won't turn over after maf conversion

Topic: won't turn over after maf conversion (Read 3583 times) previous topic - next topic

Re: won't turn over after maf conversion

Reply #15 – May 09, 2005, 01:19:02 PM

Little update for ya....... Bridged the 2 posts on the starter solenoid and the motor turned over. :D A little bit of light at the end of the tunnel.

Re: won't turn over after maf conversion

Reply #16 – May 09, 2005, 02:38:15 PM

sounds like you gots to replace the wires to the starter then. Good luck!

Re: won't turn over after maf conversion

Reply #17 – May 09, 2005, 03:22:23 PM

If the starter turns over when the solenoid is bridged there's nothing wrong with the starter's wiring. The wiring to the solenoid is a different matter.

Try bridging the large post closest to the battery to the small post (the one that points toward the engine compartment). If the solenoid clicks and the engine turns over the solenoid is fine as well.

This is not the problem, though, since you don't have any power at the ignition switch (based on your tests noted above). Your problem is with the two large yellow and single large black/orange stripe wires going to the ignition switch. Somewhere between the switch and the starter solenoid those wires are disconnected. Be it a bad fusible link, an unplugged connector, a loose bulkhead connector or whatever, you will not get your car working until you get power to that ignition switch.

Re: won't turn over after maf conversion

Reply #18 – May 09, 2005, 05:48:21 PM

Sounds like when you swapped the pins in your wiring harness for the eec you placed them in the wrong positions.
If the car ran before and not now then that is definetly what you did wrong or you have a dead eec.
Print out the wire swap diagram and be sure to place it the write way up when looking at which pins are which.
The trigger wire on the top of the solenoid(red with blue stripe i believe) is not sending power to turn on the solenoid,this is due to the fact i have stated above.
If one wire (say an eec power wire was placed in the wrong position then your car will not turn over and you may have roasted your eec.

Re: won't turn over after maf conversion

Reply #19 – May 09, 2005, 06:25:37 PM

"If one wire (say an eec power wire was placed in the wrong position then your car will not turn over and you may have roasted your eec"

Well that sucks.

"Try bridging the large post closest to the battery to the small post (the one that points toward the engine compartment). If the solenoid clicks and the engine turns over the solenoid is fine as well."

I did that and nothing happened. But when i did it with the post furthest away from the battery, the solenoid clicked but didn't turn the starter.

If i bridge the two post together and turn it over will the engine fire up? I have the upper intake off right now so when i put it on i would atleast like to hear it run for some motivation.

Re: won't turn over after maf conversion

Reply #20 – May 09, 2005, 07:06:50 PM

Well i just quadruple checked the harness and eec pin locations and they look good to me. One thing I did notice was that there was no pin in location 23 and in doing my research i have found that the computer ground wire is supposed to be in 23. Is that just for mustangs or does that apply to all harnesses? Also, when i was repinning, there was a pin in location 50 and there isn't supposed to be. One of the maf signal wires need to go there so i took it out. I believe that it was for the cruise control. Think that might be related to my problem?

Re: won't turn over after maf conversion

Reply #21 – May 09, 2005, 08:22:28 PM

You can completely remove the EEC from your car or repin it any way you like and the car will still turn over. It won't start, and you might destroy the EEC, but it will turn over. The circuit from the ign switch to the starter solenoid is a direct one, stopping only at the neutral safety switch on its way. The EEC has nothing to do with turning the engine over.

That being said, one might think it could be the park-neutral switch, but this would only explain the not turning over part. It would not explain the "no radio" part, nor would it explain the no power at the ignition switch part. The no power at the ignition switch is key - until you get power there the car will not run. You can turn it over by jumping the solenoid, as you have found, but this will do nothing but turn the engine over - it will never start because the fuel pump, distributor, coil, injectors and everything else required to run the car will not be "live". Neither will your signal lights, radio, heater, or any other ignition-switched circuit be live.

You have GOT to get power to those two yellow and one black/orange wires at the ignition switch. Even if you have to run new wires straight from the battery, through the firewall, and to the switch (NOTE: If you do this, make sure you use wire no smaller than 10-gauge. These wires carry a lot of current, and smaller wire WILL burn.). You are wasting your time with any other diagnostic step until you have power there. Without that power about 80% of your car's electrical "nervous system", including 100% of what is required to make it run, is missing. The ignition switch cannot feed those circuits unless it has power to feed them, and it gets its power to feed them from those three wires.

Re: won't turn over after maf conversion

Reply #22 – May 09, 2005, 08:27:02 PM

What Thunder Chicken just said is 100% correct...

You need to keep looking for a wiring problem.

Re: won't turn over after maf conversion

Reply #23 – May 09, 2005, 08:46:47 PM

Well i don't know guys but in my personal exp,i removed the eec from my car once when it was a 2.3l and it wouldn't turn over,all i had was lights,signals door ding(not sure about stereo as mine is rewired) etc but nothing eng related.
Also if the car ran fine before this and all he did was repin the harrness for the maf then there in lies his problem.
Now it could be that it was pinned wrong and then caused a short else where but if it ran before then he has to start with what was wired wrong at the eec.

Re: won't turn over after maf conversion

Reply #24 – May 09, 2005, 08:59:26 PM

Here's the wiring diagram for the starting system in these cars:

You'll note that the EEC-IV does not even come into play. You'll also note that those two all-important yellow wires go into the ignition switch. No power at those two wires = no start. This is not a complete diagram of that ignition switch, either - all of the other positions of that switch (RUN, ACC, START, OFF) have their own circuits, and ALL of those circuits are fed by the yellow wires noted above and the black/orange stripe wire not shown. There is no clearer way to say it: Until you have power at those wires you are wasting your time diagnosing anything else.

Re: won't turn over after maf conversion

Reply #25 – May 09, 2005, 10:08:18 PM

To settle this one, I just went out and pulled the EEC out of the blue 5.0 Bird.... AND
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It cranks just fine....

Re: won't turn over after maf conversion

Reply #26 – May 10, 2005, 12:22:37 AM

I guees I'm gonna run those three wires in the morning. I'll let you know how it goes. Thank you guys very much for the valuble information. without it i would be lost.

Re: won't turn over after maf conversion

Reply #27 – May 10, 2005, 04:37:49 PM

Hooked up the two yellow wires to the post on the starter solenoid that is attatched to the positive side of the battery. Turn the key and the key related functions turn on and the starter solenoid clicked but the motor didn't turn over. I could notfind a black and orange striped wire either. Oh yeah my autometer tach went backwards when the key was turned to run.

Re: won't turn over after maf conversion

Reply #28 – May 10, 2005, 08:06:23 PM

I was g with it more today and i got it turn over! :D Yaaaaaaaayyyyyyy! BUt there wasn't enough juice in the battery to start it. Its probably 180 out of time too. I'll mess with it more tomorrow and I'll let you know how it turns out.

Re: won't turn over after maf conversion

Reply #29 – May 11, 2005, 08:01:52 PM

Well now all of you guys can finally sleep at night :rolleyes: ......I fixed it!!!!!!!!!!!!!!!!!!!! woooooooooooooooowhooooooooooo!!!!!!!!!!!!
I thank everybody who helped very much. Definetly would not have the first idea on what to do. And boy I must say it sure does sound a helluva lot better with the new ho cam instead of that shiznitty so cam. The car seems to have taken well to the cam install and maf conversion. Very glad about that. It idles great at around 8-900 rpms. Anybody know what its supposed to idle at?Taking it for a test spin to see if the cam makes any more power tomorrow.