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Unknown Wire: 5.0 L 1991 Mustang

Old 03-22-2019, 03:19 PM
  #1  
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Question Unknown Wire: 5.0 L 1991 Mustang

Hi.
I was doing an injector cleaning and general engine bay clean-up. I found this wire ... I have no idea if it actually belongs to the car or not.
Anyone ever see this wire? It has a heat shield and the wire is red. One end is stamped with m-3-18.

Stumped.

Thanks

Russ
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Old 03-22-2019, 05:35 PM
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That looks like a vacuum line...look around your throttle body or EGR valve for vacuum fittings with no line on them. If you have a vacuum leak, it may cause the car to idle erratically, and you may hear a hissing noise under the hood with the engine running. If so, that might help you track its location down if you can't find it by looking.
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