[Paul_NO]

Can someone tell me where the EEC-IV computer 60 pin connector is in the engine bay? The connector under the dash is right there, i see that 60 pin, but i understand there is one under the hood. I am trying to do some resistance readings on the EGR system and need to check between the 60 connector and the EGR solenoid plug.
I hope this makes sense!

 

[Flash]

Paul, I have a 91 bronco,5.0, eddie bauer,auto, that has a connector next to the air box. Hope that helps but I have been told not to plug into it with anything but the correct equipment or it may torch the wiring. Don't know that to be factual. Good luck.
Flash

 

[Paul_NO]

Thanks Flash, but 1986 was the last year for my model. Your 91 will be layed out like an 87. Thanks though. I have this sneeaking suspicion that it is on the firewall behind the intake manifold -- which puts it in a place wothout much hand room!

 

[bigbronco85]

1985?

I have an 85, does mine have a computer? There is a connector under the dash that is a mystery to me... If there is one, can it be read with a paperclip or something, like the GM type connectors?

Thanks,

 

[Paul_NO]

Yes and no...

Yes, that is the computer, and no, don't even think about sticking a paperclip or anything in it!

 

[bigbronco85]

How??

Ok that answers that question! I was always told that the truck had NO computer whatsoever, so they couldn't read codes. Then again, those same Ford dealers also said that my Lincoln had a Holley 4bbl, not EFI, which it does have, so they must be geniuses there
How do I read the computer, do I buy a code reading tool? What does it show info on? My "EMISSIONS" light has been glowing since 1989! My dad just ignored it, because he was told by a dealer to ignore it, hehe. Does this light mean change the 02 sensor or something?

Later,

 

[Paul_NO]

Reading codes...

Hey,
Your light has been on for that long? Yeah, its time to read those codes. Your '85 and my '86 are nearly identical, you have the EEC-IV computer system. The emissions light came on because some component part of the system malfunctioned. When I bought my truck, the EGR valve pipe was so clogged that it would usually kill when idling for more than 5 minutes or so. As for the code reader, I am about to buy one. I have not had any luck getting the codes to show using a multimeter.
I would suggest you get a copy of the Haynes manual for the Bronco, it has really good info on the whole emissions system in general, why some of the components fail and how to troubleshoot them. Read the sections 3 or 4 times, they seem confusing at first but start to make sense as you read them again. Also, get under the hood and actually look at what is being described in the book - it makes things so much clearer.

Let me know how it goes, and if I find something really interesting, I'll be sure to post it.

Later,

Paul_NO