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Hello! I’m continuing to work on my project truck (putting an 89 351w into a 94f150 that had an in line 6) and have a harness question. I was able to purchase a harness from a gentleman via this forum that had come off a 95 351w I was told. I started to install and noticed there are no plugs on the passenger side for the TPS or the idle air control valve. There are currently two plugs on the passenger side (one for ECT and other I assume for egr). Am I looking at this wrong?? Are those plugs for the TPS and IAC supposed to come off the passenger side of the harness? I’m also noticing there is no plug for the ignition coil on the drivers side. Any thoughts would be greatly appreciated. Found a different harness from a 93 351w but wanted to check before I go buy another one
thanks
The only two plugs on passenger side, one is for ECT
Drivers side front of the motor Drivers side middle motor
Here is a pic of the 5.8 I had in my '90. I believe the connectors in your first pic above are for the IAC and EGR(could be the TPS too)
Looks like something was cut off the harness in that second pic, and looks like you may be missing a sub harness or two.
3rd pic are the connectors for the smog solenoids and the coil that are all mounted on the same bracket that stands over the drivers side valve cover, you can see this in my pic below.
First pic, wires (LG/R)-ECT, (GY/R)-Signal Return, Engine Coolant Temperature(ECT), goes to sensor on the bypass or crossover tube(or whatchamacallit).
The other more rectangle plug will be your Idle Air Control(IAC), should have a (W/LB) wire, All white with small light blue wire.
Second picture, should have IAT, Temperature sender, Oil pressure sender, Distributor plug, and cut wires may be A/C?
Third pic, TAD grey plug, TAB black plug, Flat wide plug is coil, other flat plug will be EVR. Looks like your missing the condenser wire/single grey plug.
It might actually be easier to pull the harness off, take a complete picture of the whole thing, may be easier to identify what is missing.
First pic, looks like something is plugged in at bottom of picture, what is that?
In the bottom pic I have a piece of green tape over the thermostat intake. I’m that pic the smaller rectangular plug doesn’t fit into the IAC, and the locking tab for that sensor is on the flat side, not the front…….
I will see if I can pull it off and a take a pic. Still not seeing TPS plug. Wonder if it got snipped and buried. The guy I bought it from said it was from a 95 bronco 351 and he thought the snipped wires were from power steering switch…….💁
EDIT: my bad wwhite. the plug on the bottom of pic 1 along the valve cover is actually attached to that small black plug you see in the pic. just cant see the wire follow it around.
Last edited by Muskyhunter715; Apr 6, 2022 at 09:04 AM.
Reason: error
I made the following, it will be close with the labeling, might even be 50% wrong, but at least it identifies all connections, maybe missing one.
I'll get pictures of my own truck to verify. If you can do the same with your harness, we should be able to figure this out:
1995, taken off ebay, labeled by me, might be wrong.
Your harness may have come off a 1995 Bronco, that does not mean that is what the harness was originally for.
Where is your TFI plug? I do not see it at all.
If your harness is from a Mustang, the round plug with the 5 or so wires maybe for distributor mounted TFI.
I’m almost positive my trucks TFI is on the drivers firewall. My harness is missing a ton of stuff. The flat coil wire on drivers side is much smaller, No condensor. It’s almost like someone cut that bundle of wires off on the passenger end. The only plugs I have are the two in the pic…. And one of those is the ECT plug
yes that looks more like the plug i see on my harness (for the EVR, not the coil). i am actually planning to bypass those plugs as i removed EGR, smog and AC and saw online you can bypass those plugs with a 1/4 watt 75ohm resistor. not sure if that will work, but that's what i was gonna try. I am gonna pull the harness off tonight/tomorrow am and post a full pic of the entire thing so you can see what i have. appreciate everyones time and input.
The guy I bought it from said it was from a 95 bronco 351 and he thought the snipped wires were from power steering switch…….💁
To be fair, I said that I wasn't sure what the snipped wires were for, but my best guess was power steering pressure switch...
When I laid this harness on top of the 5.8L harness in my Grandfathers '95 F250 his harness didn't have a connector there and it was in the region of the power steering pump, so that's how I came to that conclusion. But I had no way to be sure... that's why I agreed to the reduced price when you asked.
As I said in our private messages, this wiring harness came on the 5.8L that I swapped into my '91 F150. The guy I bought the engine from claimed it was from a '95 Bronco, and it is a roller cam engine and has the wiring harness with the later style square plug, so I didn't have any reason to doubt him... but I bought it out of a storage shed (i.e. I never saw it in the vehicle) so I can't say for sure.
I'm sorry you're having issues with this. It was never my intention to sell you a bad product. If you're unhappy you can send it back to me and I'll refund your money.
Ok, that helps.
On the passenger side of harness, I'll try without pictures.
You need EGR, TPS and Canister purge.
Your Canister purge pigtale is plugged into the TPS.
Unplug that, that is where your TPS goes. Should be three wire.
The round plug that is different than the rest, fine male pins, can have 8, but about 5 wires, from your original second picture close to your hand is to the distributor.
On mine with A/C, drivers side there is an A/C pressure and A/C clutch connectors, two.
Those cut wires from your original second picture may be the coil and condenser connection, look for a second red wire there.
Probably cut the coil out for what ever reason. If it is, there'll be two red wires.
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