4.7 rebuild. Crank no start.
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I talked to a mechanic I know and he said that the numbers won't be where they should be until I get a few heat cycles and good oil pressure since I had the valve job and new lifters. Everything I have search on the subject also says that compression will be low on fresh rebuild until rings have a chance to seat.
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OK so we are getting somewhere. You've got fuel. You've got air/compression (I agree with your friend on lacking ringseat yet). You "should" have spark - 5to7 volts while cranking on a digital meter is 47-66% duty cycle assuming Vbatt is 10.5 volts. I would expect closer to 12% duty cycle.
Coils should be hot at all times, ground should only be present for a very short amount of time to fire the coil before starting the re-charge process.
Fuel Injector hot-side comes from PDC-C106 via Splice 187
Ignition coil hot-side comes from PDC-C106 via Splice 187
Since we know you have fuel, we know you also have hot coils. We can only assume the PCM is grounding them to fire. Unfortunately it's hard to test a COP coil because you can't just hold the spark plug against something metal and tell somebody to turn the key. [Note: You can, but wear gloves. Ideally you want to use a spark plug tester that encapsulates the spark for safety]
So next question - Did you reconnect the ground strap on the back of both heads?
With the scanner connected and cranking, can you see the cam/crankshaft counts increasing? Can you get to the test screen and manually fire the coils?
Coils should be hot at all times, ground should only be present for a very short amount of time to fire the coil before starting the re-charge process.
Fuel Injector hot-side comes from PDC-C106 via Splice 187
Ignition coil hot-side comes from PDC-C106 via Splice 187
Since we know you have fuel, we know you also have hot coils. We can only assume the PCM is grounding them to fire. Unfortunately it's hard to test a COP coil because you can't just hold the spark plug against something metal and tell somebody to turn the key. [Note: You can, but wear gloves. Ideally you want to use a spark plug tester that encapsulates the spark for safety]
So next question - Did you reconnect the ground strap on the back of both heads?
With the scanner connected and cranking, can you see the cam/crankshaft counts increasing? Can you get to the test screen and manually fire the coils?
#20
OK so we are getting somewhere. You've got fuel. You've got air/compression (I agree with your friend on lacking ringseat yet). You "should" have spark - 5to7 volts while cranking on a digital meter is 47-66% duty cycle assuming Vbatt is 10.5 volts. I would expect closer to 12% duty cycle.
Coils should be hot at all times, ground should only be present for a very short amount of time to fire the coil before starting the re-charge process.
Fuel Injector hot-side comes from PDC-C106 via Splice 187
Ignition coil hot-side comes from PDC-C106 via Splice 187
Since we know you have fuel, we know you also have hot coils. We can only assume the PCM is grounding them to fire. Unfortunately it's hard to test a COP coil because you can't just hold the spark plug against something metal and tell somebody to turn the key. [Note: You can, but wear gloves. Ideally you want to use a spark plug tester that encapsulates the spark for safety]
So next question - Did you reconnect the ground strap on the back of both heads?
With the scanner connected and cranking, can you see the cam/crankshaft counts increasing? Can you get to the test screen and manually fire the coils?
Coils should be hot at all times, ground should only be present for a very short amount of time to fire the coil before starting the re-charge process.
Fuel Injector hot-side comes from PDC-C106 via Splice 187
Ignition coil hot-side comes from PDC-C106 via Splice 187
Since we know you have fuel, we know you also have hot coils. We can only assume the PCM is grounding them to fire. Unfortunately it's hard to test a COP coil because you can't just hold the spark plug against something metal and tell somebody to turn the key. [Note: You can, but wear gloves. Ideally you want to use a spark plug tester that encapsulates the spark for safety]
So next question - Did you reconnect the ground strap on the back of both heads?
With the scanner connected and cranking, can you see the cam/crankshaft counts increasing? Can you get to the test screen and manually fire the coils?
I did reconnect grounds to the heads. Also the grounds to the passenger front/lower block. I am also contemplating adding additional grounds just to eliminate that possibility. I will run the tests on the scanner you mentioned in the morning. Work gets in the way of my tinkering.
Thanks again for the help. You are saving me from just lighting a match and walking away.