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89 Dak3.9L
Dodge Dakota
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1/09/2004
01:52:21
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 Subject: Can't...go...any...faster...
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Message:
I just replaced the o2 sensor in my 1989 3.9L V-6 because it snapped in half (I dunno, do they DO that?). Now I'm trying to cycle the engine by taking it on the freeway. I got it up to 60 (after heavy hesitation and lurching) but then it just slowed down. Pedal to the floor, and I slowly leveled out around 30 mph. What the heck is goin' on?
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blacksunshine
Dodge Dakota
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1/09/2004
03:27:02
|  RE: Can't...go...any...faster...
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Message:
ouch snapped in half, never good anyways heres a few suggestions heaving delt with massive problems in fuel injection lately.
Hopefully you replaced all your o2 sensors at once, since theres usully more than one, i am not exactly sure were there located on the dakota a shop manual should have them listed in it though. Whenever you replace one sensor dude to age+damage its usully wise to do the other sensors in your vehical. (little late for me right now so i am not gonna list em all to lack of ability to remember them all after being awake this long) would also check to make sure the computers had power removed from it for a little while so it can relearn the setting changes.
Personally thats what i would go about checking out. you can also check out all your sensors once you have located them with a volt meter, usully by switching it to resistance mode, so you can check those sensors to try to isolate the problem without spending money.
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daddio
Dodge Dakota
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1/09/2004
08:39:28
| RE: Can't...go...any...faster...
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Message:
plugged cat
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Jon
Dodge Dakota
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1/09/2004
10:23:34
| RE: Can't...go...any...faster...
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Message:
It does sound like a plugged cat. If the truck was running really rich before due to the bad sensor it could melt the cat shut.
If you installed the wrong o2 sensor or something like that it could cause a drivability problem (if it was the front sensor) but i have never seen it that bad. Try unscrewing the front o2 sensor out of the exhause and take it for a ride. That will let pressure escape and if the truck runs good you know the exhaust is restricted, whether its a plugged cat, muffler, or a bent pipe.
-Jon
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