1990 4.0 4x4
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From: Athol Id.
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
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
MIL = CEL
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
MIL = CEL
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