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Not sure why there's a pissing contest in here.
When doing a single wire, wire it to where your biggest consumers are wired so that it will sense the true load. Most of the time that's the big stud on the starter relay or a dedicated junction box you install. Do not wire to the battery without...
All I can add is I'm still using a 20 yr old classic fast sequential mpi efi and I've had to call them a few times over the years and they've always been willing to talk and let me send it in even though they don't officially support it for many years now. I haven't called lately however.
I may...
Wasn't the OP's problem but will second the check your cables. Original starter cable in my fury looked fine from outside, but had the same barely start when hot even with a mini. Turned out that cable was almost powered corrosion inside, the copper had disintegrated.
Yes they are suppression core and listed as copper with a spec of 5000ohm/foot. I didn't actually expect such a difference in the 2 wires. Whether it matters to my engine was the question but in this case $20 delta does buy a different product.
referencing this thread
https://www.forbbodiesonly.com/moparforum/threads/my-charger-seems-weak-this-year-part-1-ignition-system-check.220759/
based on what was available in stock I bought the classic yellow/orange boot Accel super stock suppression wires, replacing a set of Accel super stock...
it's got an orange box ECU and a MSD blaster 2 coil. They are both a decade old. I don't have spares of those to swap in quick unfortunately.
The plugs are clean, I was actually surprised they were 5's. It pings on 87 so I have to run 93 so I think you're right on staying with the 5's.
I did...
Trying to go through the subsystems to see if I can find the cause of a general weakness all around. So I started looking at ignition:
1. Cap and rotor do have wear but nothing I think should be causing problems. I'll probably replace since that's simple and affordable.
2. I tested continuity...
I've used a couple $35 minis and they've been just fine. I personally have a 383 and 2 440's with them, none of those blocks needed grinding. The 383/a500 combo is the one that the back side of the snout needed ground where the oe starter had fit.
The big thing to insure is that you have an ignition driver and coil meant to run at the same voltage, e.g. stock stuff running at 9v or aftermarket running at 12v, and then either ballast resistor or no.