Question about 1990 Ford F150

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90' f150 4.9l running rough

I have black/clear fluid pouring out the tail accompanied by white smoke until the engine is warmed up. Replaced plugs, wires, cap and rotor and no change. There is a 1" vacuum hose on top o' the passenger side wheel well that goes to nothing and leads out from a large (about 8" long X 4" diameter) canister. Nothing seems to change when i plug it. idle bounces between 500 and 1000 rpm constantly. Is this the timing or egr valve or what? Can someone please help? I know next to nothing but want to learn.

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  • eric_desmond Nov 29, 2008

    Thanks Ill look into it Asap. That might explain the brand new radiator the truck came with. However the fluid has a VERY strong gas smell. How can I verify a cracked head?

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You could do a compression test witch would require you to pull the spark plugs or you chould pull the head.

Posted on Dec 04, 2008

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Mrp-2204 has it! The cracked head is my quess. A gasket prob usually is more after the fact. This engine has been overheated a few times. No doubt. Frankster016

Posted on Nov 29, 2008

  • frankster016 Nov 29, 2008

    To find a cracked head is[in your case] to do a cylinder leak test with the engine cold. But the alternative is to remove the sparkplugs and check for one that is too clean. The coolant will remove all the deposits. If you find 2 together, then a head gasket is likely. But just having the gasket replace may just be a 'band-aid'! The head could be slightly distorted. OK Frankster016

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You have either a cracked head or a blown head gasket letting water seapdown into the cylinder, when it is cold it does it worse becaues the metal is cold , when it warms up the metal expands and seals it off some what and it is not so noticeable.

Posted on Nov 29, 2008

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I hope you don't shoot the messenger, It sound like a blown head gasket.

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Things to check to confirm.
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