Testing a 4.0l motor.

[tvic54q]

Hello. I swapped a 4.0l with a 4.0l due to one motor being siezed. Did headmaster timing chain components hi flow oil pump.
Got the bare motor installed. No accessories. Whats hooked up is the fuel injectors the coil pack harness the starter the fuel line and fuel pump. I ran a ground from a jumper cable to the block for a temp ground. Motor turns over but wont start. Any I missing any other crucial connectors a ground im overlooking...
Timing has been set multiple times via cam shaft synch and timing chajn was verified correct before sealed up.
Yes compression yes spark and have 50 psi at the fuel rail... does the fuel rail damper need to to be connected to vacuum? Any test i can do fuel injector or fuel rail wise?

 

[gaz]

@tvic54q
Go-nogo test (50/50 test)

Determine it it will run on starter fluid:
• if it runs on starter fluid, you have a fuel issue
• if it does not run on starter fluid, you have an ignition issue

 

[Shran]

It needs to see a crank position sensor signal to start and you need the ECM/ignition control module/other sensors connected too. I guess I am not understanding why you wouldn't just hook everything up?

 

[tvic54q]

It needs to see a crank position sensor signal to start and you need the ECM/ignition control module/other sensors connected too. I guess I am not understanding why you wouldn't just hook everything up?

Well after the rebuild on a separate motor all the accessories need to be swapped. So none of those are in.... dont wanna install the water pump alternator or anything else if the motor wont run. Ecm is hooked up so it the coil pack and fuel system is guess is there a ground somewhere for the ecu that i may have missed.

 

[tvic54q]

@tvic54q
Go-nogo test (50/50 test)

Determine it it will run on starter fluid:
• if it runs on starter fluid, you have a fuel issue
• if it does not run on starter fluid, you have an ignition issue okay thanks. I understand the fuel issue and troubleshoot... anything I might be missing as far as needing to be hooked up

 

[gaz]

@tvic54q
To be 100% clear, this test with starter fluid MUST be performed...you did not state that you tried to start it with starter fluid.

 

[Shran]

If it starts off starting fluid then you know you probably have an injector issue. If it doesn't, there is no spark or the timing is way off.

You can test the injectors while cranking with a test light, just unplug one and attach a test light to the plug. Crank and it should flash. Spark test is easy, pull a plug and set it on something you know is grounded and crank, watch for spark. Or buy an in-line spark tester, they are like $5 at Harbor Freight and pretty handy to have.

 

[tvic54q]

Thanks for the troubleshooting tips. But are there any other grounds I maybe overlooking? Does the fuel rail damper need a vacuum line to provide fuel or could the lack of vacuum on the damper cause a deadhead.