2003 Expedition not starting
Logistics Pro
Joined: Jan 2001
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From: Central NYS
I suspect your chain has jumped a tooth or two.
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bad oil pressure wont prevent start, though it could increase wear on the engine which leads to bad compression. But, you also get bad compression from wrong timing. If you redo the compression test, first dry then a wet test, meaning squirt a little engine oil into the cylinder then do a new compression test and see if it changes. This is one way to find out if the bad compression is due to worn rings or if it's the heads/valves. Check also other cylinders to see if the compression is the same on others. Any compression under 100 psi would be below spec.
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bad oil pressure wont prevent start, though it could increase wear on the engine which leads to bad compression. But, you also get bad compression from wrong timing. If you redo the compression test, first dry then a wet test, meaning squirt a little engine oil into the cylinder then do a new compression test and see if it changes. This is one way to find out if the bad compression is due to worn rings or if it's the heads/valves. Check also other cylinders to see if the compression is the same on others. Any compression under 100 psi would be below spec.
I'll redo the compression test tomorrow. I think it's out of time also because of the backfire from the throttle body. But is it possible that It got out of time without me knowing it? When everything first happened it was all really smooth. No jerking or running bad.
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Posting Guru
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Impossible to say, weird things can happen. The only way to find out is to identify if it's rings or heads/valves, then take the valve covers off to inspect the chain.
Not sure if it has cam sensors since it's a 2v engine without cam phasers, but if it does have cam sensors you can use a scantool to check if the timing is correct or not. It may require a higher grade scantool than your typical DIY scantool.
Not sure if it has cam sensors since it's a 2v engine without cam phasers, but if it does have cam sensors you can use a scantool to check if the timing is correct or not. It may require a higher grade scantool than your typical DIY scantool.
Logistics Pro
Joined: Jan 2001
Posts: 3,740
Likes: 37
From: Central NYS
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