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  #1  
Old 01-07-2016, 02:03 PM
mustangdave1969 mustangdave1969 is offline
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Default 94 4.0 idle issue

I've been having a strange issue lately with my 94 Ranger 4.0. At startup it acts like it has a miss & the check engine light is on. After driving a mile or so the idle issue goes back to normal but the light stays on. Under load at around 1500 RPM it acts like it loses power but then straightens right out. If the outside temp is really cold (the last few mornings have been in the teens) no check engine light & the idle is fine. I've replaced MAF, plugs, wires & coil pack, O2 sensors. I was thinking maybe Catalytic converter but not sure. Any ideas?
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Old 01-07-2016, 03:30 PM
Futurefd Futurefd is offline
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Default Re: 94 4.0 idle issue

Pull the code. Don't just throw parts at it.....
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Old 01-07-2016, 06:50 PM
cowboybilly9mile cowboybilly9mile is offline
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Default Re: 94 4.0 idle issue

Quote:
Originally Posted by mustangdave1969 View Post
.................. Any ideas?
Pull and post the code(s) and make sure to note if it's a KOEO, KOER or a CM code as this may make a difference, Stop buying parts until you know what you need to buy to fix it (ie, guessing is a game, not reality). You do not need a code reader to scan all three code categories, good news.
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