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  #16 (permalink)  
Old 09-11-2019, 05:18 PM
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Quote:
Originally Posted by 38 old coupe View Post
I had the car smoke tested and their was no vac leaks.
Still have the lean codes I bought blue driver so I can have live data but canít post data
The injectors didnt shrink.
They arent too small.

dont make any changes until you find good evidence.

Dont change O2 sensors.That is P i ssing money away.They are obviously working if they are correcting the mixby 25%

I would question the smoke test.

2 Days ago I had a 2004 2500hd with a 6.0 Vin "U" and I smoked it.
The EGR pipe was leaking at the intake, and it was tough to seal up. I ended up doubling up O rings on it and the idle and trims Both improved.
I smoked it after I was done .It still had a tiny leak. But it was so much better and I had no more time so...out the door it went.

Lights out, trims under 5%.. Good to go.

Whwn doing the smoke test the throttle body needs to be covered/blocked to create some pressure in the intake, to exacerbate the leak /failure point

Remember I do this everyday for a living.

Now, I will look at your data log. Maybe i will see something there.

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  #17 (permalink)  
Old 09-11-2019, 05:28 PM
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All your PID values look good, except the trims.

the 2 most likely causes are

Intake leak/air leak downstream of MAF sensor (unmetered air)

or fuel pressure low.

I am still questioning the smoke test.

If you have low fuel pressure, volume will also be low

You will see the effect at WOT (wide open throttle) as the engine may surge ,lose power, or lack power for acceleration.

You can do a quick fuel pressure check. verify while under load as well ( driving /accelerating)

Go from there
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Old 09-11-2019, 05:32 PM
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It would be a good Idea to check/clean the MAF (Mass Air Flow ) sensor,just as a routine service. see if things improve
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