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Corrosion, car stalling, can anyone name this part?

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  • Corrosion, car stalling, can anyone name this part?

    My car has been stalling randomly at stop lights or randomly when I put it in park. I found a lot of mice droppings under the hood, so now I'm checking everything under there and replacing some chewed up wires. I came across this part which is severely decayed and I'm wondering if it may be the source of the stalling... here are some pictures:













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  • #2
    Looks like a vacuum line... and if you have a vacuum leak from a line having a hole chewed in it... it could certainly lead to a rough idle and stalling at idle. No clue what that could be for, or what it terminates in that cap, that's odd.
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    • #3
      At a guess... vapor release valve? What does it come out of?
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      • #4
        Originally posted by malcom2073 View Post
        Looks like a vacuum line... and if you have a vacuum leak from a line having a hole chewed in it... it could certainly lead to a rough idle and stalling at idle. No clue what that could be for, or what it terminates in that cap, that's odd.
        If it was a vacuum line, shouldn't it go somewhere from there instead of being terminated? Is it possible that there would be the option to have more than one vacuum line and this one is terminated? Rough idle and stalling is definitely what my issue is, so I'm going to have to look around some more. This gives me something else to look into.


        Originally posted by TruckinMP3 View Post
        At a guess... vapor release valve? What does it come out of?
        It's coming out of the lower part of the engine as far as I can tell.
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        • #5
          Originally posted by PaulF View Post
          If it was a vacuum line, shouldn't it go somewhere from there instead of being terminated? Is it possible that there would be the option to have more than one vacuum line and this one is terminated? Rough idle and stalling is definitely what my issue is, so I'm going to have to look around some more. This gives me something else to look into.

          It's coming out of the lower part of the engine as far as I can tell.
          Yea that looks like a vacuum line. Alot of times different models/features will require an extra vacuum line or one in a different place so they tap it and then cap it if its not used. Kinda the same way most cars have wiring for features even if they don't have them.
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          • #6
            Originally posted by justchat_1 View Post
            Yea that looks like a vacuum line. Alot of times different models/features will require an extra vacuum line or one in a different place so they tap it and then cap it if its not used. Kinda the same way most cars have wiring for features even if they don't have them.
            Makes perfect sense. Seems obnoxious the way it is capped though. I'll see what I can find at autozone to replace it. Thanks.
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            • #7
              how old is the car, does it happen only when the engine is warm? check the engine wiring harness that goes from the module all the way to the crank sensor, my '98 bonneville did the same thing, due to canadian weather here, very hot and cold climates change frequently, causes the wires to deteriorate over time, also check your module, that may also be the culprit, my 2nd bonneville would cut out when it was warm, it would just crank and crank and crank even tho it has fuel, cooling it off it would start, but only for 30 minutes, check those 2, engine wiring harness and module.

              if you have cranking issues as well, due to the engine harness not being easily acessible, you'd have to unravel the tape to check the condition of the inner of the cables, usually the heat of the engine and outside temps can melt the wires over time, my first bonneville had the hardness melted in 2 different locations, one near crank sensor, and one near module, look for the fine print, MADE IN CHINA, lol j/k
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              • #8
                Looks like a vent on the transmission to me. If so, it won't be causing your stalling, but it should still be replaced to keep water and mice droppings out of your tranny.
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                • #9
                  Yep, vent hose
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                  • #10
                    Your car is stalling and its not throwing a check engine light? I would check to make sure your check engine light works :P

                    If it's stalling. The car should have caught it and stored a code. My guess would be a malfunctioning sensor.

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                    • #11
                      That device is not on the engine. It's a vent commonly found on transmissions, and I'd hate to say, it's not the cause of your car stalling.

                      In a worse case scenario, water may enter the tube if the hose is chewed or broken.

                      If it is completely plugged without any ventilation, then you will eventually encounter a blown torque converter seal, or rear tail-shaft seal. If the vehicle is a front wheel drive, the output half-shaft seals will be blown if that device were plugged up.
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                      • #12
                        The car only throws the check engine when it is stalled and I can't exactly check it with obd when im stalled at a stop light. What ended up being the issue is my throttle body. Cleaned that up real nice and works again. Thanks everyone for your help.
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                        • #13
                          take it out and start your car of it doesent fix it stick your finger on the tube it came off of if you feel something its gata be re caped tape it all up for now i think you might have other problems thoe my car has loads of electrical problems and i had mice luckily it wasnt in the engine
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