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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 11-13-2015
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I am: James R. Senn
Join Date: Apr 2011
Location: Athol Id.
Vehicle: 1990 Ford Ranger
Posts: 12
Total Props: 0
1990 4.0 4x4

Lots of miles and runs well. However when it reaches operating temps the idle is very rough to the point that I shift to neutral at lights/stop signs. Tell me what to replace Thanks Old Jim
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Old 11-13-2015
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I am: Ron Dean
Join Date: Jan 2014
Location: Vancouver, BC
Vehicle: 1994 Ford Ranger
Drive Type: 4x4
Engine: 4.0
Posts: 4,764
Total Props: 88
Probably nothing needs to be replaced.

I would clean the MAF sensor and IAC Valve, either can cause poor engine running after warm up.

Is there a CEL(check engine light) when you first turn on the key?
There should be, and it should go off after a few seconds or when engine starts.
If no CEL then bulb could be bad or system is bad.

If no CEL at all then I would check if there are any trouble codes
You can check the codes yourself have a read here: Ford Ranger - Testing EEC-IV Equipped Engines

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