The injector upgrade was another mtman inspired project. Here is his detailed thread on the subject:viewtopic.php?f=22&t=77480
The stock multec 1 injectors are a wet coil design and have been known to degrade when exposed to ethanol fuels. Nearly all gas these days has some ethanol in it so i figured an upgrade would help to future proof things. Plus I had symptoms of leaking injectors already like hard starting and occasional backfire into the intake. Once bad enough to scorch the air filter.
The upgrade is delphi style multec 2 injectors, conveniently used in Izuzu 3.5L Troopers and Rodeo 3 2 and 3.5L.
I pulled these from a junkyard truck. I actually pulled several extras. You could buy new or rebuilt and tested ones, but I rebuilt my own. I bought rebuild parts from mrinjector for about $35, with enough parts for 7 injectors. For cleaning to start I dunked them in a can of Chemdip for a few days. I then pulled the screens and sprayed them out with chemtool cleaner, making sure to let any debris run out the top of the injector not further in. With the new parts installed I put each injector into a jig i made for pressure cleaning. One rubber tire valve stem with valve core removed, valve cap with a small hole drilled in the top, glue one cleaning tube from the carb cleaner can into that hole, then slip the valve stem onto the top of the injector. I used a connector and some harness to connect power to the injector, and wired it through a guitar amp foot switch to keep my hands free. Use the bare minimum voltage needed to get a click out of the injector. I ended getting two AA batteries to work after starting with a 9v power adapter.
Hook the tube to a can of carb cleaner, spray some, then pulse the power to the injector to spray it through.
The spray should come out evenly and a very fine mist. Keep in mind atomized carb cleaner spray can be seriously flammable if not explosive. Outdoors would be the best place for this. All 7 injectors i rebuilt had good clean spray patterns. I can't say if they all had the same flow rate, but for the price they have worked very good. It might be better to just get a set cleaned if you don't want to mess with this clean and rebuild process.
They fit right in place of the stock injectors and the safety clips even match up.
The whole package looks like they belong there.
The wiring i just cut connectors from the donor and soldered but there are adapters available that are plug and play for the factory harness to the new injectors.
Overall these injectors seem to have improved throttle response and cured all of my hard starting and backfire issues. But I had very likely bad injectors to begin with so any performance comparison is going to be hard.
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