Hey guys,I have never encountered an issue like this and I need some guidance. There is almost no information matching the issue I have.

92 f150 flairside 5.0 5spd 4wd. Has been my daily for the last year. It has always had a valve tap under load since the day I got the truck, which was expected, it has 240k on it.

I picked up a 99 explorer 5.0 with low miles, took it apart, checked bore and clearances,all checked out. I pull the old motor and install the new one. All is fine and dandy. Go to start the truck, pull spout, no start... Hmm I thought to my self, maybe I'm off on the timing. Set it to TDC, set dizzy, quadruple checked firing order, still no start. I wrap it up and our it outside.

The following day I go out to tow it into the shop and I crank it and it fires. Awesome I think,must of been a fluke. I pull it in under it's own power, pop the hood, hook up my timing light, pull the spout, boom it dies.

Every time the spout is pulled the truck dies or won't start. I've seen in the past the distributor being installed wrong and when it's pulled the timing goes so far tetarded it kills the motor, sadly not my case.

Spout is not shorted to ground, no codes, I don't know if it's any consolation, but my check engine light stopped working, but i don't know if it happened prior. My oil pressure "gauge" also does not work after the swap. Pulled in my tester tfi and grounded it, same issue, installed a different distributor, same issue,,hooked up a vsc gauge, in only running 15inHG. The truck has a miss when it runs, I don't think it's related to my current problem but I don't know what it could be. Almost everything is new, wires, cap, rotor, etc.

Sorry for the wall of text, but I don't know where to look next with this problem. Is it a symptom of the misfire??doubt it, but anything is possible I suppose.,thanks in advance..

 

Your initial timing wants to be 10 to 12 degrees before TDC if that figures into your equation at all.

 

With spout connected see what the timing is at, of course needs to be at operating temp. I think doing this will give a clue as to what is going on.

 

The timing can be whatever I want it to be with the spout in. I set it to 22ish, I can set it at 50 or set it at 10. It does move in response to the distributor turning, and hitting the gas will cause it to advance/retard. No matter what I put it at the second I pull the spout I have no spark.

 

Well if I'm remembering all this right, when you put the spout plug in, the computer takes over the timing and when you pull it out it doesn't go through that circuit.
So ... it would seem that the computer is capable of controlling the timing, which is a good thing.
When you pull the spout plug, do you have power at the coil ?
You'll have to check a wiring diagram maybe to see where that secondary 'spout out' current comes from - that may be the circuit giving the problem.
Just throwing extra thoughts out there, in case something clicks.

With the misfire - just for the sake of mentioning it - the 92 engine would be standard 302 firing order I believe. Is the 99 engine HO firing order ?
92 will still be speed density so the injectors would still work but the wires will be changed.
Again, just mentioning it just in case.

 

I have coil power with the spout pulled, but no spark. The firing order was changed to the HO order. I have continuity between pin 36 and spout connector

 

Icm ?

 

The one in the truck was fine prior, but for fun I tried my tester tfi. Same issue.

 

Strange... you used the 92 engine harness ?

 

http://www.revbase.com/BBBMOTOR/TSb

http://www.supermotors.net/registry/media/470468

http://www.supermotors.net/registry/media/470415

http://www.fullsizebronco.com/forum/...fi-bronco.html

http://www.revbase.com/BBBMotor/TSb/...adPdf?id=40361

I never had this problem before but I did some reading.....

How much did you use out of the Explorer? You should have used ONLY the long block. Everything else should be original to the '92: wiring, intake, sensors, distributor...ect..

Okay...So only thing you did when you made this swap was change the plug wire routing to the HO firing order.....Good....

Then You "do not mess with the injectors." Leave them plugged up how they were with the original motor.

Make sure fuel pressure is good. KOEO and KOER. Throw some Octane booster in just in case the timing is so far advanced it don't start..

IF it runs with spout in warm it up to operating temperature..Make sure base idle is set right. While running pull the IAC see if it idles okay..If it does good then move on.

Make sure TPS Voltage is good...IF those are set then move on...


-Your timing is off in my opinion....You need to find TDC on the #1 and restab the dizzy. You should be able to pull the spout while running and it should still stay running.

or

-You could have a Bad TFI module...Replace with Motorcraft only.

or

-You have bad wiring to the TFI module on the side of the fender.

or

-You have a bad computer... Which I don't think is the issue at this time.

This one here I don't recommend but some one on the mustang forum posted and it worked for them to keep it running while spout was out.
-Rev it a little...Pull spout while engine running.


Chris is right...You need to double check every thing...Make sure your getting 12 volts to the TFI module.

Make sure your plugs are gapped correctly.

Make sure your wires cap and rotor are in good shape and not arcing