Hi there,
To anyone that can help. I recently "finished" doing the swap and have been tinkering with it to try to make it work smoothly. Currently, I'm trying to figure out why it won't start right up when I crank it. It won't start until I spray some quickstart into the plenum through one of the vacuum ports. Once it's on, it runs fine. I hooked up a fuel pressure gauge to the fuel rail to monitor the pressure to make sure it had adequate pressure during crank. Sure enough, it was at about 40 psi while cranking, then quickly dropped back to zero within a second after I finished cranking. Once it starts, pressure maintains at around 40 psi. Can this drop in pressure before it starts be the source of the problem of why it won't start right up when cold?

I tried crimping the fuel line coming from the fuel pump and the return line to see where the pressure release was coming from. That didn't work... maybe I did it wrong?

Or can it be the MISSING/PLUGGED 9th/coldstart injector valve that is causing the problem? I was under the impression the 89's didn't need it. When I got the tpi conversion, I was told it came off an 89 IROC, but the fuel rail had the valve port on the drivers side like the 85-88's so I plugged it. The fuel rails don't have the open port on the drivers side, so I'm assuming they're from the 89. Basically, how do I know if the ECM is sending a signal to all 8 injectors rather than the BYPASSED 9th while cranking during cold start? Should the ECM be sending such a signal. I've read the 89 MAF system was the only year it didn't use the cold start valve. It still used the same 'puter as 85-88, right? (01227165)

Please someone help me figure this thing out... I want my van to start right up the first time everytime!!!!!!