Hidden Vacuum ports ?
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From: Southwest VA
Hidden Vacuum ports ?
Does any one know if there are any vacuum ports on an 88 4.9L other thatn the tree on top ?.......my Bronco is losing A/C on a hill ....(diverts to the defrost) which I know is a vaccum leak.....was looking around and found a line broke under the intake plenum running up to the smog valves with the fuel rail ....fixed it......but I must have knocked something off or broke another one....it is running real bad now....almost like a direct intake runner vaccum leak killing a cylinder....I saw the fuel pressure vacumm line and it's ok.......what else is under there I might have pulled off ? I can't see anything ???
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Joined: Nov 2007
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From: Denver Metro Area, CO
Could be a vacuum leak, could also be a hosed-up vacuum system.
Ford integrated vacuum reservoirs into the system - a fruit juice can for the engine controls, and a softball-sized ball for the HVAC system.
Both of these serve to supply vacuum during times of little to no engine vacuum (as you've found).
There should be a diagram on the radiator support under the hood that shows the engine controls (I don't think those diagrams include HVAC stuff).
Ford integrated vacuum reservoirs into the system - a fruit juice can for the engine controls, and a softball-sized ball for the HVAC system.
Both of these serve to supply vacuum during times of little to no engine vacuum (as you've found).
There should be a diagram on the radiator support under the hood that shows the engine controls (I don't think those diagrams include HVAC stuff).
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
Quite honestly, you'd probably have better luck posting in 87-96 instead of here with a topic like this.
1987 - 1996 F150 & Larger F-Series Trucks - Ford Truck Enthusiasts Forums
1987 - 1996 F150 & Larger F-Series Trucks - Ford Truck Enthusiasts Forums
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