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OT: 3.0 V6 sick
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Posted by CWL on July 26, 2007 at 05:16:01 from (64.66.89.57):
Well gang I'm about out of ideas on this one. I've got a 2000 Ranger with a 3.0 V6 that is running badly. It idles rough and has lost what little power it had on the road. Fuel mileage has dropped down to around 10mpg. Took it to a mechanic acquaintence and he put a scanner on it. Showed a missfire condition on cyl. 4 & 6. So I replaced the spark plugs, plug wires, fuel filter and later the coil pack. None of that helped. Took it back to him again to read the codes. The only thing it showed was a misfire condition (but this time it would not specify the cylinders) and that the differential pressure sensor was out of limits. This is the sensor that controls the EGR valve. So I replaced that. No improvement. This truck has an O2 sensor after the catylitic converter. He told me that if the converter was starting to go it would show up on that O2 sensor. Will it? Next I got to thinking about the injectors. Found a place in Washington that will test, clean and refurbish injectors for $17ea. My injectors new cost $80ea. So I pulled all of them and sent them off. Testing showed that they were not that bad and cleaning made them better. I put it all back together last night and no improvement. While I had it apart I looked at the EGR valve and it looked clean. I didn't find any vacuum lines broken or off. I have sprayed around the engine with brake cleaner to try and find a vacuum leak. The vacuum only tests at 12 inches at an idle and is very shakey. It does come up some if I raise the engine rpm. I think that the vacuum is that low because of the rough idle, but I'm not positive. I think I will take a compression test on it tonight. Any ideas???
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