Having problems with your 1994 Ford Ranger Supercab ?

4.0L ford ranger runs rough misses under load, idles fine and under full throtle it runs with good power but when you try and go at a constant speed power dies off.. also on left side of engine all 3 plugs were lean and clean and the right side all 3 cylinders were black and rich??? i have replaced o2 censors and throttle position censor. is there a comon fix?

Posted / edited by AnonymousUser on : 17-06-2019

Answers :

On the lean area look for a vacuum leak anything there,like PCV hoses and pull the plug on the EGR is there a difference?Is the valve hot at idle? Now check the rich side pull the hose off the fuel pressure regulator is gas leaking out? MAF cant do this, IAC cant do this ,TPS, If everything checks out no vauum no EGR leak No fuel regulator leak you may have to find out if the 02 sensor is reading the correct bank .Bank one could be on bank two, and bank two can be one bank one,It could be mismatched
Repair Help & Product Troubleshooting for 1994 Ford Ranger Supercab

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