Taurus Car Club of America : Ford Taurus Forum - View Single Post - Hunting down vacuum leaks, quick question
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post #1 of (permalink) Old 05-06-2019, 10:55 AM Thread Starter
Junior Member
Join Date: Apr 2019
Location: Florida
Chapter: Southern
Year: 2005
Model: Mercury Sable
Engine: 3.0L 24v Duratec V6
Posts: 7
Rep Power: 0
I have been trying to figure out why my wife's 2005 Mercury Sable is misfiring on cylinder 2 on cold start.

(For a little bit of background information: She has had the car for a few years now but recently started throwing codes P0302 & P0316. If I clear the codes it doesn't throw them again unless it's been sitting, usually after sitting all weekend. You can feel it misfiring and running rough at cold start but once it warms up the misfiring goes away and runs/accelerates very smoothly. I had to change the valve cover gaskets so I also replaced the coils, plugs, intake manifold gaskets and cleaned the EGR while everything was apart thinking that would solve the problem. Everything runs smoother than before, almost like new, but apon sitting it's the same problem, 302 & 316.)

So I am looking for vacuum leaks and I remembered this hose up near the throttle body. I have included pictures that show it's location and where it seems to go, but have no clue what it is supposed to go since it has been ziptied in this location since the car was purchased.

Thank you in advance for your assistance.
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Last edited by Tanshin; 05-06-2019 at 11:02 AM. Reason: Adding attachments I forgot
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