.sprayed some maf cleaner in it and took a tooth pick and pulled out some cotton.im guessing the previous owner had used a cotton swab to clean it

..upon further inspection,that greyish material turned out to be some excessive adhesive from when they manufactured it im guessing.

i had a really hard time getting that out off the metal piece that is responsible for the reading to the ecu.anyway,put it back in and plugged it up.i have increased power now down low that i have never had since owning the car.looks like a new one is in the works and thats the problem.what i did, fixed it 98%.

Glad you resolved that. I'd definitely like to learn more about how the MAP factors into the ECU's fueling (and spark and VVEL?) targets.

kenny's 370z · 11-04-2012, 08:01 PM

Quote:

Originally Posted by Jordo!

Glad you resolved that. I'd definitely like to learn more about how the MAP factors into the ECU's fueling (and spark and VVEL?) targets.

it can definitely play a factor in throttle delay or bogging on this car.had me thinking it was coolant temps causing my problems. it still seemed faster with it unplugged on the top end but ill know more after i install a new one and give the ecu time to adapt.

juld0zer · 08-27-2014, 11:48 AM

Jordo - have you had any luck resolving your random lagging issue?

i'm literally picking at straws at the moment. eyes going crosseyed from analysing datalogs for anything unusual.

what brought me here is i notice in my lagging logs, VACUUM sensor reading seems to hover between 0.9v - 1.1v and this is including foot to the floor.

thing is, i think the vacuum sensor is the brake booster sensor so i'd expect it to be stable-ish

Jordo! · 08-27-2014, 04:40 PM

Quote:

Originally Posted by juld0zer

Jordo - have you had any luck resolving your random lagging issue?

i'm literally picking at straws at the moment. eyes going crosseyed from analysing datalogs for anything unusual.

what brought me here is i notice in my lagging logs, VACUUM sensor reading seems to hover between 0.9v - 1.1v and this is including foot to the floor.

thing is, i think the vacuum sensor is the brake booster sensor so i'd expect it to be stable-ish

Do you mean the OP? It was his MAP sensor.

My most recent issue was a bad primary O2, but it was causing stumbling at idle and poor MPG, not lagging.

juld0zer · 11-11-2014, 08:40 PM

Kenny, can i confirm that it was the sensor on top of the intake manifold that you disconnected?

Did you end up replacing the sensor? How does the car behave now?

nis350 · 11-12-2014, 12:52 AM

Quote:

Originally Posted by kenny's 370z

update;i decided to take the map back out and have a good look inside this time.sprayed some maf cleaner in it and took a tooth pick and pulled out some cotton.im guessing the previous owner had used a cotton swab to clean it

..upon further inspection,that greyish material turned out to be some excessive adhesive from when they manufactured it im guessing.

i had a really hard time getting that out off the metal piece that is responsible for the reading to the ecu.anyway,put it back in and plugged it up.i have increased power now down low that i have never had since owning the car.looks like a new one is in the works and thats the problem.what i did, fixed it 98%.

MAF sensors get dirty especially with oily air filters over time. I would only spray/clean it with MAF cleaner without touch it with anything.

The e46 M3 also uses MAF sensor and many owners experienced better performance after cleaning it.

mike12002us · 11-12-2014, 11:57 AM

Did it throw any codes? with and without the map sensor?

juld0zer · 11-12-2014, 04:23 PM

disconnecting MAP or brake booster sensor for me did not illuminate the CEL or trigger limp mode.

i scanned it using my scangauge and found that pending codes were stored.

11-04-2012, 12:47 PM	#1 (permalink)
kenny's 370z Base Member Join Date: Jun 2012 Location: TN Age: 59 Posts: 243 Drives: 2012 frontier sv v6 Rep Power: 13	update;i decided to take the map back out and have a good look inside this time.sprayed some maf cleaner in it and took a tooth pick and pulled out some cotton.im guessing the previous owner had used a cotton swab to clean it ..upon further inspection,that greyish material turned out to be some excessive adhesive from when they manufactured it im guessing. i had a really hard time getting that out off the metal piece that is responsible for the reading to the ecu.anyway,put it back in and plugged it up.i have increased power now down low that i have never had since owning the car.looks like a new one is in the works and thats the problem.what i did, fixed it 98%. Last edited by kenny's 370z; 11-04-2012 at 02:06 PM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Viper Security System/Tilt sensor/Proximity sensor	kfull	Nissan 370Z General Discussions	4	04-27-2012 12:10 AM
ABS sensor	reamy	Wanted	1	03-30-2012 10:32 AM
Abs sensor	Axelsc1	Brakes & Suspension	7	02-10-2012 12:10 PM
Need help o2 sensor	dinobino	Intake/Exhaust	2	10-15-2010 12:59 PM
WTB: oem AFR sensor	DJ_TJ	Wanted	9	01-18-2010 04:46 PM

08-27-2014, 11:48 AM	#4 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 139	Jordo - have you had any luck resolving your random lagging issue? i'm literally picking at straws at the moment. eyes going crosseyed from analysing datalogs for anything unusual. what brought me here is i notice in my lagging logs, VACUUM sensor reading seems to hover between 0.9v - 1.1v and this is including foot to the floor. thing is, i think the vacuum sensor is the brake booster sensor so i'd expect it to be stable-ish

11-11-2014, 08:40 PM	#6 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 139	Kenny, can i confirm that it was the sensor on top of the intake manifold that you disconnected? Did you end up replacing the sensor? How does the car behave now?

11-12-2014, 11:57 AM	#8 (permalink)
mike12002us Base Member Join Date: Nov 2012 Location: Charleston, SC Age: 40 Posts: 189 Drives: 2010 Sport 370z 6mt Rep Power: 13	Did it throw any codes? with and without the map sensor?

11-12-2014, 04:23 PM	#9 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 139	disconnecting MAP or brake booster sensor for me did not illuminate the CEL or trigger limp mode. i scanned it using my scangauge and found that pending codes were stored.