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Jack of all trades, Master of none
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600 Posts
Discussion Starter #1 (Edited)
Okay, so I just finished swapping in a 99 crown vic tranny in my 95. Everything is bolted back up, no broken parts or anything like that. I fire it up and it sounds like it's idling normal. I go ahead and add a 1/3 can of seafoam, turn it off for about 5 min and then hop in it. Again, idles ok, not great, but when I take off, it runs like it is in safe mode or something, after a few minutes the CEL came on. I reset the computer and the same thing happened. The only thing that I can think of are the O2 sensors. Any ideas? It's gonna be a long drive to work tomorrow.
 

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Jack of all trades, Master of none
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600 Posts
Discussion Starter #2
Well, I just spent another hour looking everything over. Made sure all the O2's were plugged in, everything else down there was plugged in and looked ok. I repinned the harness, it seems to work fine, no flashing lights or anything. It shifts through all the gears fine. I reset my computer again, and this time no CEL, at least for the past hour. I checked all my vaccum hoses, and wires under the hood, thinking maybe I knocked something loose, didn't see anything.
Basically, the car sounds normal at an idle. But as soon as you give it some throttle, there is some hesitation and some missing. When you put it in gear, it gets worse. From a stand still, it is horrible but once you get rolling and get to about 35mph or so it feels a little more responsive, but not great. There shouldn't be anything transmission related causing this, should there? It really seems vaccum related, or something similar, almost like it's only running on 4 cylinders.
 

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Fry Rice Specialist
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4,794 Posts
where you put in the saefoam?
 

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Jack of all trades, Master of none
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Discussion Starter #5
Well, after some searching on here I have an idea. Could it be possible that when I used the seafoam, I may have fouled out some plugs? Like I said, I used the vaccum hose up on the brake booster, and this is the first time it's seen seafoam. Plugs are less than a year old. Just thinking that maybe all that "cleaning" that the seafoam did may have crapped out my plugs. Guess I'll pull a few before work in the morning and see.
 

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Jack of all trades, Master of none
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600 Posts
Discussion Starter #6
Well, the plugs looked good. I did find one thing though. I noticed, I must have forgotten or been lazy, but my drivers side exhaust was not bolted on good. I put one bolt in, and it was missing one bolt. It sounds like it's leaking from there, right where the exhaust bolts to the manifold. Would a leak before the O2 sensors cause it to run in "safe mode"?
 

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Jack of all trades, Master of none
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600 Posts
Discussion Starter #7
Okay, well I think I may have an idea. I didn't get a chanve to try and fix it yet, but I crawled under the car this morning and was checking the O2 sensors. On the drivers side, the rear sensor, I reached up and felt it and noticed there was what felt like a torn wire. There was some bare wire that seemed like it was ripped. If I accidentally ripped a wire loose, would that cause the limp home mode?
 

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Fry Rice Specialist
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4,794 Posts
all you said above is possible.

i have spark plug about 7k to 8k miles on it and after seafoam it took a crap on me too. the plugs look perfectly fine but once a new one going in voila, no more misfiring.
 
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