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Running rich after installing new fuel injector, 97 caravan
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jared80
New User
May 4, 2013, 6:03 PM
Post #1 of 5
(2771 views)
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Running rich after installing new fuel injector, 97 caravan
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1997 Dodge Caravan, 3.0L V6. A while back got a CEL and P0204 (fuel injector circuit problem, cyl 4). Since we've had a couple injectors go bad over the past couple years, I thought I'd save some money, learn something new, and try to replace this one myself. (I'm a general diy'er but not very experienced with car repair.)
Bottom line: after replacing the injector, there is no more CEL but I think the engine is now running way too rich. Got white smoke from the exhaust, fuel smell, poor performance, and even some popping sounds when accelerating. Oxygen sensor (bank1 sensor1) is reading .9v at idle with fuel trim -10% to -25%. Rear sensor (bank 1 sensor 2) is reading .6v at idle with fuel trim +99%. Revving the engine brings first sensor down to .3-.4 volts but still negative trim. Would the first o2 sensor still move around if it's bad? Or would it be stuck at some voltage?
Longer version with more clues: I actually replaced the cyl4 injector twice. I thought the first one was faulty and leaking, so I tried another. No change. During the first operation, I accidentally spilled some fuel out of the rail straight into cylinder 4 (could that have fouled the o2 sensor and caused the issues?). I also replaced the thermostat during the process since it's right there by the fuel rail and the car has had some intermittent cooling issues. But I can't imagine that could cause the engine to run rich.
My theories so far: (1) something I did caused the o2 sensor to fail ... may try replacing that next. (2) I forgot to hook something back up properly, but I'm sure I double checked. (3) maybe the injector wasn't bad after all and it's the wiring leading into it? But then why did I only get the current symptoms after replacing the injector?
What are the most likely culprits for this problem? I'm not sure where to start. Thanks, any advice appreciated.
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Discretesignals
Ultimate Carjunky
/ Moderator
May 4, 2013, 6:32 PM
Post #2 of 5
(2754 views)
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Re: Running rich after installing new fuel injector, 97 caravan
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Did you check to see if the injector control circuit isn't grounded out and making the injector turn on 100%?
What was the replacement injector?
Does it have the same ohms measured with a ohm meter as the other injectors?
What kind of test equipment do you have?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on May 4, 2013, 6:32 PM)
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jared80
New User
May 5, 2013, 10:20 PM
Post #3 of 5
(2707 views)
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Re: Running rich after installing new fuel injector, 97 caravan
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I didn't check the control circuit yet. I do have a multimeter, but really no specialized automotive testing gear. I've got no time right now to take things apart again and get down to the rail, but I'll report back when I get the chance.
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jared80
New User
May 6, 2013, 4:57 PM
Post #4 of 5
(2686 views)
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Re: Running rich after installing new fuel injector, 97 caravan
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Replacing the o2 sensor and changing the oil seems to have solved it (cross fingers). There was quite a bit of fuel in the oil, possibly from my spill into the cylinder or from the malfunctioning injector, which was probably fooling the system into thinking it was running rich. The smoke was probably thin oil getting burned.
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Discretesignals
Ultimate Carjunky
/ Moderator
May 6, 2013, 5:29 PM
Post #5 of 5
(2684 views)
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Re: Running rich after installing new fuel injector, 97 caravan
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If you get a lot of unburnt fuel into the exhaust, it will put out white smoke and make you think you just blown your head gasket. The difference is the white smoke from raw fuel in the exhaust will burn the heck out of your eyes.
Glad to read you got it resolved.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on May 6, 2013, 5:29 PM)
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