Thread: Car wont run correctly

You have to be careful about what you cap off on the intake manifold. There are ports in the manifold that direct air before the throttle body into the IACV. Best way to determine which ones should be hooked up on the manifold itself is to look at the FSM or pull off the IACV and blow some air through a tube to get an idea of where the port on the manifold is routing too.

General idea is that the IACV needs to draw air after the MAF (so the air needs to be metered) and before the throttle body. All it does is make small adjustments in the air going into the intake manifold, but to get it perfect, the air going into the IACV must be metered. It doesn't matter if you're boosted or not this is how it should always be set up.

Messed around with it some more today. Set the timing correctly to 15 deg. Still the same issues, also checked for proper operaton of the iacv and it seems to be working correctly. Next i decided to try a stock ecu and see if that would run the car better than the jwt ecu and it does actually much better. The car idles on its own and doesn't die when you come to a stop. So i am thinking i have a bad tune from jwt.

I think i am going to send my ecu back to them and have them go over the program to see if there are any issues.

Wow this is turning into one of the longer idle issue threads as far as date goes. Figured out two major problems with my car yesterday. I had the wrong injector resistors and they were also wired up wrong. I really don't know how the car ran at all the way it was. Fired up first try and idled on its own after fixing the resistor set up. My next step is to set the tps voltage range and then get the timing set properly.

I was trying to get the tps set yesterday but having issues and wondering if there is a wiring diagram for the 3 wires going to it as it. I want to make sure they are wired correctly as at one point i had cut and spliced on a different connector.

Any help wold be greatly appreciated.