Heh guys,
Can anybody give me some advice on how to perform an injector 'buzz' test. I just completed replacing head gaskets, ARP Head studs, complete cylinder head overhaul, updated HPOP STC fitting, etc, and cannot get the engine to fire. Engine builds plenty of ICP: up to 2500psi cranking. I checked all injector connectors/pins, as well as ground wire connection at FICM...all seems well? Fuel pressure from FASS builds 62-64psi..no problem there...?
I have popped the little cover on the top of the FICM and tested the voltage at the far right screw: about 8.5 volts... I dont think that is right...shouldnt it be around 45Volts? I turn the key on and I get no initial buzz at all from the injectors without even cranking the engine.... When I do crank the engine the tach goes up to about 400rpm. The batteries are fully charged and the starter is brand new.
Unfortunately, I do not own a scanner, as the SCT2 programmer I have doesnt read squat!
I have checked the power fuses at the fuse box on the fenderwell and none appear to be blown...? The three wire harness plugs to the FICM are spotless (I never disconnected them until now to figure out if there was an issue there...everything looks perfect.)
I have to say, I precisely remember before I tore the top of the engine down to replace the head gaskets while trying to diagnose why the engine died, I recall the injectors buzzing as I cranked the engine over checking ICP pressure. Now, I did at some point disconnect the ground to the FICM/harness at the back and continued cranking the engine over...would this have caused damage to the FICM?
So, to recap, originally, while testing my truck with my replacement tranny a month and a half ago the engine just flat out died and would only crank... I thought I diagnosed the problem as being the HPOP STC fitting, as it definitely was bad (leaking-ruptured internal o-ring) ...so even though I thought that was why it wouldnt restart...I decided to take care of the puking issue and all is done, but engine still wont run! lol :bang :bang
Any help MUCH appreciated!
Lenny
Can anybody give me some advice on how to perform an injector 'buzz' test. I just completed replacing head gaskets, ARP Head studs, complete cylinder head overhaul, updated HPOP STC fitting, etc, and cannot get the engine to fire. Engine builds plenty of ICP: up to 2500psi cranking. I checked all injector connectors/pins, as well as ground wire connection at FICM...all seems well? Fuel pressure from FASS builds 62-64psi..no problem there...?
I have popped the little cover on the top of the FICM and tested the voltage at the far right screw: about 8.5 volts... I dont think that is right...shouldnt it be around 45Volts? I turn the key on and I get no initial buzz at all from the injectors without even cranking the engine.... When I do crank the engine the tach goes up to about 400rpm. The batteries are fully charged and the starter is brand new.
Unfortunately, I do not own a scanner, as the SCT2 programmer I have doesnt read squat!
I have checked the power fuses at the fuse box on the fenderwell and none appear to be blown...? The three wire harness plugs to the FICM are spotless (I never disconnected them until now to figure out if there was an issue there...everything looks perfect.)
I have to say, I precisely remember before I tore the top of the engine down to replace the head gaskets while trying to diagnose why the engine died, I recall the injectors buzzing as I cranked the engine over checking ICP pressure. Now, I did at some point disconnect the ground to the FICM/harness at the back and continued cranking the engine over...would this have caused damage to the FICM?
So, to recap, originally, while testing my truck with my replacement tranny a month and a half ago the engine just flat out died and would only crank... I thought I diagnosed the problem as being the HPOP STC fitting, as it definitely was bad (leaking-ruptured internal o-ring) ...so even though I thought that was why it wouldnt restart...I decided to take care of the puking issue and all is done, but engine still wont run! lol :bang :bang
Any help MUCH appreciated!
Lenny