Boost gauge stuck open - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 04-12-2017, 01:36 PM Thread Starter
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Boost gauge stuck open

Was driving on the highway today when I noticed my oem boost gauge stuck at 40. Could tell I was running naturally aspirated as well at that time, no boost. Pulled off, turned the truck off and back on, everything now normal. Any ideas?
2012 f250 6.7 xlt 4x4
118k miles
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post #2 of 14 Old 04-13-2017, 12:11 PM
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check your intercooler boots for any that have popped off or cracked

as for the gauge I can't explain that, maybe a sensor or a fluke. In order to read 40 psi for real, its gotta have 40 psi of pressure...if the turbo was blowing to atmosphere there would be near 0 pressure. odds are the stepper motor in the cluster hasn't failed so rule that out.

are you tuned?

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post #3 of 14 Old 04-13-2017, 12:12 PM
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Originally Posted by heleonardman View Post
check your intercooler boots for any that have popped off or cracked
Turning the truck off then on wouldn't fix this.


OP do you have a monitor of any kind that will let you read ebp, map, and vgt? False ebp reading/voltage can cause a number of issues, same with map.

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post #4 of 14 Old 04-17-2017, 07:41 PM
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Boost gauge stuck open

It's the MAP sensor if your boost gauge is sitting at 40 all of the time...

Happened to me after I attempted to clean it and I messed it up ahaha. Installed a new one and good to go...
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post #5 of 14 Old 04-19-2017, 03:54 AM Thread Starter
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Quote:
Originally Posted by CrazyS0b View Post
Turning the truck off then on wouldn't fix this.


OP do you have a monitor of any kind that will let you read ebp, map, and vgt? False ebp reading/voltage can cause a number of issues, same with map.
So the truck does have a tube from the previous owner but I don't have anything now other than the oem boost gauge. Any recommendations short of buying a tuner to get these readings?
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post #6 of 14 Old 04-19-2017, 03:57 AM Thread Starter
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Originally Posted by dsmracing1 View Post
It's the MAP sensor if your boost gauge is sitting at 40 all of the time...

Happened to me after I attempted to clean it and I messed it up ahaha. Installed a new one and good to go...

Okay sweet I'll get in there and clean it
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post #7 of 14 Old 04-19-2017, 04:06 AM Thread Starter
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Originally Posted by dsmracing1 View Post
It's the MAP sensor if your boost gauge is sitting at 40 all of the time...

Happened to me after I attempted to clean it and I messed it up ahaha. Installed a new one and good to go...
Any chance you've got a 6.7 and can point me in the direction of where the MAP sensor is located
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post #8 of 14 Old 04-19-2017, 09:11 AM
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Originally Posted by Luc58227 View Post
Any chance you've got a 6.7 and can point me in the direction of where the MAP sensor is located


My 6.7 is far from stock but I believe on the stock intake manifold it should be right on top of the engine. The black plastic piece in the middle of the engine on top...
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post #9 of 14 Old 04-26-2018, 05:11 AM
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Originally Posted by dsmracing1 View Post
My 6.7 is far from stock but I believe on the stock intake manifold it should be right on top of the engine. The black plastic piece in the middle of the engine on top...
Mine is doing the same thing, but I'm loosing a lot of coolant, so it keeps moister on the map sensor. most likely yours is clogged with carbon.
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post #10 of 14 Old 04-26-2018, 05:29 AM
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Originally Posted by dsmracing1 View Post
It's the MAP sensor if your boost gauge is sitting at 40 all of the time...

Happened to me after I attempted to clean it and I messed it up ahaha. Installed a new one and good to go...
Mine is doing the same thing. But it's because I'm loosing a lot of coolant. Moisture on the map sensor keeps making the boost stick open at 35psi.
Most likely yours is clogged with carbon. I have a few friends that have had the same issue. Map sensor is on the top back and to the right side on the black plastic intake. (the top of the engine). it's a 7mm socket to remove. You can first try to get some Electrical cleaner and spray in it to clean it out. Make sure the hole it came out of, is not also clogged up. If this doesn't fix it you may just need a new Map sensor. Mine is a 2012 6.7L and it was about $55.00 at my cost form the dealer. The aftermarket ones from the auto part stores are more expensive. Like $65-$100 go figure.
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