5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

head gasket leaking only under pressure?

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Old 01-07-2007, 08:54 PM
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93 LX FiveO
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Default head gasket leaking only under pressure?

i filled my car up today, and left it on while fueling becuz it was past the E..

anyway i get out and start fueling and i notice a good amount of smoke coming from the exhaust. it smelt sweet like coolant but it wasnt hovering above the spoiler, so it was dicipating (coolant hovers for a while).

by the time i was done fueling all the smoke was gone. i have some things to add though...

the heater core is bypassed right at the back of the intake. it was leaking so coolant was falling onto the exhaust and u could smell it burning but no smoke. it last leaked probably a week ago and i havent smelt it since.

the car smoked bad before i got to bypass it. it was also idling at about 1500 rpm's becuz my throttle plate was getting stuck.

the car will only do this at idle

i am so confused
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Old 01-07-2007, 08:57 PM
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Default RE: head gasket leaking only under pressure?

so? is the hose leaking again..maybe when you tighten'd last the worm clamp cut the hose???
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Old 01-07-2007, 09:01 PM
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93 LX FiveO
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Default RE: head gasket leaking only under pressure?

there are no coolant leaks. whenit leaked before i would have to fill the rad up every few days

i check it today and the rad is full and bright green. my friend said it probably only leaking under pressure.

i heard somewhere u should let it run with the rad cap off and if it bubbles u got a headgasket leak so i did that and not 1 single bubble.

i forgot to add that i think my air pump is crapping out. i ran it for codes a week ago and said bad AIR THERMACTOR.. car runs great will hit 6000 rpm's and go 120mph in 3rd no problem.
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Old 01-07-2007, 09:41 PM
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Default RE: head gasket leaking only under pressure?

so this is pretty much not possible? if it was leaking any bit it would be all the time, correct?
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