No Spark at 2 coils
Is the RPM wire to the throttle body run separate to the rest of the loom, shielded for its full length [I used steel braided tube] and earthed on one end? Do you have an earth from the unpainted mount lug of the TB [I think front LH] direct to the battery? Both are necessary.
The throttle body is anodized and there is no bare aluminum area near any of the bolts that hold it to the manifold. Regarding an RPM wire, the throttle body has a throttle position sensor and an Idle Air Control module neither send an RPM signal, that comes from the cam sensor and crank sensor. The throttle body should not need a ground on the Ultimate LS System.
Well Fitech finally tested my ECU after it sat at their place for 3 weeks and it was fine. After a leak down test I found air coming into the intake when both valves were closed. This would cause the AFR to go crazy. Took one head off to find all the intake valves were bent caused by a cam installed wrong. Removed the motor to go through everything especially the cam. New intake valves and a cam setup properly, the engine is back in the car. I re-flashed the ECU to start over with the Initial engine setup and now the engine won't stay running, starts some times but dies immediately. I have been adjusting the throttle blade to see if that helps, no luck yet.
Sorry to hear of your valve problems. The timing chain was installed off a few teeth?
Did you solve the problem of no spark from two coils?
For your start but dies problem, do you have a fuel pressure gauge on a fuel rail? You need to watch the fuel pressure as this is happening.
The timing chain set has 8 different key ways on the crank gear to advance or retard the cam. It came with no instructions and my setup was flawed, had I checked cam timing after I installed the timing chain I would have caught the error.
I fixed the spark at the 2 coils by replacing the plug wires.
I have a fuel pressure gauge on the regulator on the return line, which I can't see while cranking the engine. I should plumb another gauge that I can see while cranking the engine to make sure the pressure is holding.
Thanks for the advice.
After several sessions attempting to start the motor failed I decided to pull to motor out again. The reason I pulled the motor out was to check the crank reluctor ring position. Since I have a stroker crank a 24 tooth ring was installed by the shop that sold me the kit. They also balanced the assembly for me.
The ring was installed in the correct position so I checked the run out on the ring since I read that a bent ring will cause issues and sure enough it was bent. Must have happened during shipping and I never noticed it during the initial assembly. My dial indicator showed the ring to be .030 out and the factory spec is .010 max. Since it was a Sunday I decided to straighten out the ring myself knowing that I could get a new one the next day if I screwed up the one on the crank. I managed to get the ring within .010 with just a few adjustments without loosening the ring on the crank.
After putting the motor back in the car it still would not start, acted like it wanted to fire but not enough to keep the motor running even with the throttle screw almost all the way in, so I replaced the crank sensor with the one that came in the used block I started with and bought a new Ac Delco cam sensor.
Motor fired and ran with a high idle since the idles screw was in so much. I backed out the idle screw and now the RPM is stuck at 1280 RPM with the screw almost out all the way. I will work on the IAC adjustment to get the idle down to 900 RPM.
I did notice that the RPM on the hand held is about 500 RPM higher than my Autometer Tach, not sure why this is happening but will get the IAC adjusted before changing any other settings unless someone knows why the RPM is different on my tach.
The motor runs and I can get the car back on the road again while I work out these other issues.
Lesson $15 cam and crank sensor may not be a good deal. They are all made in China so it must be the strength of the magnet in the sensor that is the difference.