Well i spoke to soon...


rusty ol ranger

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Guess rusty 2.0 still isnt 100%. Im still getting the same issue as before (albeit, to a much lessee degree).

So today on the advice of my mechanic i went out and yanked the fuel rail/injectors.

He said on a batch fire system one injector could short out and starve the other 2 on that side? Sounds plausiable but i dont know.

Im going to replace the distributor or possibly just pick up coil, but havent decided which way yet. Im leaning toward distributor.

Heres my question though...

I replaced my coil plug a while back. I have 2 wires spliced into one green wire for the harness (the plug had two).

My question is is this screwing with tach signal somehow??
 


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fastpakr

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Since you started this as a new topic instead of continuing the previous one... what's the issue?
 

Dirtman

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So friggin big!
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Give me money.
But but but... 2.9's are the best!!!!

Sorry brother, had to do it.
 

rusty ol ranger

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Since you started this as a new topic instead of continuing the previous one... what's the issue?
Im still losing power after about 10-15 miles of driving 55-60 mph. The backfireing when downshifting is gone. But it still wants to stall at times when you get off the throttle and into the clutch.

Runs great cold.
I can beat it around town all day with no issue.

I get a code 41 (lean O2, new sensor and wireing is good, im suspecting an upper plenium gasket on this one), and code 18 that went away then came back.

Ive tested all the wires associated with the SPOUT system, which is what code 18 deals with. All seem to come back good.

The ECM has been changed to a 88 ECM to eliminate any knock sensor/EGR issues.

Athough i noticed on the final drive out to start ripping it apart it felt sluggish even cold.

It fires right up, has the normal 2.9 shakes at idle but smooths right out with throttle. Tested vaccuum, holds a steady 18-19lbs on hot idle. With no fluctation when revving (beyond the normal drop at first).

Totally lost again here amigos.
 

Paulos

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Code 18 tends to be an issue with the ignition module connector. I was surprised to find out that not all ignition modules have the same thickness on the six male spade connectors on the module. When you put a new module in an old connector, the old connector will sometimes fit loose on the module. I had this happen about a year ago. I replaced the connector also, and no more issue.

And I could be wrong, but I'll say it AGAIN... injectors. I had about a year and a half of similar issues with my '87. After replacing the complete fuel system (except for the injectors) and every sensor, etc, etc, what solved the problem was replacing the injectors.
 

fastpakr

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Re the injectors, you can use a mechanics stethoscope to probe each one and listen for it clicking.
 

rusty ol ranger

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I pulled the rail/injectors today. Hauled them up to my mechanics for a through check up. There gonna pop clean them and verify the electronics are working in them.
 

PetroleumJunkie412

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rusty ol ranger

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adsm08

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It is possible that a single injector can short internally and knock out the other two on the batch.

They are all wired in parallel, taking power and ground from the same point, but each has it's own dedicated connection to the bus. Since power follows the path of least resistance one injector shorted to ground would pull the power from all injectors on that power bus and let it all go to ground.

The only problem I see with that theory is that since the 2.9 pulls power for all 6 injectors from a single wire an internal short in one of them should kill all of them, and then the engine would stall.
 

rusty ol ranger

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It is possible that a single injector can short internally and knock out the other two on the batch.

They are all wired in parallel, taking power and ground from the same point, but each has it's own dedicated connection to the bus. Since power follows the path of least resistance one injector shorted to ground would pull the power from all injectors on that power bus and let it all go to ground.

The only problem I see with that theory is that since the 2.9 pulls power for all 6 injectors from a single wire an internal short in one of them should kill all of them, and then the engine would stall.
It should stall at that point. But shit i dont know. I will say im not as pissed as i prolly should be, this whole experence has kinda got me stepped out of my carburator comfort zone.
 

Paulos

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I had one that would randomly stick open. It only takes one bad injector to throw you into a rich, lean, rich, lean cycle, as the fluctuating signal from the O2 sensor will keep the ECM compensating from one extreme to the other. At least, that's the way I understand it.
 

Paulos

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Rust in the fuel rail?
When I installed new injectors back in January, I did the acid bath treatment on my fuel rail and a spare I have, then painted the one I used with high temp black. I wouldn't consider putting in new or rebuilt injectors without cleaning the fuel rail. It was a pain, but I felt it was a necessity.
 


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