1995 4.9L Vacuum Help
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Trailering
Joined: Feb 2015
Posts: 21
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From: College Station
1995 4.9L Vacuum Help
Alright guys I have a 1995 f150 XLT 4.9L. I am trying to figure out a vacuum leak but I ran into a bit of confusion. I was looking online and I see that most people have a EVR, TAB, and TAD solenoids with a diverter valve. I look at mine and all I have is an EVR, and TAB solenoid with no diverter ( that I can find at least). Instead, I have the TAB ruining to an "Air Bypass Valve" right on top of the smog pump. Am I missing something or did they make these trucks different?
Mine looks like this:
While every other one I see looks like these:
Mine looks like this:
While every other one I see looks like these:
Elder User
Joined: Sep 2012
Posts: 505
Likes: 7
Looks like mine. I think the valve used to have 4 hoses -- 1 from air pump, 1 to head, 1 to cat, 1 to a little muffler. Mine doesn't have the hose to the little muffler.
You should still have 3 solenoids on the valve cover behind the distributor -- EVR, TAB, and TAD -- and two vacuum lines to the AIR valve above your alternator.
You should still have 3 solenoids on the valve cover behind the distributor -- EVR, TAB, and TAD -- and two vacuum lines to the AIR valve above your alternator.
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Trailering
Joined: Feb 2015
Posts: 21
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From: College Station
Yeah that's what I've seen online and in junkyards. But when I look at my valve above the alternator it just has one nipple for a vacuum hose which goes to the middle solenoid (TAB), see first picture in original post for an idea of what I'm talking about. Basically, that "valve" has a hose coming from the air pump, to the valve, and straight to the exhaust pipe behind the cat. There is no hose leading from the valve to the engine. To add, this truck was bought brand new from my father and he never did anything to it other than change the oil and put gas in it so I know he didn't start ripping stuff out lol. Just trying to get some clarity and see if anyone has a setup like me and the first picture.
Elder User
Joined: Sep 2012
Posts: 505
Likes: 7
Ahhh I gotcha. I thought the third pic was your truck.
Ford had different variations of the smog system. I can't tell you the rhyme or reason for different variations but it has been mentioned in a couple threads here.
Do you still have the vacuum hose routing sticker on the radiator support?
Ford had different variations of the smog system. I can't tell you the rhyme or reason for different variations but it has been mentioned in a couple threads here.
Do you still have the vacuum hose routing sticker on the radiator support?
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