Quote from stevant on July 10, 2019, 11:53 pm

I’ll try to keep this short.  I am building a Cobra, simple electrical system.  Engine is grounded to the frame, frame is grounded to the battery.  Harness is grounded to the frame.  I installed my 351w last September and had a successful start with no issues.  I started the car periodically and even completed a few go cart drives........until a week or two ago.  I am running a Pertronix Ignitor II distributor and a Flamethrower II coil.  I have less than 0.2 ohms from my ignition module base to my negative battery terminal as per Pertronix specs and 11.6 volts to my coil under load.  All good to go ignition wise.  I have 12 volts going to my white wire and have shielded my blue tach wire with ground as per the forum suggests.  My Fitech took a dive last week and was sent back and repaired under warranty as the ECU failed.  It is now back in my car and I’m simply trying to make sure my RPMs are consistent and not all over the place like they have been recently.  I figured the shielding would have eliminated this but was told by Fitech that my tach wire from my gauge is interfering as it shares the same negative post on the coil.  My RPMs are all over the place at cranking.  174 up to as much as 3000 and all in between,  I removed the tach wire from the coil and cranked her again and I had a consistent 174 at cranking.  Great!!!!!  Thought I was getting somewhere.  Tried it again and it’s all over the place.  Although she was running good a while ago I’m feeling confident my RPMs have always been inconsistent.  I only get a fault code once in a while but never consistently.  I thought removing the tach wire from the coil was the solution. I was going to run a diode on it to remove and back feed but that had not fixed my issue.  My coil is up front on the block, another suggestion was I move it?  This is really frustrating as if it was not for me stumbling on this forum I would be no where.  Thanks for all who support and help people like me get through these issues.  I’m changing my ignition module thinking maybe that is causing the coil inconsistency............ pulses determine RPM, module determines pulses.  Trying to address all possibilities but there are so many gray areas it’s hard to find what’s causing my RPM spiked as my fuel control is based on that.  I have been having flooding issues since all this started.  My plugs fouled, my distributor cap had arced inside.   It’s a mess, all brand new stuff!  I need a little direction please.  I’m going to try and attach some pics..