0411 PCM usage Dave W. please comment

**rsicard** · 03-27-2015

Originally Posted by dave w

I'm not pissed off, I am busy person. I hold down a full time job, and operate a small EFi business. I enjoy helping others, but my employer / customers are a higher priority. I've considered upgrading my 93 K1500 to a 5.3 LS engine, mostly to increase my custom LSx wiring harness business.

For budget reasons, I would use the 2002 Express Van Vortec '0411 system on a SBC. I would avoid Drive by Wire. Everything for OBD2 tuning is expensive!

Troubleshooting is not easy. Troubleshooting over a keyboard can be very challenging! I don't like seeing someone waste time and money when troubleshooting. With an engine that is 100% original and 100% completely stock, troubleshooting strictly by the technical book is helpful. When an engine is not 100% original and not 100% stock, the individual doing the troubleshooting will usually require more troubleshooting experience than the technical book typically offer. Myself and other members here at gearhead-efi.com often share troubleshooting experience to other members.

It seems to me, you have more than one thing not 100% correct. I would focus on one problem at a time. I would configure the ESC (Knock System) to 100% factory stock wiring and parts. Usually having things configured like it was when it left the factory is a good plan.

dave w

Dave: Thanks for the comments. I will correct the issues encountered one at a time. Rerouted ESC wire away from spark plug wiring. inserted 3,3 Kohm resistor in the ESC wire to ground. Measured DC and AC voltages across the resistor. AC volts in the low milli-volt realm. Before was VERY HIGH AC voltage. Learning this, will route other sensitive inputs such as TPS and MAP as far away from spark plug wiring as possible. May resort to shielded twisted 3 wire to keep radiated noise way down.

An aside, read an article about EFI connection conversion of SBC with Gen III PCM, coils etc. The gist of the article was that separate coils per cylinder gives each coil time to settle electrically before next firing. Therefore, there is more spark energy released per coil yielding increase in TQ and HP. Interesting article.