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  1. mrgto

    88 350 TBI ECM Electrical ?

    Hey Guys, It's actually an '87 350 TBI. I'm in the middle of trouble shooting my motor. When running Tunerpro RT, it shows that the Battery Volts are low. well under the 13.5-14v that my voltmeter is showing off the alternator. I have an aftermarket 12v Gauge and it's showing what my...
  2. mrgto

    88 350 tbi. AC signal to ecu?

    I've thought of this, but not sure how it would hook up on a tbi system
  3. mrgto

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    I wanted to thank everyone for their input, you guys really helped me out big time! Chengny, you especially! Selflessly taking the time to help educate a fellow wrench turner. Your last post gave me the Ah-ha moment. Those wiring diagrams were confusing the hell out of me. I pretty much...
  4. mrgto

    88 350 tbi. AC signal to ecu?

    I have a custom project I've been working on. I installed a new engine wire harness and eliminated all electrical/ wiring that is not associated with the operation of the motor. One of the things I'm looking to accomplish is a way to increase the idle on the fly. Reason for this is I'm...
  5. mrgto

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    Wow, it's crazy, as soon as you said the line splits the two I immediately saw it. The left side is the female side of the "plug" looking at it from inside the cab. mirror image of the BHC on the firewall. now that I see it, it all makes sense now.
  6. mrgto

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    The arrow was meant to be pointing at the entire diagram that looks like the BHC. Maybe I'm looking at this wrong. I see two "BRC" one labeled "engine" the other labeled "I/P" The one Labeled I/P looks like the BHC on the firewall... What does the the one on the left, labeled "engine" and...
  7. mrgto

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    Ok, that makes a lot of sense. I was thinking about bypassing the BHC because of the shape of those wire terminals, but then after doing some online research after I made the post I saw I can pickup the GM 56 terminals at the NAPA right up the street. So I'll be removing all the wires to...
  8. mrgto

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    this is confusing as well. On the Hot Fuel Wiring Diagram, it shows the bulkhead and to the left of the Bulkhead image is another what appears to be another type of bulkhead point. I marked it in the image. the tan/white wire that comes out of the bulkhead at "G3" it's not shown on the...
  9. mrgto

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    Ok, that confused me even further lol. Here's a question. With the new ECM harness it comes with the Fuel Pump Relay. It has one wire that connects to the Tan/White wire from the old relay. I traced that wire through the old harness, it then splits off to three tan/white wires one of them...
  10. mrgto

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    Hell yeah!!!! This is exactly what I needed! Now I know why I was getting confused. the Bulkhead on the diagram is shown 90 degrees counter clockwise. I really Appreciate your help with this! I'll post some photos of the work I've done..this weekend.
  11. mrgto

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    Thanks again! Posting the image of that clean Bulkhead really helped. Here's what I have: L wire - A1 = HL switch (main beams, tail/parking/marker lts, crtsy/dome lts) & BATT bank of fuse block - far left The Black Wire paired with L goes to what looks to be C4 Disregard the 2nd Wire. 3rd...
  12. mrgto

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    Hey 4WDKC, Yes. I have already purchased and installed a new ECM harness. Back in 2013 I was looking for a 87-88 R30 flatbed Dually w/ the 350 tbi to be used as the base for a radically designed Art Project Vehicle. Which is is rig in my profile pic. I chose this model for the reliable and...
  13. mrgto

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    Thanks again! Posting the image of that clean Bulkhead really helped. Here's what I have: L wire - A1 The Black Wire paired with L goes to what looks to be C4 Disregard the 2nd Wire. 3rd Wire: 4B R wire, couldn't figure it out tonight There are a few wires on the Bulkhead that have the...
  14. mrgto

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    I did some radical custom modifications. Relocated the driver controls to an area "floating" above the hood. the ignition switch on/off on the column is the only thing I kept intact. Ignition Switch on and then use a temp on/off button to crank the motor. I kept the ignition switch operating...
  15. mrgto

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    Right on! Thank you . Yes the wires are labeled correctly and terminate at the left side of the bulkhead like you pictured. I don't believe the truck had AC or the Aux cooling fan. I did install a new ECM wire harness and got rid of the old worn out harness. There were some janky-ass...
  16. mrgto

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    I have an '88 R30 that has been stripped down and being used in a custom off road application. I'm in the process of cleaning up the engine bay and eliminating a bunch of electrical components that aren't needed. All of the headlights, Taillights, blower motor, AC etc basically everything...
  17. mrgto

    '87 350 TBI, advice needed for basic operation...

    .
  18. mrgto

    '87 350 TBI, advice needed for basic operation...

    Haha, thanks. Not too far down, considering I just need the engine to perform well at idle and up to 15mph ;-) I don't care about fuel economy or emission controls, however I would like a fast idle situation 1,000-1,100 rpms to keep those alternators happy. However, I would consider a custom...
  19. mrgto

    '87 350 TBI, advice needed for basic operation...

    Bingo!! Please, how do I go about doing this?
  20. mrgto

    '87 350 TBI, advice needed for basic operation...

    I've changed out the sensor, twice with thoughts maybe the newer one may be faulty. This didnt fix the issue.
  21. mrgto

    '87 350 TBI, advice needed for basic operation...

    Hey Guys, I've done quite a bit of research here, but this is a unique situation. Back in 2014 I picked up an '88 r30 w/ 350 tbi to use as the base for a mutant vehicle I was creating. I have since radically modified the rig, including relocating the driver controls. The vehicle never drives...

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