Like the title says. I just used it in my wife's car, 1998 civic lx 4 door manual. My concern is that smoke started coming from around the threads of the o2 sensor in the exhaust manifold. I have researched this and couldn't find anything about this issue. Should I be concerned? Do I need to replace it?

 

i use seafoam all the time and have never had a problem with it. how long ago did you seafoam it

 

Just this morning. As I was running it thru, that's when I noticed it coming from the 02 threads.

 

seafoam breaks down and removes all the crap built up in the motor and in the system. the car will smoke for awhile after you use it but thats normal. did you just put it in the oil?

 

Not this time. Just the gas tank and thru the vacuum line.

 

yea thats what i do. i take the can and split it into 3rds (1 in the oil, 1 in the gas, 1 thru the vac lines). after you put it in did you let the car sit for a couple of min then start it and let it run

 

Yeah, then had to drive it a little while to expel the rest of it. The car always ran ok, now its smoother and quieter. Just a little nervous about those threads.

 

you might wanna try to tighten the sensor up a lil but i really wouldnt be to worried about it...... if it continues i would look into it more tho

 

your exhaust manifold is cracked.....take your heat shield off and look for a crack around the o2 sensor..you only noticed it because of the white smoke due to the seafoam..honda's cast manifolds are prone to cracking...see it at work everyday..mine's cracked too....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spray_bombed &raquo;</TD></TR><TR><TD CLASS="quote">your exhaust manifold is cracked.....take your heat shield off and look for a crack around the o2 sensor..you only noticed it because of the white smoke due to the seafoam..honda's cast manifolds are prone to cracking...see it at work everyday..mine's cracked too.... </TD></TR></TABLE>

Sounds that way - he probably had a crack that was plugged up nice with carbon and then when you kill the carbon with seafoam it becomes unplugged - you see it all the time, it's one of the bad things about using seafoam, sometimes the carbon is helping you - this is especially known on piston rings (the carbon seals them up then a seafoam later they have blowby).

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmhondas &raquo;</TD></TR><TR><TD CLASS="quote">yea thats what i do. i take the can and split it into 3rds (1 in the oil, 1 in the gas, 1 thru the vac lines). after you put it in did you let the car sit for a couple of min then start it and let it run</TD></TR></TABLE>

If I remember it correctly you're supposed to feed it through the vacuum lines while the car is running, that's how it steams the system, if the car is off it's not really pulling anything therefore isn't steaming a whole lot, just one area.

 

yeah even though it says on the bottle to shut the car down....I never have either...I always leave it running..feed through the brake booster and have someone throttle it enough to where it doesnt stall.... always worked well for me