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Old 05-29-2019, 10:16 PM
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06 lq4 : mass air flow sencer problems

Hello I have a 06 lq4 and psi computer for it with a 04 tune and Iím running a 5 pin mass air flow I keep getting lean codes both banks so I read to unplug the mass air flow to see if it runs better so I did and the computer didnít set a code.
its getting 12.5 volts and the ground is good I switch around and get 12.5 volts doing a negative test.
Then I back prob the yellow wire and I have 4 volts with key on and when I start the car and then I rev up the motor the volts drop to 3.12 and rise back up to 3.66 at 2500 rpm

Any ideas why why it wouldnít set a code I wouldnít thank that psi would turn off the mass air flow codes ?
Thank you kelly

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Old 05-30-2019, 07:55 AM
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Did you get a data log?
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Old 05-30-2019, 11:08 AM
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I did not I donít have hp tuners.
Iím thanking of getting BlueDriver so I can read live data and freeze frame data tell I can afford hp tuners.
I was told it doesnít set a code for a few drive cycles
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Old 05-30-2019, 12:41 PM
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A scanner that provides live data might provide some clues.
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Old 05-30-2019, 06:38 PM
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Yep. Live data.

Look at fuel trims
Check the airflow Gms /sec

Is your fuel pressure up to snuff?
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Old 05-30-2019, 08:04 PM
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Not to long ago when I was getting these codes I put a gauge on it and it was fine put it fuel pump. If it was going bad wouldn’t the motor go lean when I was under load while driving only time I get the code is at idle I hope to order the BlueDriver one this weekend if I have enough money if not the following week or two I’m letting the new mass air flow go back so I have that money towards the scanner to see what it’s doing
I just went and watched the video of the fuel pressure it steady at 58 lbs and it’s a returnless fuel rail with the corvette fuel filter/regulator motor

Thank you kelly

Last edited by 38 old coupe; 05-30-2019 at 08:23 PM.
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Old 06-18-2019, 09:01 PM
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Well I had my mass air flow flowing the wrong direction so I turned it around d and Iím still getting the lean codes both banks

Called a tuner shop today they wanted 750 to tune it and another 150 to run the car on the Dyno that sounds way to much.

I could buy the Holley terminator x for a few hundred dollars more and not have to bring it back to the timer when I put In a bigger cam.

Or have the learning curve of hp tuners.
Hp tuners would be nice to learn But Holley self tune has been sounding like a good product to use
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Old 06-19-2019, 07:01 AM
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You can buy the ELM327 Dongle from E Baeeyyy for $20 or less. Get the Torque Application for a smart phone or tablet. App is free. Bam, you have a scanner, you can read live data with and clear most P-codes. For around 20 bucks. No need to pay more. I am a professional mechanic, {at least I look like one!} and this is what I use to diagnose vehicles in the field. This way I dont take the chance of losing my high dollar scanner somewhere. It is also super small and convenient.
Something like this if you have Android...

https://www.ebay.com/p/OBDII-Code-Re...76682830&rt=nc

I have had 2 of this particular model and not had problems.
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