Ok, I'm new as you can tell. I don't have a LOT of experience with fuel injection or computer controlled cars so bear with me while I ask a few questions.

1. When the hell does the fan come on? I started it up and waited a good thirty minutes while it idled on a 95 degree day (~30 Centigrade) and the temp gauge never moved above half way and neither of the fans came on. The reason I ask is because this car had some front-end damage and I want to make sure that everything works properly.

2. What's with the coolant line going into the throttle body? Wouldn't that make the intake hot and hurt performance? In my F-body club (camaros and firebirds) in Virginia we capped that off as a "free mod" to help make the intake charge cooler and denser, should I do the same thing here? I live in Texas so winters aren't really that bad.

3. Bear with me here. On the passenger side of the fuel log is where the pressurized fuel feeds into the log, what is the little vacuum controlled valve on the other end of the log? What does it do?

4. IACV and FITV, where are they so I can clean them?

I guess that's it for now, I know these are n00b questions, but you have to know how it works before you can make it run like your other car.

 

1. It takes a while. Try holding the RPM at ~2000. Might help build some heat in the motor.

2. That coolant line helps heat the air going into the engine, yes, but unless you are looking for utmost gains, at low RPM, thus low air velocity, it helps atomize the fuel better, keeping it from condensing and sticking to the intake manifold surfaces. At high rpm though, it does hurt performance thanks to increased air temps.

3. The vacuum operated valve is the fuel pressure regulator.

4. If you car has an FITV (not all do), it is bolted to the bottom of the throttle body. The IACV is bolted to the intake manifold plenum, front or rear, depending on the model.

 

The coolant hose going to the air intake is there for fast idle thermo valve. When the engine is cold the valve opens for more air flow to the engine. When the engine warms the valve closes to reduce air flow. Its not there to warm the intake air.

 

yeah, that's what I figured, I know it's purpose isn't to warm the intake charge air, but it still does, I'll leave it how it is.

Thanks! I ran her at 2000 RPM for a few minutes and the primary fan finally came on, now I can drive it with the confidence that everything works properly.

I'm not used to these cute little aluminum motors, usually it takes about ten minutes to heat up my iron small block so I guess I was just worrying about nothing.

Thanks for the info!

 

Some motors do not come with FITVs, yet still have the coolant lines to the throttle body. It is in fact to warm the TB in cold winters, along with help atomization.