The wiring was so far gone that I would rather just reconnect and label everything. What I need is a engine bay wiring diagram for the '89 4.2 L (auto trans) with Howell TBI and HEI. I have the off road Howell kit as I do not need emissions equipment and I want to eliminate everything that is not necessary.. Howell has even built some really long harnesses that allowed the user to mount the computer in the trunk out of the way. Every harness Howell makes is customized for your application. We asked them why they don't make a basic "off the shelf" wiring harness. "Every single engine is different with different requirements.
Howell Engine Developments parts list. Howell harnesses are equipped with labels for all connectors, relays, sensors, etc. They are laid out to fit most common engine arrangements. When possible, engines should be installed with conventional exhaust manifolds and air cleaner, retaining the exhaust heat to the air cleaner from the exhaust manifold.. Portions of the dash and glove box needed to be removed so we could access the factory ECM and wiring harness. The instructions from Howell forewarned us that we would need to make room behind the defrost duct work in order to get the factory wiring harness out, and the new one in.. There was also an existing plug in the engine compartment.