Hunting down vacuum leaks, quick question - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 6 (permalink) Old 05-06-2019, 10:55 AM Thread Starter
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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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post #2 of 6 (permalink) Old 05-06-2019, 12:22 PM
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That line is someone's version of the transmission vent tube ghetto TSB

It's SHO time!


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post #3 of 6 (permalink) Old 05-06-2019, 01:05 PM
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Quote:
Originally Posted by Tanshin View Post
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.

See pic, watch for this. Mine fell off the nipple on the intake and makes for big leak. My fix was this clamp from my spare parts box. Be sure the three large hoses that plug in the accordion are in place, one goes to the black box on the firewall, and the other two go to their respective side valve covers. Those ells needs to be in good shape, they break, crack, leak. This is not vacuum but fresh "metered" air.


As noted in the other post, the tranny vent is not rocket science. It is a vent. It keeps dirt and water out. It is easy to hit the rubber cap and plug the vent and it makes a fluid mess. If your cap is missing the hose fix is fine. I prefer clean caps put on according to them being wobbly loose like they were designed. When you start the engine, the fluid level drops and some air must go inside. When you shut the engine off the fluid level rises and that air must escape. If the vent is plugged, it pushes the dipstick up and some fluid pushes out the top of the tube. Been there.


-chart-
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post #4 of 6 (permalink) Old 05-07-2019, 12:35 PM Thread Starter
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Quote:
Originally Posted by chartmaker View Post


See pic, watch for this. Mine fell off the nipple on the intake and makes for big leak. My fix was this clamp from my spare parts box. Be sure the three large hoses that plug in the accordion are in place, one goes to the black box on the firewall, and the other two go to their respective side valve covers. Those ells needs to be in good shape, they break, crack, leak. This is not vacuum but fresh "metered" air.


As noted in the other post, the tranny vent is not rocket science. It is a vent. It keeps dirt and water out. It is easy to hit the rubber cap and plug the vent and it makes a fluid mess. If your cap is missing the hose fix is fine. I prefer clean caps put on according to them being wobbly loose like they were designed. When you start the engine, the fluid level drops and some air must go inside. When you shut the engine off the fluid level rises and that air must escape. If the vent is plugged, it pushes the dipstick up and some fluid pushes out the top of the tube. Been there.


-chart-
Thank you both for your help! I was afraid that it might be a vent for the transmission but was really hoping that it wasn't so it could be the source of the vacuum leak. No such luck! LoL

All the lines on the intake are connected well, no rips or cracks on the intake tube between the MAFS and the throttle body either.

I'm going to pull the upper intake manifold back off this weekend (if nothing else comes up between now and then) to see what the plug from #2 looks like and check everything back there. If I can't figure it out I will start a new topic on the subject. The fact that it is only cylinder 2 and only when cold is driving me crazy.
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post #5 of 6 (permalink) Old 05-07-2019, 02:54 PM
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Have you tried to do a smoke test to look for vacuum leaks?
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post #6 of 6 (permalink) Old 05-11-2019, 10:34 PM
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I always use Maf sensor cleaner to check for bad leaks.with engine on start on one side and slowly spray cleaner on hoses,manifold,pretty much everything till engine stumbles or dies.Then check again and you'll find that pesky leak.I'm old timer and this has worked everytime.good luck God bless.
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