running rough

Cachris · Jul 16th, 2019, 09:53

My car 2000 V 70 is running rough and I’m not sure why. With the car up to temp the computer is showing open loop and running like crap. If I unplug the MAF the car goes to closed loop and runs better but not great I have cleaned the MAF sensor no change. any thoughts ?

Georgeandkira · Jul 16th, 2019, 11:48

Engine type, mileage?
Any codes?

cheshired5 · Jul 16th, 2019, 12:05

Quote:

Originally Posted by Cachris

With the car up to temp the computer is showing open loop and running like crap. If I unplug the MAF the car goes to closed loop and runs better

I don't know what this means.....

If you have a computer, what is the MAF airflow data at idle, 1k,2k,3k and 4k revs?

Cachris · Jul 16th, 2019, 12:10

No codes, I think about 117000 and 2.4L Petrol

Cachris · Jul 16th, 2019, 12:21

I don't know what this means.....

I think it has to do with the oxygen sensor and if I understand correctly, the car should be in closed loop status when the car is up to temp.

If you have a computer, what is the MAF airflow data at idle, 1k,2k,3k and 4k revs?

Not sure on this I will check when I get home tonight.

Cachris · Jul 16th, 2019, 12:28

Also I should add, at driving speed the car runs fine. It is at Idle where the problem shows itself.

Thanks

SwissXC90 · Jul 16th, 2019, 13:49

Look for intake system leaks and vacuum leaks

Cachris · Jul 16th, 2019, 14:00

Quote:

Originally Posted by SwissXC90

Look for intake system leaks and vacuum leaks

I did a quick look when I was messing with the MAF. Nothing jumped out at me, I will take a closer look tonight.

Cachris · Jul 16th, 2019, 18:49

Gave a closer look nothing seems off, vacuum lines seem to be ok.
Got a check engine light this time for cylinder misfires after clearing the code the car ran rougher.

Here is the info from the scanner. The scale is not right, RPMS go from 800 to about 4000 then back to 800

Cachris · Jul 16th, 2019, 19:02

Quote:

Originally Posted by Cachris

If you have a computer, what is the MAF airflow data at idle, 1k,2k,3k and 4k revs?

RPM MAF
idle 711 7.75
1k 1114 10.95
2k 2014 11.98
3k 3012 35.64
4k 3858 57.09

Jul 16th, 2019, 09:53	#1
Cachris Junior Member Last Online: Sep 23rd, 2019 07:39 Join Date: Aug 2018 Location: Wereham	running rough My car 2000 V 70 is running rough and I’m not sure why. With the car up to temp the computer is showing open loop and running like crap. If I unplug the MAF the car goes to closed loop and runs better but not great I have cleaned the MAF sensor no change. any thoughts ?

Jul 16th, 2019, 12:28	#6
Cachris Junior Member Last Online: Sep 23rd, 2019 07:39 Join Date: Aug 2018 Location: Wereham	Also I should add, at driving speed the car runs fine. It is at Idle where the problem shows itself. Thanks Last edited by Cachris; Jul 16th, 2019 at 12:33.

Jul 16th, 2019, 13:49	#7
SwissXC90 Premier Member Last Online: Mar 20th, 2024 18:26 Join Date: Jan 2016 Location: Cross Country	Look for intake system leaks and vacuum leaks __________________ XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.

Jul 16th, 2019, 18:49	#9
Cachris Junior Member Last Online: Sep 23rd, 2019 07:39 Join Date: Aug 2018 Location: Wereham	Gave a closer look nothing seems off, vacuum lines seem to be ok. Got a check engine light this time for cylinder misfires after clearing the code the car ran rougher. Here is the info from the scanner. The scale is not right, RPMS go from 800 to about 4000 then back to 800 Last edited by Cachris; Jul 16th, 2019 at 18:56.

Jul 16th, 2019, 11:48	#2
Georgeandkira Premier Member Last Online: Today 13:03 Join Date: Feb 2009 Location: Hackensack	Engine type, mileage? Any codes?

Jul 16th, 2019, 12:10	#4
Cachris Junior Member Last Online: Sep 23rd, 2019 07:39 Join Date: Aug 2018 Location: Wereham	No codes, I think about 117000 and 2.4L Petrol

Jul 16th, 2019, 12:21	#5
Cachris Junior Member Last Online: Sep 23rd, 2019 07:39 Join Date: Aug 2018 Location: Wereham	I don't know what this means..... I think it has to do with the oxygen sensor and if I understand correctly, the car should be in closed loop status when the car is up to temp. If you have a computer, what is the MAF airflow data at idle, 1k,2k,3k and 4k revs? Not sure on this I will check when I get home tonight.

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