2G I replaced the MAF, now what?

[Mitsu_Racing]

I got a CEL and when i checked it with my pocketlogger it was the PO100, Mass Air Flow Volume Circuit. So i replaced the MAF but the CEL PO100 still keeps coming on. What should i check? Replace? Thanks.

 

[DSM90AWD]

Did you reset your ECU after replacing the MAS?
Disconnect the (-) terminal of the battery for ~15minutes and try again.

If still a code, may want to check the wiring harness to the MAS for corrosion / shorts in the wiring. Can clean the contacts with a bit of dielectric tuneup grease (with the battery disconnected of course)

 

[emcee]

I replaced my MAF and left the battery disconnected for 30 min. however now the car won't idle properly. It seems to run fine when on the street, but when I stop at a red light it has low bouncing idle and after less than a minute of struggling will cut out. Any suggestions? Thx.

BTW, the car was totally fine before, just started a P1070 CEL code hence the replacement of MAF.

 

[pauleyman]

Resetting ecu resets fuel trims etc. Have you driven it more than just a few min?

 

[Bleakley]

I replaced my MAF and left the battery disconnected for 30 min. however now the car won't idle properly. It seems to run fine when on the street, but when I stop at a red light it has low bouncing idle and after less than a minute of struggling will cut out. Any suggestions? Thx.

BTW, the car was totally fine before, just started a P1070 CEL code hence the replacement of MAF.

Pretty sure that is a fuel trim code.

Verfiy injector resistance with multimeter.
Verify fuel pressure @ idle with vacuum disconnected.
And check for boost leaks for sure.
Report back.

 

[emcee]

UPDATE: I decided to re-install the OEM MAF and lo and behold the car idles fine. So, that leads me to believe the ebay MAF I got is the culprit.

 

[Bleakley]

DANG. No doubt!
Was your code P0170? I'll keep that in mind that your MAF triggered that code...

 

[emcee]

DANG. No doubt!
Was your code P0170? I'll keep that in mind that your MAF triggered that code...

Yes it was P1070 which lists probable causes as: Large vacuum leak, fuel system injectors/pressure, ignition system malfunction, Air Flow Meter malfunction, or exhaust leak near oxygen sensor.

You must be logged in to view this image or video.

I took the old MAF and cleaned it with MAF cleaner (DO NOT USE anything else) so perhaps the original CEL problem was from a dirty MAF. The car has 146000 miles so I'm hoping it was that simple.