2003 DOHC Mach 1, possible head gasket leak? - Ford Mustang Forum
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post #1 of 4 (permalink) Old 02-27-2012 Thread Starter
stissclaes's Avatar
Joined: Feb 2012
Location: Sweden
Posts: 2
2003 DOHC Mach 1, possible head gasket leak?


I have some issues with my engine. Mach 1 DOHC 4.6 2003.

Lots of white smoke and water is coming from the exhaust.
When reving up there is a delay and the rpm drops at the same time you hear an air sucking sound, then it goes up in rpm. After reving up it takes some time to get back to idle.

I added too much oil before the first start. It was so clean so it was difficult to read from the dip stick. I have since then drained at least a quart and the level is now fine. After running on idle for about 15 min the smoke is still there.

Engine starts very easy. After shut down you hear a long air sucking sound and the PS fluid level goes back to between min-max. During running it drops, don't know if that is correct?

The engine has been sitting for 3 years before starting in an unheated garage and I have added STP fuel injection cleaning to it.
The engine is from cypress auto salvage, they said they have tested it and that it ran great. 45 k miles on it. The remaining oil that was in the engine when I got it was very good looking. No issues at all.

Engine oil has also become brownish in very short time. In addition there is a smell, not only white smoke. As I understand it could be coolant fluid that gets burned.

Could this be a a head gasket problem? Any other ideas or recommendations how to proceed?


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post #2 of 4 (permalink) Old 02-27-2012
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Check the oil for signs of coolant in it or check the coolant reservoir for signs of oil. The oil turning brown quick might be because the engine might have sludge from sitting there for a long time or because previous owner didn't change oil. As for the white smoke I don't know.

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post #3 of 4 (permalink) Old 02-28-2012
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Let me see if I've got this straight. You have an auto salvage (junkyard) Mach 1 4V mod motor that's been sitting around for about 3 years, or so, and the salvage yard guys say it was in great shape when they "tested" it out. How am I doing so far? You basically changed the oil, and added some fuel injector cleaner to the gas tank, and fired it up, correct?

First mistake; believing anything a junkyard mechanic tells you!
Second mistake; buying a junkyard motor and putting it in your car without tearing it down first to see if it is truly in "great shape." At the very least, it should have had a compression check of all 8 cylinders, and a leak down test.

It definitely sounds like there might be something wrong, and white smoke usually indicates water in the cylinders, blueish smoke would be an oil issue, bad rings or valves, and black smoke is indicative of a fuel burning issue.

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post #4 of 4 (permalink) Old 03-01-2012 Thread Starter
stissclaes's Avatar
Joined: Feb 2012
Location: Sweden
Posts: 2
Thanks for the replies. The motor has been sitting at my place for three years.
I will do a compression test and see what it says.
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