Taurus Car Club of America : Ford Taurus Forum banner

1 - 20 of 20 Posts

·
Registered
Joined
·
20 Posts
Discussion Starter #1
So i have a 2002 ford Taurus with OHV 3.0 Vulcan. I have been chasing what seems to be a vacuum leak according to obd2 (15 to 20 LTFT on both banks at idle). When starting engine at ambient temperature the idle is erratic up and down from 500 to 900 rpms. The obd is telling me the vacuum is as low as 9 to 15 at idle. Whenever I hit the throttle in the engine bay i get a woosh coming from the intake (yes woosh is a technical term lol) . Well....lol I have been writing this on and off for the last few hours so please excuse the brokeness of this post. I just got back inside from running a smoke test on the vac system anddddd it seems that i have a leak behind the upper intake where the EGR is connected to the plasticon the upper intake. I will post my results today or tommorrow once i do the repair so hopefully this will help some people if they run into this problem.
I just got done doing lower intake gaskets and oil pan gaskets so im pretty much ready to set this car on fire... o_O
 

·
Registered
Joined
·
176 Posts
Use a small mirror to look at the EGR gasket to see if it slipped on installation. I thought I had mine right but I was wrong.
 

·
Registered
Joined
·
20 Posts
Discussion Starter #3
So heres an update. I just installed the egr Oring seal. Turns out the replacement was a round o ring instead of the flat seal OEM style (correct me if im wrong please). Never the less it fit well. Thank you for mentioning checking on it to make sure it did not slip. I made sure to press the oring into the shaft before i tightened the two bolts down. Still having the same problem. Low vacuum on cold start. Still getting the wooshing sound when pressing the throttle. Im really starting to think my plastic upper intake has a hairline fracture that seals when it heats up maybe? It seems like i hear it from the bottom side of the upper intake. I tried spraying it with carb spray while "wooshing" it but i really cant get at it to spray it.
 

Attachments

·
Registered
Joined
·
20 Posts
Discussion Starter #5
So i took off the vacuum dist valve and used 2 part 3m polyurethane glue along the seals of what im guessing are check valves. Went for a test run and vacuum seems a little better but my LTFT for both banks are still around 15 percent at idle ( damn near 0 to 2 percent while cruising)
Ill have to wait until morning to try a true cold start and see if the erratic cold idle went away. Im still thinking hairline crack or something wrong with upper manifold (oh Ford WHY PLASTIC....lol). Let me know what you all think... even if you think im crazy 🙂
 

·
Registered
Joined
·
20 Posts
Discussion Starter #6
Oh and kekaye56, i will be doing a smoke test tommorrow again so ill definitively know if i sealed that EGR tube correctly.
 

·
Registered
Joined
·
20 Posts
Discussion Starter #10
Yes thank you for the info. I will be doing a smoke test in about an hour once the engine is cold. I will post results. 🙂
 

·
Registered
Joined
·
20 Posts
Discussion Starter #11
Did the test. Found out the new egr gasket did not seal. So i used rtv. Did another smoke test after that dried and smoke is coming out of the seams of the egr disc itself. Its weird because i tested with a vacuum pump on the top nipple and it held vacuum at the egr. Guess its time for a new egr.
 

·
Registered
Joined
·
20 Posts
Discussion Starter #12
Slapped the new EGR valve on. Fixed that leak... checked again .... the front valve cover gasket needs changed...lol and the fight continues. Smoke just come belowing out of the valve cover.
 

·
Registered
Joined
·
20 Posts
Discussion Starter #13
Figuring that the valve cover probably has nothing to do with my cold start (valve cover access to vacuum system is before the throttle plate and intake) i am back to possibly a bad upper intake. If i tap on it with a rubber mallet after i start it i can hear a slight woosh..
 

·
Registered
Joined
·
20 Posts
Discussion Starter #14
So i blocked off the hose going to the front valve cover from the accordion (before throttleplate) and i performed another smoke test. I had smoke coming out of the front cover still. Is it possible the front valve cover is tied in with the intake vacuum system?
 

·
Registered
Joined
·
9,681 Posts
So i blocked off the hose going to the front valve cover from the accordion (before throttleplate) and i performed another smoke test. I had smoke coming out of the front cover still. Is it possible the front valve cover is tied in with the intake vacuum system?
The crank case and valve cover area are all one open system inside, The DOHC is very unusual as other engines vent from in one cover and out the other with the PCV in that cover. The DOHC is a dual air in and outlet in the crank case center.


-chart-
 

·
Registered
Joined
·
9,681 Posts
Does that also happen with the OHV 12v Vulcan though?
The Vulcan is conventional positive crankcase vent. Metered, filtered air from the accordion goes to one valve cover, through the crankcase, and to the other valve cover, out the PCV valve to the intake vacuum.


-chart-
 

·
Registered
Joined
·
20 Posts
Discussion Starter #19
Replaced valve cover gaskets. And put 6 new properly gapped spark plugs in. Still has a rough start. So i got the good ol stethoscope out and started searching for where the woosh noise after hitting the throttle is coming from. Seems like its coming from the egr tube seal on the upper intake. Maybe i did not seal it properly? I will find out after i take the upper intake off for the 9th time...lol
 

·
Registered
Joined
·
20 Posts
Discussion Starter #20 (Edited)
Trying to upload a video of the wooshing noise and the vacuum readings at the same time. Well the video didnt have very good quality but let me know what you think. The vacuum gauge is hooked directly to the intake behind the throttlebody.

https://youtu.be/f4JDTsgpFFw
 
1 - 20 of 20 Posts
Top