Bronco II won't start

sv650andy · Oct 10, 2010

I am a noob not only to the forum but to the Bronco II in general. So far from what I have seen this a great forum. I was given my Bronco II by my father in-law. At the time it needed brakes, and the power windows didn't work. Well I fixed the brakes and then moved on to the windows. In the process of trying to find the power window relay ( which I still haven't found) I mistakenly disconnected all of the three relays under the power distrubition block on the passenger side fender well. Well now the Bronco won't start. I don't here the fuel pump come on before trying to start. I checked the inertia switch and it is working properly, but I am getting no power to the lead. I can hear clicking from the relays when I turn on the switch. I am new to the Bronco and EFI, and I just can't figure this out. PLEASE HELP!!!!

kimcrwbr1 · Oct 10, 2010

Did you put the relays back in the same connectors you took them out of. If it was running before you pulled the relays it has to be there.

84bluebronco2 · Oct 10, 2010

Well let me start by saying welcome to TRS! If you put the relays in the power box back directly where they were removed from, check to make sure they are inserted properly and that one didn't short out. Not many people (outside of us who are insane enough to own RBVs :icon_hornsup:

) think to check the inertia switch so kudos. I had the 2.8 carb and moved up to a 4.0 EFI so not positive on the orientation of the relays but make sure if possible, they were not inverted. I try to help the best I can but Kim is one of the best sources for info on any 2.8 imo, and adsm08 is also a RBV genius. Keep checking in and searching the forums. All of us are here to help each other out. Good luck!!

country0001 · Oct 11, 2010

Never hurts to check your grounds either. Esp the one from the engine to the frame

Earl43P · Oct 11, 2010

http://www.therangerstation.com/tech_library/EDiagrams/files/Diagrams_ElectronciEngControls2_9_1of3.JPG

from the Tech Library.

The green relay is for the Fuel pump, the brown is for the PCM. Make sure they aren't swapped.

sv650andy · Oct 11, 2010

I did put them back in their original positions. I am thinking I may have shorted one out, but I can't say for sure. There is also a white relay under there as well but I believe that is for A/C. I guess I will start changing relays and see if that fixes the problem. Anyone have any clue where the grounds are for those relays so I can check those as well? Thanks for the diagram Earl43P that will help alot. Thanks for the info everyone!

sv650andy · Oct 11, 2010

just wanted to say thanks to all of you. I changed out the relays this evening and she fired right up! Now I have to figure out where this bad knock in the motor has came from all of a sudden.......

adsm08 · Oct 11, 2010

Might be lifter tap. That's pretty common on 2.9L engines.

sv650andy · Oct 11, 2010

Well I thought about that, but this is way louder than any lifter tap I have ever heard, but my only experience is with SBC and BBC engines. It seems to be louder on the bottom end than the top. Any clue what I might can do to try and figure out where it is coming from? Will some Marvel Mystery Oil or something along that line help it any?

kimcrwbr1 · Oct 11, 2010

Hows the oil pressure and how old is the oil. If it is a knock there is no magical fix normally a fatal symptom. You can check the timing chain pull the cap off the dizzy and turn the crank back and fourth and see how far it turns before moving the rotor possibly the chain slappng the cover hopefully. If it turns out being a connecting rod the 4.0 swap would be a good option but I prefer bone yard engines and look for the engine/wiring fire ones no front end crashes the engine usually dosent over rev they usually just stop or shut down fast. Put a gasket set and oil pump in while it is apart. Let us know what you find out.

sv650andy · Oct 11, 2010

I am going to have to hook up an oil pressure gauge to check the pressure. The one on the dash is not working at all. At least I hope its not working. I thought about the timing chain. I had one do that to me in a SBC before so I may check that as well. The timing of this showing up is just odd afte working on all this other stuff. Before I started messing with it over the weekend it was fine, but I don't see how messing with electrical issues could cause a knock like this. At this point if it turns out to be a fatal sympton like a rod knock. I will definitely pull out the engine, but if I do that it's getting a V8 for sure!

Bronco II won't start

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