2004 Nissan Quest. Engine doesn't start.

There is no spark and the engine cranks but does not start, what could I do to figure out the problem? Is there a specific site that I could use for diagrams of the engine computer?

start with the basics no spark check inputs and verify it isnt caused by a security issue. Any codes present, no spark present on all coils?

I did a quick search and see that some of them have a VQ engine.
The Nissan "Q" engines are known for stretched cam chains. Check for spark on ALL the coils. If it's only sparking on 1 or 2 then it's likely a stretched cam chain.
I've seen quite a few of the Nissan with the issue, with the QR20 engine you can pull off the inspection cover and see the tensioner all the way out then you know it's all over.
Of course it may be something completely different and I'm wasting everyone's time

I just checked and I have manuals and diagrams for the Nissan Quest but the engine management file itself is 16 meg and the file limit here
is 5 meg. If you need it make contact and I can arrange for a file transfer.

Just saw this, but yes those manuals and diagrams would be great to have. Could you send through email?

No sparks on the front 3 but the back 3 I couldn't check

Message me your email address and I'll give you a link.

Thanks, here is my email.
lucibarbosaq@gmail.com

I've just sent you the "Engine Control" pdf. Check your email