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  #1  
Old 04-04-2011, 09:10 AM
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duncanstives duncanstives is offline
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Theres a huge, terrifying snake on my engine!

Oh wait... It the wiring harrness...

So yeah... Like I said: A huge terrifying snake.

As you might imagine I am not looking forward to ohming out every pin of a 72 or so pin wiring harrness for my EFI 351... Surely there is an easier way? Like a wiring diagram?
Hopefully a way that DOESN'T involve paying painless a boatload of money for a harrness set up....

Also... Question number 2: The engine came with a set of shorty headers that DON'T feature the huge quanity of, presumably, emission related tubing sticking off like some lab expirment gone wrong like the stock ones do... I like this so I would like to switch to them (Mostly because some of that tubing is in dubious shape on the stock ones). Problem is I am guessing this will make the all seeing computer grumpy and I would like to avoid this... Any idea what this tubing is and how I might decieve the computer with regards to its absence?
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  #2  
Old 04-04-2011, 10:10 AM
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Lots of info here it has been a while since I read it, but I do seem to remember there being wiring diagrams or links to the same.

http://www.pirate4x4.com/forum/showt...highlight=totw
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  #3  
Old 04-04-2011, 10:34 AM
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Thanks... I have started reading that once or twice. My harrness seems a bit different though than what they are showing there as well as well as other places I have seen ... It has a huge round connector with male pins inside it that I assume went to the firewall of the truck it came out of. From there I assume we have ignition, (start, run, acc, etc), check engine light, fuel pump (maybe... The wires are all small gauge so maybe not), ac switch and who knows what else.
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Resting in peace... Um... In piece... Er... IN PIECES

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  #4  
Old 04-04-2011, 04:40 PM
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On SBF Fords of that vintage, the air injection tubes went into the back of the cylinder heads. If not, then into the exhaust manifolds. I don't know if the ECM checks for functioning of the air system. I know it looks for correct EGR operation. There is a group of vacuum switches by the ignition coil that control the air system. Hopefully you will just be removing the air pump and its associated hoses.
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Old 04-04-2011, 05:52 PM
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Your using a truck harness? It would be like ford to use something completely different in the trucks. I love Fords been running them all my life but sometimes there engineers mae me want to pull my hair out
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congrats...that's the first post on here I have absolutely no effing clue how to comment on.


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  #6  
Old 04-04-2011, 06:29 PM
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Thumbs down

Quote:
Originally Posted by csuengr
On SBF Fords of that vintage, the air injection tubes went into the back of the cylinder heads. If not, then into the exhaust manifolds. I don't know if the ECM checks for functioning of the air system. I know it looks for correct EGR operation. There is a group of vacuum switches by the ignition coil that control the air system. Hopefully you will just be removing the air pump and its associated hoses.

So I can do away with the lab experiment headers without issue... This is good news. I assume there is some little block off plates I put over the spot where this stuff attached to the heads? Also since most engines I have seen dont have them I guess they are not extremely important to performance or longevity of the engine?

Also if the egr valve is what I am thinking (little set of tiny multicolored vacuum hoses?) I will be trying to do whatever is easiest: Fix that system (dispite their festive appearance the multicolored plastic vacuum hoses don't seem to be the best choice... They have become brittle and snapped), or bypass that system.

Finally: the other after market headers (drivers I think?) has a 5th passage... Looks like it should go to a cylinder but it ends in a threaded fitting... I presume I did not get a set of headers designed for the elusive 9 cylinder engine so now I am left wondering what it's for.
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86 Pathfinder Conversions "K-Van"

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Volkswagen rail buggy

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Current status: DDing
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  #7  
Old 04-04-2011, 06:35 PM
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duncanstives duncanstives is offline
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Quote:
Originally Posted by bigun
Your using a truck harness? It would be like ford to use something completely different in the trucks. I love Fords been running them all my life but sometimes there engineers mae me want to pull my hair out

Yes... The engine and harness came from a truck. I will get a picture of the connector tomorrow if it has quit raining/hailing/having tornados. Until then: it's round and about 4in in diameter with LOTS of fairly light gauge wires going to it.... The connector for the ecu (and ecu itself) looks just like described elsewhere.
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88 Waggy
Resting in peace... Um... In piece... Er... IN PIECES

Current Status: Under construction. Phase 2.

86 Pathfinder Conversions "K-Van"

Current Status: Broke

Volkswagen rail buggy

Current status: Broke

95 Jeep ZJ V8

Current status: DDing
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  #8  
Old 04-05-2011, 08:04 AM
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The EGR valve is the thing on the passenger side of the intake after the throttle body. Should have a white top with an electrical connector and a tube that runs down to the lower intake. The connector is for the position sensor. The valve itself is controlled by one of the vacuum switches by the ignition coil.
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  #9  
Old 04-05-2011, 08:06 AM
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Forgot, the extra threaded hole is still a mystery to me. I suspect that at some point Ford ran air injection into the manifolds. I have never seen this unless it was on the carbed versions of the engines. Just plug the holes.
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  #10  
Old 04-05-2011, 08:29 AM
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duncanstives duncanstives is offline
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Thanks... I will try to find a plug of some sort.

With regards the wiring: The big round connector is sometimes refered to as a "showerhead" connector... Still no luck finding a pin out though
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88 Waggy
Resting in peace... Um... In piece... Er... IN PIECES

Current Status: Under construction. Phase 2.

86 Pathfinder Conversions "K-Van"

Current Status: Broke

Volkswagen rail buggy

Current status: Broke

95 Jeep ZJ V8

Current status: DDing
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