Hi guys i have a 99 ford f150 4.6l v8. I swap the engine for another truck of the same year and same engine. Now it wont start. I change all the sensors for new ones. I have fuel and sparks. But still wont start. I dont know what to do. The engine cranks but it wont start. I need help please

 

Have spark and fuel!!! can't be a no fire.
What is the fuel pressure at the port while cranking using a pressure gage?
Are you positively sure spark is present?
Are the injectors firing?
Aside from the plug wire order being incorrect, there is no reason it should not at leas attempt to fire unless you changed the PCM.
We don't have anything to go on until you confirm the above questions.
Good luck.

 

I will check tomorrow, i will get back to you. The wire order is correct, i will check for spark again. I notice even when i spray starting fluid its still not start

 

Ok i found out that i have one of the coil not giving sparks at all. I have many coil, i tried to different one, but no luck. Might be electrical issues. I dont know where to start

 

Sounds like you didn't plug something in. I'm not a gambler, but I'm betting you didn't plug in the crank and/or cam sensor so the PCM doesn't know the engine is spinning.

 

One coil is getting power, the other one is not.

 

Getting power, or producing spark? Totally separate issues.

 

All i did was getting it to start. It was late last night. I will check to see if the coil is good, for the loss of power. When i get off work later i will check

 

It wasnt getting any power from the coil connector. I test it out with voltage meter. It was the driver side. It wasnt giving power to the coil, so the coil wasnt producing any spark.

 

Ok, i just put a code reader on it. Its reading six code. P0351, p0353, p0354, p0355, p0356, p038. These are all misfiring im getting. Going to check the coils

 

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Of course the PCM will set those codes because it does not see the coil 'current signatures' because there is no power to them.
Both coils get power from the same fused source through the PCM relay..
You damaged the harness doing the work.
The PCM relay is operating because the PCM is able to see the loss of coil power in order to set those codes.
There are at least 6 other sensors that take power from the same source as the coils.
See Haynes Manual page 12-21 for the layout.
All you have to do is inspect for damage and test for power at different points to see where the loss is, and how extensive.
Maybe wrong plugups have been made as well. It is possible
Good luck.

 

The truck is running better now. Its just hesitating on accelation. I think spark plug want gap. When the guy who did the work for putting the plugs in. I dont think he gap them, its an autolite spark plugs

 

The spark maybe wasnt gap correctly or not at all. I will check them. The gap for 99 f150 4.6l v8 is .54 if im correct

 

Ford modulars don't like anything but Motorcraft. Many have seen misfires just from plug brand including myself.

 

Im going to buy new plugs now. I will check out motorcraft, hopefully they not too expensive.