MAF Help

[Ubaderb]

I posted awhile ago about having the Alpha N/MAF delete checked on the Ecuworx software. I finally flashed my car completely back to stock so I can remove it. I now have:

• Somewhat rough idle at startup
• Drops to 500 rpms when I come to a stop/when I rev the engine
• Check engine light for 41 (signal, mass airflow sensor)

So did the PO just have a shop code out the MAF to not get a code? Seems like a weird roundabout way to fix it. The PO did not spare a dime during the 10 years of service before I had it, so it's even more of a head scratcher. Back to the brief troubleshooting I did with OBD Fusion, unplugging the MAF sensor while running barely changed the g/s. With plug in and idling it is 6.67. Unplugging put it at 6.23. As I said I have done just the barebones of troubleshooting. What should I do for a deeper dive? Cleaning the MAF should be the next step right? Since it didn't really change the flow. Anything else I should look at? Any PIDs I need to look further at?

[Slideways]

Did the previous owner modify the MAF wiring to work with an intake air temp sensor? That is required when using Alpha-N. The wiring would have to be reverted back to stock in that case.

[Ubaderb]

Did the previous owner modify the MAF wiring to work with an intake air temp sensor? That is required when using Alpha-N. The wiring would have to be reverted back to stock in that case.

I’m almost certain it’s been factory since day one. Everything looks nice and neat. But if not, should I just look up IAT wiring to double check? From the outside will it look stock?

[Slideways]

I’m almost certain it’s been factory since day one. Everything looks nice and neat. But if not, should I just look up IAT wiring to double check? From the outside will it look stock?

Can you post a picture of the setup?

[sapote]

unplugging the MAF sensor while running barely changed the g/s. With plug in and idling it is 6.67. Unplugging put it at 6.23.

Warm engine idling the MAF rate should be about 4g/s, and so yours with 6.67 is way too high. I would try to swap in a known good one and check the data again.

[Ubaderb]

Can you post a picture of the setup?

From what I can tell it's pretty much stock. Anything else that I should look at?

[Ubaderb]

Warm engine idling the MAF rate should be about 4g/s, and so yours with 6.67 is way too high. I would try to swap in a known good one and check the data again.

I don't have a known good one besides buying a new one. But after pulling it, I might have found at least some of the problem. I am pretty sure I am reading this date code right but that looks like 04/2003 correct? That would make this the original MAF if so.

[Slideways]

I don't have a known good one besides buying a new one. But after pulling it, I might have found at least some of the problem. I am pretty sure I am reading this date code right but that looks like 04/2003 correct? That would make this the original MAF if so.

Yes, MAF is original from 2003 and the engine bay wiring looks stock.