1989 V8 swap neep help PLEASE

[jeepfreek]

I have a 1989 Ranger that came with a 2.9 engine, I have installed a 1993 5.0 HO from a Thunderbird and I'm having a few problems .

(1) connector 116 has a red/ Lt blue wire that goes through the nss and is spliced off and runs to the tfi ignition module. On the 93 there is only red / Lt green.

(2) fuel pump is running all the time with key turned to the on position.

(3) fuel pressure at fuel rails but no fuel to injectors. I have 12 volts on the red wire but no pulse through eec.

Any help would be greatly appreciated.

 

[bobbywalter]

I have a 1989 Ranger that came with a 2.9 engine, I have installed a 1993 5.0 HO from a Thunderbird and I'm having a few problems .

(1) connector 116 has a red/ Lt blue wire that goes through the nss and is spliced off and runs to the tfi ignition module. On the 93 there is only red / Lt green.

(2) fuel pump is running all the time with key turned to the on position.

(3) fuel pressure at fuel rails but no fuel to injectors. I have 12 volts on the red wire but no pulse through eec.

Any help would be greatly appreciated.

sounds like you do not have a few things wired right. the tfi should have crank only and crank run power. thats provided your not using the remote style..

fuel pump running all the time means the pcm is grounding the relay....or your hooked up backwards.

sounds like the pcm is not on while cranking which is why your not seeing injector strobe. the relay for the pump should not see crank/run power, just the throw side of the eec relay.

so determine why the pump is running first. if it has key power directly, change that. make sure the eec relay is correct as well.

though if all is hooked up you can back door power to the eec via the noise capacitor with the pump running and see if you can fire it off that way...for a quick test.


take a few minutes to study the flow path of the fuel pump relay and eec relay along with the wac relay if your using that.

its easy to mess it up, the eec relay charges everything, and the pump relay should only be controlled by the pcm. that is the reason the eec feeds the switch side, so the pump can only run if the key is on.

 

[jeepfreek]

The tfi is the remote style ( mounted on fender wheel ) if that what you mean ? What is the difference?

Thank you for your help I will definitely go through the wiring some more.

 

[jeepfreek]

I traced all the wires for the eec relay and all seemed to be correct. I redid the fuel pump relay via the 1993 Thunderbird wiring and it still runs all the time with the key on , and if I have the key on and turn the distributor the coil starts to spark. Still does not start could the pmc be at fault?

 

[jeepfreek]

Fuel pump relay has black/ yellow wire that is hot all the time at the top of relay, I have Vpwr coming in the bottom going thru the coil grounding with tan/ Lt green ( pin 22 on eec ) to engrize the coil and pulling down the contact to provide pwr to the fuel pump.

Is the eec supposed to break the ground ( pin 22 ) and shut the pump of when primed?

 

[jeepfreek]

Pin #8 on the eec is called FPM it is reading 10 volts with the key on and not connected to anything else. Is that correct?

 

[bobbywalter]

well...its easy to mess up the colors



and i am not sure of your reference. what method your using to stand alone the 93 harness....and integrate it to the ranger system


i ASS-U-ME your using the ranger base wiring from its power distribution box....though this situation is almost mirrored across the product lines for the most part. it is why i rank the eec4 as easy to work with.

lets look at the fuel pump relay.

as far as the 1989 ranger is concerned, the YELLOW-BLACK STRIPE wire should come from fuse 1 which is a 25 or 30 amp....this is different from year to year sometimes...i have seen it switch from fuse 8 to fuse 1 and may be the source of confusion....worse...pre 89 it was fed as yellow only from a fusable link...aka keep alive power.... and its the load power side of the fuel pump relay...the side it gets connected to(what it supplies load power to) should have two wires....one goes to pin number 8 on the pcm as the fuel pump monitor....the other goes to the fuel pump through the inertia switch. they are usually orange with a light blue stripe....or light blue with an orange stripe on the way to the inertia switch and the pcm # 8. after the inertia switch it usually turns pink with a black stripe to the pump.

