I've posted this in internal engine too. But maybe someone in here can help.

The other day I did a H/C install on my car. This isn't the first one I've done on an LS1 car, but this is the first time I've ever had problems.

At first the car was just running rough & throwing a few expected codes except for a P0171 Bank 1 lean. I messed with it & messed with it, then finally gave up. I checked all my grounds, all 3 were hooked up on the drivers side head. The next day I fired it up & none of the gauges were working except for the Oil Pressure, Volts & Speedo, the car did start, but ran crappy again. I had no Temp, Gas Gauge, Tach, the ABS Inop light was lit, the Service Vehicle light was lit + a few others. The next day I went to fire it up & the battery was pretty much dead, I put my multi meter on it & it had about 8.5 volts in it. So I charged the battery & when I hooked it up one of my cooling fans came on, now the keys weren't even in the car & the motor was ice cold. So I disconnected the battery & then disconnected all the sensor plugs that I could get to. Then I hooked the battery back up & the cooling fan wasn't on. So I started plugging in all the sensors & injectors. When I plugged in the last injector which was #7 the damn cooling fans came back on, I put my multi meter on Continuity & when I put the probes in the injector harness on #7 it rang, like it was shorted.

I've been under the car, can't find where I might have crushed some wires under the heads when I installed them, no noticible crushed wires under the intake either. So I pulled the starter & didn't notice any chaffed or burnt wires either. The only wires I can remember maybe streaching were the wires to the O2 sensors on the headers when I dropped them.

Someone please throw some idea's at me while I still have the car up on jack's.

 

If you have no shorts, disconnect PCM connectors and check for corrosion and tightness. This is the same pcm correct? You cant mix all years pcms because they have different pin locations.

 

Well I think I found the problem. After tearing down the top end of the motor twice, & finding no shorts or pinched wires the car's still not acting right. I decided to check the weather pac connectors on the PCM, well the blue plug was full of water apparently from when I washed down the motor before I tore it down.

I'm going to take some air & a hair dryer & dry off the connector & see if that works. It's getting dark now, so I'll have to wait until the A.M. I am going to pull the computer & clean all the pins & check it for water too.

But I think that's my problem. Water in the computer connector.