General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

Rough Idle with warm engine only.

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Old Oct 20, 2017
  #1  
Amp94.0's Avatar
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From: bfe, nc
Rough Idle with warm engine only.

I have a 1994 Auto. 4.0 with 270K miles. Around 10 years ago I noticed if I would drive somewhere between 25+ miles and would recrank my truck within a 30-45 Min time frame I would have very rough idle. After about a minute the engine/RPMs will gradually increase and all is fine and drives well. Now, what happens is I have the rough idle and my truck dies almost instantly until I recrank and give it a little gas and it eventually will even out and drive fine. I have replaced the oxygen sensors and cleaned the IAC, MAF, Throttle, intake, Air filter within the past 2 months. I replaced the fuel filter several years ago and it still did this after I replaced it. Anyone have any ideas what my issue may be? No check engine or codes as of yet. Thanks!
 
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Old Oct 21, 2017
  #2  
Grumpa's Avatar
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Joined: Oct 2017
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From: Indiana
That to me sounds like a temperature related issue. AIT sensor, or the coolant temperature sensor that feeds the PCM, not the gauge. You have a 94 so I'm not positive you have these, but that's what I'd look at next.
 
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