the low power switch side of the relay should have a red wire that the eec relay applies power to when you turn the key on. when the computer with pin 22 (or us at the test connector)grounds that wire...it connects power to the fuel pump.


so your computer is dead......your pin 22 wire is shorted.....or you have your shit hooked up backwards.


the eec relay.....(these are labeled in the pdb if your using that critter)......has the other keep alive power hooked to it...not sure if yours is slot 1 or slot 8....which is usually some iteration of yellow......whether straight yellow......yellow with black stripe......or black with yellow stripe on the load side of the relay....what it feeds is the red wire that ends up feeding most of the injectors and other high power sensors....and the low side of the fuel pump relay.....

its low side is turned on the the key on power....which is the red with green stripe wire.



its easy to get it mixed up if your not paying close attention.

 

[bobbywalter]

and to make it worse....the stang harnesses have a huge variance across the line from 86-93 in regards to the fuel pump relay situation.


i ASS-U-ME once again you have the style with the two "big" relays for the eec and the fuel pump by the maf connector.... there are other versions that use the green rectangle plug to communicate to the relay under the seat of the stang...

these are the differences that cause frustrations.

 

[jeepfreek]

Yes I'm using the 89 for pdb and the wire and relays you are talking about is what I have. I'm using a 93 thunderbird computer and engine harness.

What about the remote tfi and the red / it blue wire?

Thanks for your help.

 

[bobbywalter]

theres a myriad of schematics online for that system.



and it is not the same for wiring...the crank feature is not used in one style v the other.....

do you have a black module or a grey unit?


look up the wiring one to the other.

 

[jeepfreek]

I'm using the ford EVTM for both 89 Ranger and 93 Thunderbird , I also have the Mitchell on demand service manuals that I'm using . I had both eec and fuel pump wired correctly to what you had posted. The distributor sparking with key on ,only happens when I unplug the WOT relay.

The tfi module that I have is the black one, blk/white ign ground ,,gray/org pip, white/ pink idm, yel/ Lt gen spout, red/Lt grn run B+, and a tan/ yel tack.

 

[jeepfreek]

I'm using the ford EVTM for both 89 Ranger and 93 Thunderbird , I also have the Mitchell on demand service manuals that I'm using . I had both eec and fuel pump wired correctly to what you had posted. The distributor sparking with key on ,only happens when I unplug the WOT relay.

The tfi module that I have is the black one, blk/white ign ground ,,gray/org pip, white/ pink idm, yel/ Lt gen spout, red/Lt grn run B+, and a tan/ yel tack.

 

[bobbywalter]

I'm using the ford EVTM for both 89 Ranger and 93 Thunderbird , I also have the Mitchell on demand service manuals that I'm using . I had both eec and fuel pump wired correctly to what you had posted. The distributor sparking with key on ,only happens when I unplug the WOT relay.

The tfi module that I have is the black one, blk/white ign ground ,,gray/org pip, white/ pink idm, yel/ Lt gen spout, red/Lt grn run B+, and a tan/ yel tack.

so the pcm codes? your positve it is alive.....what pcm is it...??

so then it seems your pcm is fried. if the wiring is correct, and your pin 22 wire or eec code wire is not shorted to ground the pcm is failed open....or closed in this case

 

[jeepfreek]

I checked continuity between pin 8 and 22 on pcm, its grounded internally. I will have to look at the TFI wiring again. But the one I have is black and only has one connector on it.

 

[jeepfreek]

I have corrected the fuel pump problem, it was the PCM. I purchased a reman AL9 and installed it , the fuel pump circuit and injector circuits ( checked using a noid lamp on the injector harness ) are both working now. Still have a no start issue. Tested and replaced the tfi module ( remote black ) didn't help , I have fuel to the fuel rails but I need to check for correct pressure. ( just installed a walbro 155 lph pump 3 weeks ago) Also have spark at the coil and plugs but it looks weak (yellow in color). Removed plugs after trying to start and they appear dry.

Any suggestions or tips , thanks