Re: One last shot... Breaking up!
You have an electromagnetic interference problem (EMI). Ignition systems are notorious for emitting copious amounts of electromagnetic energy under the hood. This energy bounces off sheet metal in the engine compartment and goes all over the place. Wires going to and from sensors can couple in this energy (just like an antenna receives radio waves) and inject current and/or voltage where it isn't supposed to go. These current or voltage problems are seen as false or bad data to the pcm. Check your wires and make sure they are as far as possible from your coil and plug wires. If there are any goofy loops they can couple energy more efficiently (something you don't want). This would explain why you have certain RPMs where these problems occur. They are resonant frequencies of the circuit or loop that is picking up the EMI.
If you cannot find the culpurit circuit you have to do some shielding. Corvettes in the 70's had a metal braid around the plug wires that was grounded to sheild EMI. Todays wires are designed to suppress EMI, but there are no guarantees from the manufacturer how well they perform.
:woot:
I can see your train of thought on this one.... Matt doesn't have any bad data showing up in his data logs, though.... except what looks an ignition module issue on one 'startup' log.
EMI is typically up in the really high frequencies and has a hard time coupling much energy unless you have a big coil of wire wadded up somewhere. I can see a primary emitter having potential in this case, but certainly not secondary emitters. And it is good to keep all those potential high voltage wires isolated.
Those Corvette sheilds were mainly to provide shielding for the radios.. the fiberglass bodies allowed the EMI to radiate directly into the chassis of the radio.
I don't know, you could be right, but I'd be really surprised if it were the case... keep adding to the ideas though..... we're just about out of them!
![Quickstop [UK]](/data/avatars/m/5/5165.jpg?1570199786){kind=avatar}
