Tacoma problems

I have a 1999 Tacoma 2we pre runner 2.7 and I just recently put another motor in my truck same motor out of a year newer truck and it ran fine in the other truck and it runs fine in mine but in th mornings when the motor is cold it doesn't want to crank at all it will eventually crank and when it does it runs great I just don't know what it could be

 

A good place to start checking is the battery in a no crank situation. Most stores that sell batteries will test it for free. If that checks out OK then I would look at the battery cables for corrosion and tight connections. Check the ground connections too.

 

Could be a problem with the engine temperature sensor? The sensor tells the ECU when to run a richer mixture of fuel to the engine. This used to be handled with a choke in the old days. Anyway, easy to replace it. That's my guess.

 

I don't think that's it because I can hook it up to a battery charger and still takes a while to start

 

Where is that sensor located

 

Here is a Youtube for a 2001. https://youtu.be/ESsI8N0wHpI

Here is an article about that sensor and the symptoms you'll see if it fails, notice many are similar to yours. Click Here

 

Thanks I'll try that

 

No crank means the starter won't turn the engine. No start means it won't run on it's own. Does it crank, but won't start? If so, you should put a scan tool on it. Most auto part chain stores do it for free. Just throwing parts at it is an expensive way to go.

 

It starts just takes it a while then after it warms up it starts right up

 

... sounds like a fuel issue to me.
As you said, you replaced the motor... perhaps a fuel line connection?

I'd start from the 1st fuel connection you took apart and work your way towards the fuel rail.

Hope this helps you, good luck.