Ωhm

Plug vacuum line to EGR. This disable EGR valve. Connect fuel tank fumes to charcoal canister. Vacuum canister is needed for HVAC doors during WOT conditions. MAP hooked up to vacuum?

Vehicle harness pinned out good for A,B&C. One more check is needed at the component side. Pin A to B for continuity (O2 heater). 88electrical manual shows 6Ω's. If this shows good, suspect O2 sensor, the component. O2 voltage needs to swing rapidly between Rich and Lean, as stated above. If new O2 doesn't solve your problem, we need to go back to REM and FT values.

You got people drooling with those pictures. Welcome.

MS XP powerpoint is saved two (2) ways. 1. Saved as .ppt allows you to edit and save the file. 2. Saved as .pps automatically launches the slide show. Which one do you have? I think you'll need .ppt in order to do anything with the file.

Using REM, find your Fuel Trim values. This will determine if you're running Rich or Lean.

If you're going to use three (3) relays, might as well put relay x to work. Schematic needs proofing. Mark-up at will. Possible weak link: Headlight ground circuits. Factory never intended both Low and High beams to be on at once. Relay Logic: This (LB) or (This (LB) and That (HB)).

47 years ago for me, Feb 19th, funny how certain dates are chiseled in stone. Not sure on the new weaponry used today, but I'll bet they still holler at you.

Renix yes. Bring your baby home with a trailer. Vehicle may have other problems. Welcome to the CC forum.

Photo taken from thread "How To Make All 4 Headlights Illuminate With Wagoneer Header" Not sure relay X serves any purpose here. Relay H carries current for both the High and Low beams. Yes schematic works.

YEAR?? ENGINE?? Add this to your signature. https://comancheclub.com/settings/signature/

BUMP Cleaned up request (post 1). Cleaned up chart explanation.

RENIX 21

Two hour story with a good ending.

Does the O2 heater work?

Not sure here either, but did the vehicle ever have dual batteries?

I don't see no TPS cannonball.

During engine crank only the ignition switch will ground certain bulbs, gauges or both. This function is called "bulb check". Could be normal for what you are seeing happen to your gauges.

Also, make sure your IGN Module is powered up (I1 feed) and module is grounded. C213_A (I1):C213_B (GND). From 88 electrical manual.

You didn't add it again. Your 1987 electrical manual has new information in it. NOTE: 4.0L engine control has no ballast, no O2 sensor WOT bypass, plus diesel stuff. Should be saved somewhere for easy access.

Aren't some photos from websites just links to other websites?

Special Tool:

If you can just pull pin C213_C (green w/tr), three pin connector at IGN Module, vehicle will START.

Does water temp and fuel gauge peg with Key On only (not cranking)? Try disconnecting the IGN Module to see if Tach is pulling the circuit low.

Are the vacuum lines at the EGR solenoid connected correctly? YR? ENG?

Prior to putting your vehicle on the dyno, they must set the inertia weights for your vehicle. If this weight is set too high, you'll never slow down in time. Each vehicle is different. Tire grip comes into play here and make sure rear brakes are adjusted properly.