My 3.0 is DOP. Help. - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 09-11-2009
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My 3.0 is DOP. Help.

My DD is a 95 Mazda B3000 but it is really just a ford ranger with mazda sheet metal. the problem is that it is way down on power. it has a 3.0 v6 that is rated at 145hp but it feels like it running at about 50hp for the last month. in 1st i can floor it and it takes about 3 full seconds to get to 3000rpm. the revs just build slow in every gear. it probably takes about 30 seconds to get to 70mhp. the thing i cant figure out is it idles great and start the first time everytime. The only thing i noticed is when the engine is cold and i start it the idle is very low for about 10 seconds then it comes up and is fine after that. Could my cat be clogged? I have just never seen a car run so smooth and be so DOP. Any advice?
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Old 09-11-2009
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Search for the throttle cable mod, that is most likely the solution.
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Old 09-11-2009
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Does the CEL come on when you turn the key to on before you start the truck ?
If not , the bulb may be burned out and you've had a problem right along and didn't know it.
If it does , have you tried pulling the codes from the PCM ?
Check fuel pressure at the rail.
Check / replace air filter.
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Old 09-11-2009
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Ok so i checked and the butterfly is fully open at full throttle. The CEL is not on at key on but the check gauges light is on. I don't know if it is supposed to be or not. i will do a search and try to figure out how to check for codes.
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Old 09-11-2009
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yeah i would check for codes. what you describe is one of the symptoms of clogged cats but it could be other things or a combination of other things. the cats are usually a casualty of other problems such as bad o2's or a leaky injector or something els that causes it to run rich. how long has it been since its had a tune up? (plugs, wires, fuel filter ect.)
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Old 09-11-2009
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A tune up, probably a year and a half, maybe two.
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Old 09-11-2009
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Quote:
Originally Posted by duval7 View Post
A tune up, probably a year and a half, maybe two.
was a fuel filter part of the last tune up?
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Old 09-11-2009
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Curious. When was the last oil change?
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Old 09-11-2009
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dude, 30 seconds for a 3.0 to get to 70? what are you complaining about! ill have to time mine 0-70 but id bet its about that long lol
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Old 09-11-2009
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Oil, probably 4-5k ago, but i am very easy on the truck and check the level evertime i fuel up. I usally go around 6k between changes becuase i am easy on it.
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Old 09-11-2009
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Originally Posted by duval7 View Post
Oil, probably 4-5k ago, but i am very easy on the truck and check the level evertime i fuel up. I usally go around 6k between changes becuase i am easy on it.
OK, just checking. Every once in a while, an engine mistakenly gets a double fill of crankcase oil during a change. The extra oil drag makes a VERY significant difference in acceleration even though the engine seems to run normally otherwise.
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Old 12-06-2013
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Well after about a year of setting i finally got it fixed! After me throwing a bunch of parts at it and two different shops working on it i figured i would try one last ditch effort to get it running before taking it to the recyclers. My grandfather, who gave me the truck years ago, told me to tow it down to his used car lot and let his shadetree mechanic look at it and i do mean shadetree. This guy is a really old black guy who has been working on cars for his whole life with no formal training, but if its an older car he would be my first choice. I would have took it to him first but his car lot is over 3 hours away. Anyway i dropped it off at his shop and he called me back about an hour later and said, "its fixed you can come and get it." Needless to say i was shocked at how fast he was. It ended up being the crank pully was cracked and had spun about 90 degrees on the shaft making it impossible to time. He swapped another pully from a 3.0 he had behind his shop and bame it ran like a charm. Well just wanted to give a long over due update. Nothing like having an old truck around to get some stuff done! Sorry to bump such an old thread but i hate researching problems and in the end people never update their results.
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