Kia Troubleshooting Questions? Ask a Mechanic
Seems like a lot of g/s coming in from the maf sensor. If you unplug it and run the car is there any improvement either with the car or the scan tool itself? Just seems like the maf sensor isn't reading right with those specs. It's hard to be 100% sure because the service manual is showing the flow in lbs of course.
I am showing the maf should be about .7 lb/m at 800 rpms.
Can you tell me if the st fuel trims change at all with it unplugged?
Also, can you get it up over idle to 2k rpms long enough to get a maf sensor reading?
No problem. Been my experience when both banks are messed up and running lean like this, either there is a timing issue, blocked converter issue or a maf issue. Since you have eliminated the cats and the timing, AND fuel pressure, I tend to lean to the maf sensor.
Ok, I tried to google a way to do the math, but I am not sure it's accurate.
Also, if possible get a reading at about 2k rpms.
The voltage at idle is at the bottom of the scale.
calling for 1300mV-1500mV with 1304 being so close to the bottom it makes me wonder.
Also, .7 is the min at idle on the lb/minute scale they are calling for.
I would clear the fuel trim, unplug the maf sensor and see if you can get some performance out of the engine. Even if you were to put in a new sensor, it would run off the old crappy fuel trims.
I am just saying it might be a viable test for the maf. I do think it's the problem because of it being so close to the bottom of the scale, but this test might prove it.
I do remember that on the fords, but even the newer ones have this kind of behavior due to a bad maf sensor.
Pretty rare the map will cause this type of issue.
What is the voltage of the map at idle? I am showing it should be somewhere around 1308 mV
Monitor the "INTAKE MAP" parameter on scantool.
Possible to check these values, it does show it's off a bit according to kia
- Ignition "ON" & Engine "OFF" : Approx.1010mbar(101kPa, 14.65 psi) ~ 1040mbar(104kPa, 15.08 psi)
- Engine "ON" : Approx.310mbar(31kPa, 4.49 psi) ~ 370mbar(37kPa, 5.37 psi)
Sorry it's not giving me a mv reading other then the one I shared with you.
It looks like ign on engine off is going to be the atmospheric pressre, then engine on and running it should switch to the other numbers. I think you should be able to see them on your scanner.
lol, I do not have an answer for you, but if you unplug it and it's still showing, it would indicate a wiring issue to the maf
The service manual doesn't have any measurement for the g/s with the engine off. Sounds to me like a wiring issue at the maf though.