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Old 04-01-2013, 09:01 PM   #1
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Question Where did I go wrong?

Hello all.. Well I just recently purchased a 2000 focus Se with a 2.0L SOHC Engine. Upon getting it home I decided to change the oil, plugs and wires.. Before doing that I decided to run some seafoam through the vacuum line.. Used the stuff before and always been happy with the results.. So after smoking out the neighborhood I continued with the oil change and such.. after completion, got in, started it up and let it run.. within a minute or so of idling smoke started coming out around the catalytic converter.. So I shut it down to investigate thinking during the oil change I may have spilled some, but knew I didn't.. Got back in started it back up and same thing happens, so I thought maybe when I used the seafoam I didn't burn all the carbon out.. So I thought let me take it for a spin around the neighborhood and try to force it out.. Bad choice, it started running rough and engine light came on.. Got back to the house, popped the hood and smoke is coming out around catalytic converter again and now I'm hearing a crackling noise inside the cat. like there is a fire inside of it.. Eventually it subsides, so I grab my code scanner and get an error code P0301 (cylinder 1 misfire). So my question is would the catalytic converter cause that code or could it be something else first of all and cat is just residual from that? If so, what steps should I take to eliminate other possibilities?? Thanks in advance....


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Old 04-01-2013, 09:38 PM   #2
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A cat will not cause a misfire code normally, unless the cat is plugged up in which case you will probably get a random misfire code. You probably need to check your connections to the plug on cylinder 1 and the connection to the coil and perhaps a bad tuneup part. Just cause they are new doesn't mean they are a good part.
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Old 04-01-2013, 09:39 PM   #3
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pull the cat it will run better, you may have cleaned out the engine but the crap cant get past the cat. being the age it was probably on its last leg anyway.
reason its idling rough is the cats plugged and there is too much backpressure in the engine now, also the reason its smoking and crackling,,, it is burning.
pull it and replace it or have a pipe made, problem solved.
Never use seafoam on a high mileage or old engine the way you did, you're asking for trouble. pour it in the gas and call it good letting it work SLOWLY, not all at once.
and never add it to the oil of a high mileage or old car, you will have oil leaks you didn't have.
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Old 04-01-2013, 11:08 PM   #4
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jetrinka, after I got the code of a misfire in cylinder 1 I thought the same thing and decided to use the old plug and plug wire to see if it could have been a faulty plug or wire that I purchased.. But no change, still ran bad..

GreenEnvy, I have used seafoam on vehicles with way more miles then the focus. It only has 97,000 miles on it.. So I thought no problem, but your right I should had just added it to the gas..The cat will be replaced, but would that trigger a misfiring cylinder code..
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Old 04-01-2013, 11:32 PM   #5
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I have not ever and intend to never ever run seafoam in anything.

Haven't a clue what everybody thinks they are trying to remedy doing it. Look at what just happened here. Understand fully how the engine works and do all your own work and it seems to never be necessary.

I have never ever had to clean injectors either, always able to find the problem that allows car to go back to running perfectly.

Putting seafoam in engine oil is flat stupid to me.
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Old 04-02-2013, 12:28 AM   #6
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Its been successful for me in the past, but obviously I wont be doing that again.. But I still wanting to know if the cat would cause the error code or is that another issue in itself?
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Old 04-02-2013, 12:46 AM   #7
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By successful, just what do you mean? I'm looking for what you perceived as something better there.

No the cat shouldn't do that, if clogged it would run far worse at higher engine speeds and loads. Idle has so little flow through motor not much effect. Of course simply running all the seafoam through there could have wet a plug or something. Anything extra burning can light off a wet cat inside and then it melts, that's no good. Why you never should run car out of fuel nowadays.
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Old 04-02-2013, 12:54 AM   #8
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Yes it could be the cause, but take care of the cat first and see if it clears.
a misfire can be caused by alot of things, not just the plug or wires. you also could have set a code for it soaking the plug or flooding the cylinder temporarily with seafoam.
take care of the big problem before worrying about something small like a misfire.
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Old 04-02-2013, 01:06 AM   #9
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Quote:
Originally Posted by amc49 View Post
By successful, just what do you mean? I'm looking for what you perceived as something better there.

No the cat shouldn't do that, if clogged it would run far worse at higher engine speeds and loads. Idle has so little flow through motor not much effect. Of course simply running all the seafoam through there could have wet a plug or something. Anything extra burning can light off a wet cat inside and then it melts, that's no good. Why you never should run car out of fuel nowadays.
seafoam isnt run through at idle. Its run through at at higher rpm otherwise it tries to kill the engine. This is also where cat damage can occur on high mileage or older cars due to the high exhaust temps created. some get lucky and never have a problem.
others develop one right after treatment and dropping rpms down to idle where exhaust is cooler and the cat that got cooked starts solidifying into a big ol chunk... thats when the crapy idle, smoking, etc start because the exhaust is now pretty much plugged. Keep trying to run it that way and you soon ruin an aluminum head, valves, etc, due to extreme heat from exhaust backpressure.
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Old 04-02-2013, 08:49 AM   #10
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Lets not forget you may have more than one issue here. I would also make sure there isnt a leak in the vaccum line you messed with. If so that as well could cause a misfire.
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