Fuel Problems

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Apr 23, 2007 | 06:47 PM

#16

frankenbroncoII

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Joined: Jul 2003

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From: north carolina

hey, now this is a dramatic thought, but i think the 2.9 uses bank fireing injection, being it fires left bank, right bank on the injectors instead of individually, and if you have a sticking valve/stuck valve it could flood the cylinder out on the wrong stroke. but thought is kinda out there though.

May 1, 2007 | 07:00 PM

#17

Canadianice

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From: Vancouver, Canada

so I finally got around to going over my friends wiring in his 86 bronco II. Well needless to say I found a wire that comes of the coil that is green with a yellow stripe and it was broken. I followed the wire and it connected to a resistor so I looked over the wiring diagram and noticed this was the wire that traces back to the computer. we are in the process of repairing this wire could this have caused all this headache? also I cannot find the PIP connector that branches off the TFI connector. where is this located on the 86 2.9? because if I cant unplug that I have no Idea how to set base timing on this thing.

May 1, 2007 | 10:45 PM

#18

mrshorty

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Joined: Dec 2001

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From: UT

Do you mean the SPOUT connector? The SPOUT connector is usually hanging out of the wiring harness by the passenger side valve cover.

May 1, 2007 | 11:55 PM

#19

kernel-panic

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From: Yokosuka, Honshu, Japan

Yep, that's where the connector is, passenger's side, usually hanging out of the wiring harness loom between the lower intake and the valve cover or thereabouts. And YES... that wire being broken would contribute to the problem(s). Get that wire fixed, and you should be able to get 'er fired up and running soon. Hopefully, you don't have to ***** with the base timing much.

May 2, 2007 | 03:28 AM

#20

Canadianice

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From: Vancouver, Canada

Oh yeah, well my definition was still understood, sorry about that. His truck I swear doesn't have a spout connector like my 84, there its nothing around the area we are all thinking. There is no broken wire or wire in general. I took a look at his computer today and noticed that it is a re-manufactured one that some at one point put in. I'm wondering if this is a different system that was put in? Maybe the spout connector was relocated somewhere? I will keep you guys informed on my find and when we get the truck running, I have a feeling we are getting close.

May 2, 2007 | 10:39 AM

#21

kernel-panic

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From: Yokosuka, Honshu, Japan

Sounds like someone may have tucked the SPOUT connector away out of sight. If everything else is good, once you find the connector and check/set base timing, you should be closer to pay dirt. I hope that the "new" computer isn't part of the problem -- and I hope the previous owner didn't replace it thinking it was the problem before and didn't fix the true problem(s).

May 7, 2007 | 01:01 PM

#22

Canadianice

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From: Vancouver, Canada

well I still could not find the spout connector, but I believe I found something very similar which is a spout short. It has 2 wires going to it and I guess it causes a short and does the same thing as the connector on my 84. We went over all the wiring on his truck and checked all the voltages and they seem good. We reconnected the resistor by the coil and that changed nothing. There is one question however, the resistor I got off another 2.9 said P2 on it and the original one said P1 on it. They both look Identical. I read a post from a few years back about a Bronco that had the exact same problems as ours and it was the computer. The only difference is that he could not read any codes from his computer and we can. We keep getting the neutral drive switch code. Thing is the truck ran fine before and it threw this code.

May 7, 2007 | 06:22 PM

#23

kernel-panic

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From: Yokosuka, Honshu, Japan

What exact code are you getting? The only switch that does anything with "neutral" on a 5-speed is the clutch interlock switch which also is part of the starting circuit. The only thing I can think of is if someone has jumpered that switch in the past and that constant signal is making the computer do wierd things. Also, keeping in mind you said it was a rebuilt computer and not the original, I wonder if they put one in for an automatic transmission and not a 5-speed....

Could be a different resistor value, not sure. Only way to tell for sure is measure the values of each or get one specifically for an '86 and see if it has "P1" or "P2" on it and go from there.

You may have found the SPOUT connector, and it may not be marked, for whatever reason... never know who did what before you guys got a hold of the truck. Anyhow, hope you get it all figured out soon, and hope that something I've contributed has been helpful.