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New issue! 


Strieg

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Ok so now truck is surging in lower rpms (under 2000) and above feels like a slight miss.
But at it's idling really high! Around 1300!
 


Strieg

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Please help I gotta get smogged this month and idk if it'll pass ....
 

BillupsOMally

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I didn't read all the way through your previous thread, but did you try disconnecting the spout connector to bypass the TFI? I've had three (original and 2 junkyard ones) all fail in completely unique and random ways. It couldn't hurt. If you already tried that forgive the redundancy.
 

Strieg

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No I haven't, I'll have to read throughly through my manual to figure out how to do that... I was actually wondering if the tfi was bad...
 

BillupsOMally

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I don't remember exactly where it is, but I think it was in the passenger inner fender area (maybe?). It's just a little two wire harness with a plug that looks like it's meant to cap it off/dead-end it. I'd just go find it and tell you where it is but my 2.9 harness is in a box on a shelf. lol

There's a really good check-sheet in the tech library somewhere for diagnosing that ignition system.
 

Irokranger93

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http://www.therangerstation.com/tech_library/TFI_Diagnostic.html
http://www.therangerstation.com/tech_library/remote_tfi.htm
http://www.epinions.com/auto-review-2771-1DEC7FB7-39E554B7-prod4

The following vehicles have distributor-mounted TFI modules
1984-89 Ranger (2.3L)
1986-91 Ranger/Bronco II (2.9L)

If you have a fender-mounted TFI module on a heatsink, then it won't get baked dead, but it can "wear out" and you might get some flakiness in ignition. Essentially, the only real sympton is weak or inconsistant spark, as the TFI module drives the coil as well as provide timing feedback to the EEC from the distributor's "wheel of tabs

O2 sensor would be the next thing I'd look at
 
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RyanL

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Ok so now truck is surging in lower rpms (under 2000) and above feels like a slight miss.
But at it's idling really high! Around 1300!
I had my idle air solenoid (idle air control actuator/motor or whatever you want to call it) go bad on me and it did the exact same thing. Cleaning it didn't help much either. Personally I would've just continued the other thread since it sounds like you didn't entirely resolve all of your issues.
 
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