Intake vaccuum port?
11-01-2015, 02:32 PM
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Intake vaccuum port?
My 96 B1500 3.9L is running poorly when warm. I noticed there's an open port below the PCV port. Can I get some help identifying what is supposed to be there? I found nothing in the service manual.
Note the open port is the lowest of 3 in the area.
11-01-2015, 04:13 PM
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If you plug it off does it run better?
11-01-2015, 04:38 PM
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Could've just been a cap that cracked and fell away.
11-01-2015, 05:16 PM
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It does run better when plugged. It seems to idle high and unsteady when unplugged.
Can anyone show what a cap is supposed to look like? Otherwise I'm tempted to use a little stopper.
Thanks for you thoughts.
11-01-2015, 08:26 PM
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Just plug it with whatever you can plug it with.
11-03-2015, 12:24 AM
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11-26-2015, 07:41 AM
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I have a 96 3.9l as well, will look in the morning if there is something there
11-27-2015, 12:33 AM
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so I couldn't see, maybe I need to take off the doghouse? what side it is on?
12-14-2015, 04:42 PM
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I finally got around to checking today, mine does have a cap on that port, it is just a rubber cap