6.0 Mass Air Flow Sensor - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 01-27-2011, 06:25 AM Thread Starter
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6.0 Mass Air Flow Sensor

What is the readings in lb/min that this sensor should read. I have searched the treads and cannot find it.

Cleaned turbo unison ring and re installed.....problem still there.

Truck seems to run fine up to about 2500-3000 RPMS and acts as if it is de-fueling.

Fuel system o.k. EBP sensor o.k.

Thanks in advance

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post #2 of 11 Old 01-28-2011, 08:19 AM
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What is your fuel pressure at WOT? Install the updated fuel pressure regulator spring.

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post #3 of 11 Old 01-28-2011, 08:27 AM Thread Starter
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Cold air side of turbo is warm after driving. I guess cleaning of the vanes didn't help. I guess I need a turbo. There is probably more than .004" of slop in the turbo shaft that I can feel.

Are there any rebuid kits out there for the turbo?

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post #4 of 11 Old 01-28-2011, 08:53 AM
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Even at the intake manifold, "cold" air is about 130 degrees. Compression by the turbo on the order of 24psi on top of 14.7psi (static sea-level pressure) generates a substantial amount of heat even after heat exchange through the intercooler. "Cold" is a relative term in this case as exhaust temperatures under 24psi boost may be on the order of 1200 degrees or more depending on engine load. I'm not doubting your diagnosis, just wondering what your expectations are in terms of temperature assessment.

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post #5 of 11 Old 01-28-2011, 09:58 AM Thread Starter
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I have a 7.3 truck. The one I am working on is a 6.0 truck with 143K miles.

I have autoenginuity and have tested and actuated all I know to test.

FICM passes all test.
Fuel supply passes all test.
I removed the CAT and drove unhooked (same condition)

The 7.3 truck at 22 psi ran up a long hill 1 mile or so pull over pop hood and tube just off of the turbo going to the intercooler is cold as outside air temp if not colder.

Run up the same hill with the 6.0 truck pop the hood and same tube is warm to touch like a hot coffe cup....I do have a IR gun that I could get exact temps off of that I use for exhaust temps and such..... but there is a noticible difference.

There is noticible play in the turbo shaft assembly. No up-pipe leaks noises etc.....customer says it does not whistle like it used to either.

Does it sound like the right diagnosis?

What other test can be ran to ensure turbo?

Autoenginuity will let me command the VGT open and closed while at 1000-1250 RPM and it will spool up and down accordingly. So I know the vanes are not stuck. I removed and cleand exhaust side according to a tech file found on this site.

Any help is much appreciated.

Adrian

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post #6 of 11 Old 01-28-2011, 10:12 AM
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Good fuel with anti-gel...it's been cold so maybe some Diesel 911 is needed? Condition of fuel filters? Fuel pickup tube in fuel tank clogged with debris (I recall a few truck owners who had this to happen...not necessarily common but could affect fuel delivery under demand)? These are just some ideas that could reflect inadequate fuel flow at demand. Whistle on the turbo is a condition of the vane position (and number of vanes but that wouldn't change for the owner unless he had the turbo replaced) if you cleaned it, I bet it sounds better. Does the AE let you monitor fuel delivery over time such as at 2500-3000rpm? I suspect falling fuel pressure - perhaps from an old fuel pressure regulator spring as PGreenSVT observes or a clogged fuel filter, pickup tube, etc. Are all the injectors buzzing with the AE?

Good luck with the ongoing diagnosis.

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post #7 of 11 Old 01-28-2011, 10:36 AM Thread Starter
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I have the up-dated version AE with bi-directional CAN communication.

Buzz test and cylinder contribution good. Contribution test graph is flat as Kansas no blips at all before or after each cylinder.

Removed fuel filters. Look good. Secondary fuel bowl on top of motor will fill in about 4-5 sec with or without filter.

Truck has been inside my shop wood heater (burns while I am at work even).
Temp never drops below 50 F.

Customer said he added fuel treatment etc before bringing...because he thought it was gelling up.

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post #8 of 11 Old 01-28-2011, 10:50 AM
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Quote:
Originally Posted by away View Post
I have a 7.3 truck. The one I am working on is a 6.0 truck with 143K miles.

I have autoenginuity and have tested and actuated all I know to test.

FICM passes all test.
Fuel supply passes all test.
I removed the CAT and drove unhooked (same condition)

The 7.3 truck at 22 psi ran up a long hill 1 mile or so pull over pop hood and tube just off of the turbo going to the intercooler is cold as outside air temp if not colder.

Run up the same hill with the 6.0 truck pop the hood and same tube is warm to touch like a hot coffe cup....I do have a IR gun that I could get exact temps off of that I use for exhaust temps and such..... but there is a noticible difference.

There is noticible play in the turbo shaft assembly. No up-pipe leaks noises etc.....customer says it does not whistle like it used to either.

Does it sound like the right diagnosis?

What other test can be ran to ensure turbo?

Autoenginuity will let me command the VGT open and closed while at 1000-1250 RPM and it will spool up and down accordingly. So I know the vanes are not stuck. I removed and cleand exhaust side according to a tech file found on this site.

Any help is much appreciated.

Adrian
How much play?

What kinda fuel pressure numbers are you seeing?

What year is the 6.0?

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post #9 of 11 Old 01-28-2011, 11:10 AM Thread Starter
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2005 6.0 F-350 dually

What is the correct method to measure the endplay? Guessing I would say 0.010" to 0.020".....but it doesn't seem to be hitting or binding.

Fuel pressure off the top of my head was 40-45 ish.
How do you measure while driving under load???

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Last edited by away; 01-29-2011 at 03:37 PM.
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post #10 of 11 Old 07-27-2011, 02:32 PM
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did it end up being the mas air sensor im having a very similar problem
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