This is a perfect example of someone who thinks they know what they are doing but cause more damage.

I bought this Blazer about a month ago. Great condition (to the naked eye), but someone decided that it would be a good idea to bypass the ecu and mount a Weber where the throttle body should go. Runs fine to about 3000 rpm then starts coughing. I tried to get the injection to work again but there is no signal to open the poppets.

Now everything electronic is going one by one. The keyless entry wont work and won't allow programing, the electronic 4wd stopped working, the interior light and rear hatch stopped working (sorted that out) and now I found that if I remove the wiper fuse the engine idling speed increases.

Anyone have any idea what is going on here?

 

Sounds like a rats nest... You are basically going to have to go through the wiring, wire by wire, and make sure that everything is going where it is supposed to go and that all of the connections are clean. This goes for ALL of the wiring in the engine bay plus under the dash.

Have you returned everything back to stock? Do all of the connections under the hood have a home (ie sensor/device that they are supposed to plug into)?

Given the circumstances, there is likely very little that we can help with. We do not have the ability to inspect your vehicle and tell you what is right and what is wrong. Since you have to be our eyes, ears, & hands, if you don't know what is right or wrong, it will be very difficult to work through this problem.

 

I downloaded a wiring diagram and checked all the wiring. Everything seems to be ok and all the sensors are plugged in. The only thing I do see is that the unit under the center of the dash has been taken out. I assume this is the keyless entry because it has not worked since I bought the Blazer and the security light stays on.

I have returned it to stock and connected everything that needed connecting, still no signal to the injectors and fuel pump. There is spark but I assume the firing module and coil have been connected straight up to the ignition

 

The RKE module is located on the lower hush panel above the accelerator & brake pedals just behind the DLC (data link connector). The BCM is located in the dash at the center of the truck. The truck will not run without a functioning & properly programmed BCM.