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Hissing sound when accelerating. Loss of power. V6 duratec…

Hissing sound when accelerating...

Hissing sound when accelerating. Loss of power

Mechanic's Assistant: How long has this hissing noise been going on? Any leaking?

V6 duratec 2010 escape hissing around a month

Mechanic's Assistant: What's the approximate mileage on your 2010 Escape?

183,000

Mechanic's Assistant: Is there anything else the Ford Escape Mechanic should know before I connect you? Rest assured that they'll be able to help you.

That should be good thanks

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Answered in 4 minutes by:
6/26/2022
Ford Mechanic: RiopH,
 replied 1 month ago
RiopH
Category: Ford
Satisfied Customers: 903
Experience: Expert
Verified

Hello, my name is ***** ***** to just answer! I will be assisting you with your vehicle questions today. I want to give you the best service possible. Sorry you are having issues with you vehicle. If you have any questions or concerns, please don't hesitate to let me know. Sometimes it may take a few minutes for me to respond because I may have to look up information about your concern. If you receive a prompt for a premium service or a phone call you can ignore it unless you feel it is necessary to help you. Who am I speaking with today?

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Customer reply replied 1 month ago
Dan
Ford Mechanic: RiopH,
 replied 1 month ago

Hello Dan, can you describe the hissing sound in more detail? As well as how the lack of power plays out?

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Customer reply replied 1 month ago
2010 escape
Duratec v6
Flex fuel
AWDIntermittent hissingBogs down on acceleration
Ford Mechanic: RiopH,
 replied 1 month ago

Do you have a check engine light on?

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Customer reply replied 1 month ago
I emptied out cat on the underneath.
Yet to check other cat's.
New MAF sensor
New fuel pump
New throttle body
Relearned throttle body to PCM
Ford Mechanic: RiopH,
 replied 1 month ago

What is the code that is stored?

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Customer reply replied 1 month ago
It was for the cat's
Ford Mechanic: RiopH,
 replied 1 month ago

Do you know the numbers of the code/s?

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Customer reply replied 1 month ago
Negative.
I forgotThere are 2 vacuum lines attached to the transmission dipstick.
One of them is not connected to anything.
Where does it connect to?
Ford Mechanic: RiopH,
 replied 1 month ago

Alright, well it does seem likely that you have an exhaust restriction given your symptoms and past codes. The first thing to do will be an exhaust backpressure test. Pull each of the upstream O2 sensors and use a vacuum/pressure gauge to check backpressure. Get a reading at idle and also say at 1800 rpm

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Customer reply replied 1 month ago
Ok
Ford Mechanic: RiopH,
 replied 1 month ago

You want to send me a picture of those lines you are asking about?

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Customer reply replied 1 month ago
I will have to purchase a gauge
Ford Mechanic: RiopH,
 replied 1 month ago

That is the transmission vent hose. It is supposed to be there and open like that.

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Customer reply replied 1 month ago
Ok. Thanks.
I think that's where the hissing sound is coming from
Ford Mechanic: RiopH,
 replied 1 month ago

There shouldn't be any hissing coming from that hose attached to the dipstick. That would mean that there is some type of pressure or vacuum on the transmission case, which there isn't supposed to be. You will need to identify exactly where the hissing is coming from. You can use a length of 5/8" hose with one end to your ear and the other end near the source spot. When you get next to the source it will get really loud in your ear.

Let me know how the test goes for the backpressure when you get your gauge.

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Customer reply replied 1 month ago
Ok. I appreciate your time and knowledge. I'm about to tear into this.
Ford Mechanic: RiopH,
 replied 1 month ago

Alright, sounds good.

RiopH
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Satisfied Customers: 903
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