Please help... Engine turns over but wont start

[HighCotton82]

Anyone have any ideas on this one....

I have an 02 Merc Mountaineer that through a rod, broke a spring, and destroyed my head. After sitting for about 6 months I purchased a re-built engine and have finally installed.

My initial problem was a stray vacuum line, which I cannot find a home for, but I don't think that is my biggest trouble. After the initial installation the engine was running, but just a little rough.. I thought this was due to the old fuel and the vacuum line, but after a test drive the engine died. The engine acts like it wants to crank, but won't fully get going for more that a few seconds and requires the gas to be wide open. Since this, I have done the following in an attempt to get her running again:
-siphoned all the gas I could from the fuel tank (still 1/4 tank left)
-replaced the fuel filter
-gapped the spark plugs correctly and validated spark
-verified correct fuel rail pressure
- verified injectors were not clogged (not recommended, but I was getting desperate)
-change IAC vlave
-checked PCV valve and hose for leak
-attempted to start without MAF sensor

On a side note, when I went to check the injectors I replaced the manifold gaskets again and put everything back together... The engine started right up again at first and then I turned the engine off to do a few tweaks so I could take it for a test drive... Now I'm back to the same problem...

ANY IDEAS??? I am completely out of ideas, time, and money. thanks-

_

 

[sxlvr]

Have you checked the fuel pump?

 

[HighCotton82]

Still lost

Thanks for the reply... I can hear the fuel pump coming on, and I checked the fuses. I haven't taken on the task of dropping the gas tank to get to fuel pump. I assumed the fuel pump was good if I was getting proper fuel pressure to the rail line, but I know I shouldn't assume.
Is it possible that the fuel pump could still be the culprit?

 

[Robsbrd99]

Is the egr valve connected?

 

[patrick112390]

Thanks for the reply... I can hear the fuel pump coming on, and I checked the fuses. I haven't taken on the task of dropping the gas tank to get to fuel pump. I assumed the fuel pump was good if I was getting proper fuel pressure to the rail line, but I know I shouldn't assume.
Is it possible that the fuel pump could still be the culprit?

crankshaft position sensor?

 

[HighCotton82]

EGR Valve

Yep - I double checked and the EGR valve is connected... On to the next possibility I guess... Thanks though

 

[zerodevil]

can we get a picture of this homeless vacuume line? i did an engine swap in my 03 and could be of some help to you.

 

[jrford]

any security light flashing, PATS II key lockout?

 

[zerodevil]

engine wouldn't turn if it was pats I think.. I'd like to see this vacuum line.