Timing chain

2007 FORD EXPEDITION
205,000 MILES • 5.4L • V8 • 2WD • AUTOMATIC
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JOHN SANDERS2
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My timing chain on one bank has been loose, I presume a faulty tensioner. It slaps on startup and quickly catches up.

Last night while driving down a hill not under load, the engine just stopped. I hit the gas, nothing. The engine light came on, no other dash lights.

I hear nothing in the engine that would indicate a chain breaking, but do not know if I had heard something like that or not.

I tried restarting and it just cranks, but "feels" like only one side of the engine is cranking so I do not know if Ford designed a fail safe to prevent valve fouling if the timing chain did break.

Does this sound like a broken chain? Or maybe the chain jumped teeth and now it is just way out of timing? There is no sputtering, etc, no combustion at all.
Nov 22, 2017 at 5:49 AM
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STEVE W.
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Well I do not like to give bad news but in all likely hood the chain guide(s) broke and the chain skipped teeth when the tension-er did not take up the excess slack fast enough. Very common on them. That engine is an interference engine design so at the very least it has valve/head damage.
To determine the extent of the damage the engine has to be opened up. Then you can decide about repair or replacement. With 205,000 on it I would probably opt for a re-manufactured engine if the rest of the truck is in good shape.
Nov 22, 2017 at 2:00 PM
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JOHN SANDERS2
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@Steve W - Thank you for your response.

I got the call from the shop just now. They discovered a bad fuel pump. $399 fix. Once it's fixed, I'm having them replace both chains and all components because the next time it WILL be the timing chain and the engine will be toast.
Nov 27, 2017 at 11:58 AM
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STEVE W.
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Well the pump is better than the chains but as you have a loose chain already it's a good thing to get done before it fails.
Nov 27, 2017 at 12:51 PM