5.2 not running well all of a sudden
Hi all! Been awhile since I've posted. I've got a '95 Ram 1500 5.2, 4x4. It's always ran as smooth as any car I have. But all of a sudden, it started running rough and doesn't have full power. It literally happened overnight. I filled it up with gas, towed a trailer about 150 miles, ran great. Next morning, it idled funny, and when I went to drive away, it shuddered and shook. Feels like a misfire. But there are no codes being flashed.
So I checked the plugs (good), put new plug wires on, replaced the cap and rotor, cleaned the throttle body, checked the fuel pump pressure (good), checked the injector (had power), checked the o2 sensor, checked the TPS and the IAC sensor, and called the gas station to see if they got some bad gas (good). I put an emissions machine on the tailpipe and the hydrocarbons are off the scale. So I figured the problem must still be electrical. I then replaced the front coil, and that made it run better, but still not perfect. I'm really scratching my head on this one! Any guesses on what else this problem could be? Thanks guys. |
Running rich... so, maybe a temp sensor, maybe a failing crank sensor. Have an O'scope you can put on it, and see what coil output looks like?
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How old are the o2 sensors?
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You checking the O2 sensor but I would replace it. Cheap and easy.
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Originally Posted by racefan41
(Post 3398859)
How old are the o2 sensors?
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Originally Posted by HeyYou
(Post 3398849)
Running rich... so, maybe a temp sensor, maybe a failing crank sensor. Have an O'scope you can put on it, and see what coil output looks like?
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Originally Posted by Ramman18
(Post 3398886)
You checking the O2 sensor but I would replace it. Cheap and easy.
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Originally Posted by desert ram 1500
(Post 3398913)
That is certainly cheap and easy. But wouldn't a bad O2 sensor throw a code?
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You can test the O2 sensors by simply unplugging them. If the engine runs better, sensors are bad, if it still runs the same, your problem is elsewhere.
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Originally Posted by desert ram 1500
(Post 3398913)
That is certainly cheap and easy. But wouldn't a bad O2 sensor throw a code?
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