Maf Sensor Intermittent Failure?

[AdamE]

Ive been slowly making changes to this project. Setup is a 5.3, turbo cam, 7875 turbo, pump gas, p01 ecu, 4l80e, dbw throttle in a 1970 c10. Im suddenly having a issue causing the truck to not start. Looking at the check engine codes shows that the MAF sensor is not failing. Im not sure what would be causing the issue since i havent changed anything MAF related, it has all been ironing out the VE table. Could i get some guidance and get someone to take a gander at my tune file to see if there is something i am overlooking. Im guessing its not starting becuase the MAF is not failing but i could be wrong. I say that because everytime i would look for check engine codes the MAF codes would be there and since it has not been starting the MAF codes arent showing up.

Thanks

eman c10 9.7.4.hpt

[blindsquirrel]

Why does it have a MAF on it at all? It's not as if ditching it would cause it to fail an emissions inspection or something.

[AdamE]

Why does it have a MAF on it at all? It's not as if ditching it would cause it to fail an emissions inspection or something.

Did i miss something? Lol care to elaborate?

[bk2life]

Did i miss something? Lol care to elaborate?

i think he means, its an old truck why the MAF?

[SiriusC1024]

He's set the MAF to fail, but it's not showing the DTC.

Got a log? Starting issue could be cold weather related. Injector P/N?

[blindsquirrel]

MAF DTCs won't show up in the 'Details' tab on the first run cycle after a reflash, even though the code(s) are Current. There is a PID flag you can log called 'Mass Airflow Sensor State' that will show in real time if it's failed over into SD or not.

The MAF is likely to be only annoyances, no benefits. Especially with a turbo, double especially if the cam is bigger than...something, but you didn't describe the parts used much at all, so that helps.

[AdamE]

i think he means, its an old truck why the MAF?

He's set the MAF to fail, but it's not showing the DTC.

Got a log? Starting issue could be cold weather related. Injector P/N?

I did a write entire and cleaned the spark plugs, she popped off like normal. Good to go

[SiriusC1024]

How are you going to feed a turbo with 25lb injectors?

[blindsquirrel]

24lb injectors? And returnless? And a 7875? Good Lord.

fake edit: Oh. Your MAF table is all zeroed out. Don't do that, just fail the sensor (or if you're sensible get rid of it permanently). Put the stock MAF numbers back in.

[AdamE]

MAF DTCs won't show up in the 'Details' tab on the first run cycle after a reflash, even though the code(s) are Current. There is a PID flag you can log called 'Mass Airflow Sensor State' that will show in real time if it's failed over into SD or not.

Good info, thanks. Im going to go do a big smokey, over-fueled burnout at the WEF in Davos. Heard its a good week to do it. With my failed MAF sensor

[SiriusC1024]

Dude. What injectors? What fuel supply setup? Don't hack tune the thing.

[blindsquirrel]

Troll. And not a very clever one, either.

[AdamE]

24lb injectors? And returnless? And a 7875? Good Lord.

Its hard out here for a pimp. Lol jk, its a customers budget minded project. Its got a holley return style regulator on it, by no means is it the ideal setup but its gotten the party started. Just getting bugs worked out in preparation for dyno time with more injector. Ill toss the stock MAF numbers back in as well. Thank you


Transmission shifting is what i was working on before the no-start issue. Stock Converter doesnt like the cam but again, working with what we got.

[AdamE]

Troll. And not a very clever one, either.

no trolling here.

[SiriusC1024]

You're not getting that VE table with stock injectors. They're higher flow, but you kept the factory data. You didn't even flatline IFR and Offset for the return reg. That's quite the bug.

[AdamE]

You're not getting that VE table with stock injectors. They're higher flow, but you kept the factory data. You didn't even flatline IFR and Offset for the return reg. That's quite the bug.

There is still work to be done, i agree.

[SiriusC1024]

That's basic setup. Want help with it?

[AdamE]

That's basic setup. Want help with it?

Ill take the opportunity to learn something any time, yeah I would appreciate that very much. Thank you

[AdamE]

Here is where its at currently, after correcting injector data and MAF table. I think ill probably raise IFR to 36.1 since the stock data is based on 50psi vs the 60psi its running. Or would u suggest dropping the pressure on the regulator?

eman c10 9.7.5.hpt

[SiriusC1024]

What is the part number on the injector and what is the regulator set to?