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.

 

[tvic54q]

Like the alternator ac etc doesnt need to be plugged in to start.
I have ecu
Coil pack
Injectors
Cps -new
Cms
All elect to upper intake connected and disco start attempts
Ground is jumper cable from.block to chasis
Am I missing anything critical?
Some magic connector i missed?

 

[tvic54q]

Up date.... plugged everything i could except the ac and power steering.
Checked compression on all cylinders
Cylinder 4 was at 60 which I know is bad. The rest were 120 and cylinder 5 was 150
Verified spark.
Attempted "cold start" no fuel with starting fluid.... she popped like she was gonna fire.
Hit her again same sounds rapid gun fire
Install fuel pump fuse
Attempt start rapid gun fire by standard cranking noise.

Standard cranking noise became the norm... and even with no fuel and cranking so there's nothing coming out of the injectors next cold start.
And after repeated c.s. resets rapid fire by standard noise.

Im wondering if the c.s. senor itself is bad like the sensor looses itself

 

[gaz]

@tvic54q
When I try to start an engine with starter fluid, ideally there are 2 people. One person opens the throttle while spraying starter fluid straight into the open throttle body while person #2 turns the key to start the engine

If no assistant is available, I have the keys in the ignition, door open then give a good 3-4 blast of starter fluid straight into the throttle manually opened body (while holding the butterfly wide open) then run to the key and twist it...

Either way, if it starts = fuel issue, if it doesn't start = ignition issue.