4.3ltr TBI Motor Swap

Scott, what radiator, and fans are you using?

 

Hang in there bud. You're almost there. Looks good from overhead. In fact, it almost looks like a neater or cleaner engine compartment, overall.

 

It's a three row V-8 Chevy Monza radiator with two 12" electric fans.

 

I try to make it look like it came from the factory.
And thanks. I appreciate you noticing my work.

 

Seems I have something wrong. If I disconnect the wiring harness from the motor and connect the battery. The fuel pump starts like it should. If the harness is plugged in, the fuel pump doesn't start. I've been studying the wiring diagram. I know I have the wires in order. Maybe the ground wires are the problem. I'll research that next.

 

Check and see if the fuel pump power is run through an oil pressure switch.

The key in start position bypasses the oil pressure switch.

Kinda like the resistor in a points distributor wiring.

 

Is there a fuel pump shut off switch somewhere? Like the switch that kills the pump after an impact (accident).

 

I got the Jeep running today. It was a bad ground at the fuel pump relay. I also had a problem with the transmission locked up. Seems I pulled the shifter out when it was in reverse. I still need to get it over to the exhaust shop so I can get the 02 sensor in the pipe. Don't want to throw a code.

 

post up a pic of the o2 once installed for me please!

oh and it's not running till it's on camera

 

I was going to take a video. Then my phone died.

 

Good news, Scott. Glad you got it. Looking forward to video and further posts on the project.

 

So. Sorry to disappoint you guys, it didn't start today. Not sure what it is.
When I got home today. I was adjusting the clutch and noticed the o2 sensor was hot and key was off. I thought that wasn't right. Found, what I thought was ignition feed. Turned out to be powered all the time. Fixed that. Still no start. Then while checking the tail lights. I found I wired that wrong. Fixed that. Then I put back on the soft top. Now the Jeep is finished. Just need to diagnose the no start. Maybe I can get my Brother the ASE Master Tech to come over and help me. Seems he doesn't like to work on cars when he is not at work.

 

I talked to my Brother last night. He thinks that without the ho2 sensor in the exhaust. The motor flooded itself and now isn't starting. He suggested to have the exhaust put on so the ho2 sensor is in the pipe. Because without it. There is really no way to diagnose the problem.

 

the o2 is only calculated once the coolant temp is in the normal range, the o2 is not used to start (it only reads the gasses of burnt fuel) it cannot read gasoline
the engine will only throw a code for a failed 02 (It will run, but not closed loop.)
check with a timing light, read the plugs and check firing order, verify the basics.

 

When I put the pump in the tank. I didn't even think about a fuel pump check valve or is this something that is built in to the pump?

 

I got the fuel pump working. The circuit works perfect now and it still not starting.
I checked to see if I am getting power to the injectors. I do, but they don't trigger. So I went to my Factory Service Manual to find the procedure for checking the injector circuit. It's not in there. I see 4.3L TBI (VIN Z) INJECTOR CIRCUIT DIAGNOSIS. It is for a motor that has a PCM. I don't have a PCM. I have a VCM. (Just my luck they had both for this year.) This book doesn't have that procedure.
Ok. I'm not sure what is wrong.

I did get my Speed sensor today. It's installed. Tomorrow at 10:00 am is my appointment for the exhaust shop. Would of liked to get it running by then. Guess that's not going to happen. Guess I'll be towing it there.

 

Found the elusive page. I did a few more tests. Looks like my Ignition Control Module is bad.

 

New module and still it doesn't run. I had the exhaust installed today. I had to use my winch to get the Jeep up on the lift. At least the exhaust is done.

I know this is useless without pictures so here you go.
Driver side.


Passenger side.


Cross over pipe.


o2 sensor.


New muffler. Could of used the old one, but this one is quieter. It's a Magna flow.


Speed sensor.

 

Look'in good scott, as far as the crank no start conditon have you checked for spark both at a plug wire and at the coil wire? As far as the injectors and fuel system a good quick check is to take a test light connected to batt. +, disconnect the 4-way distributor connector and with the ignition turned on momentarily touch the connector at ckt #430 (pin c, ppl/wht wire). Each time the test light is removed from the terminal the injector should spray. If the injector sprays the fuel system is good. Hope this helps

 

I think I might of fried the VCM. I read in the Service Manual. (IMPORTANT. To prevent internal VCM damage, the ignition must be "OFF" when disconnecting or reconnecting power to the VCM.) I think I might of done this. I'm not sure what to do now. Think I need a VCM.