dented header and open NA exhaust causing misfire
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Joined: Apr 2003
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From: Presidio of Monterey, CA
dented header and open NA exhaust causing misfire
I just swapped in a b18b and my exhaust is not properly bolted up, until I get some exhaust work done. The DC 4-2-1 one is dented prettly badly on one of the runners. Basically the flange is too big for the stock b-pipe.
It bogs real bad and I can tell it's misfiring at low rpms and part throttle, but feels fine at full throttle and sometime it throws random codes 73 & 74, which are misfire codes. I'm thinking it's the exhaust causing this, I just want to know if anyone can confirm it.
Since I've bolted the header so it doesn't seperate anymore it is alot better but still misfires, which is why I think it's the header.
It bogs real bad and I can tell it's misfiring at low rpms and part throttle, but feels fine at full throttle and sometime it throws random codes 73 & 74, which are misfire codes. I'm thinking it's the exhaust causing this, I just want to know if anyone can confirm it.
Since I've bolted the header so it doesn't seperate anymore it is alot better but still misfires, which is why I think it's the header.
Honda-Tech Member
Joined: Apr 2002
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From: oakland, ca, usa
Re: dented header and open NA exhaust causing misfire (EKRacer)
the dent will only cause the motor to flow restrictively... never misfire(atleast from my expeirence).... my buddy had that misfiring thing a while ago and it was the spark plug wires, but in your case its fine in the higher RPM's... i still say check the wires if you havent already...
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From: Milwaukee, WI
Re: dented header and open NA exhaust causing misfire (DOHCtorTHRUST)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DOHCtorTHRUST »</TD></TR><TR><TD CLASS="quote">the dent will only cause the motor to flow restrictively... never misfire(atleast from my expeirence)...</TD></TR></TABLE>
Excesive back pressure can cause some reversion, which can actually get back into the combustion chambers, which can lead to either a "dead" cylinder or a lean condition.
Otherwise, check your spark plugs (make sure they're gapped correctly), check the wires for any loose connection/worn insulation/etc.
Excesive back pressure can cause some reversion, which can actually get back into the combustion chambers, which can lead to either a "dead" cylinder or a lean condition.
Otherwise, check your spark plugs (make sure they're gapped correctly), check the wires for any loose connection/worn insulation/etc.
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From: More Rock, Less Talk., CA
Re: dented header and open NA exhaust causing misfire (EKRacer)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EKRacer »</TD></TR><TR><TD CLASS="quote">I also have not yet properly set the ignition timing, if that has anything to do with it.</TD></TR></TABLE>
uhh....yeah
uhh....yeah
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Joined: Feb 2000
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From: Milwaukee, WI
Re: dented header and open NA exhaust causing misfire (EKRacer)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EKRacer »</TD></TR><TR><TD CLASS="quote">I also have not yet properly set the ignition timing, if that has anything to do with it.</TD></TR></TABLE>
LOL! Yea, that has alot to do with it.
LOL! Yea, that has alot to do with it.
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