Hi, I'm new and the spark plug blew out of my CRX Si's head leaving a stop light under normal accelleration. I proceded to go about a minute with engine still running and after installing new spark plug to get home it, at low rpms, will skip or "misfire" but at high rpms it is fine. I tried with ac on and off and it seems to act the same. I intend to replace all spark plugs. Did I ruin something to make it "misfire"? Thanks for any help anyone can give me. Lew

 

The threads have probably stripped meaning it will most likely happen again with putting new plugs in. was the plug only hand tightened before it happened?
You might get stuck having to rip the head off to re-tap the threads.

 

Thank yo for your reply. The old spark plug looked as if it had been pulled out by the last two threads. The new plug went in really easy and torqued down really well. I think the old plug was on it's way out when compression finally blew it out at it's last two threads. What I'm trying to figure out is why it's misfiring at low rpms and smoothes out at higher rpms. Does anybody think it has anything to do with the freshness of the new platinum plug mixed with 3 other stock NGK plugs? I might have wrecked something electronically by keeping the engine running on 3 cylinders?

 

you might be lucky and it might have vibrated loose, just get new ones ( only NGK's please) and put the new ones in and see what happens, don't over-tighten them but make sure they are snug. also use anti-seize on the spark plug threads, make sure they are gapped to the specs on the sticker under the hood, dont use the platinum plugs especially if its a bosch, honda's dont like them. maybe the new plugs gap is wrong. I would also get new wires( dealer or NGK ) and a new cap and rotor as well

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Crx Jimmy &raquo;</TD></TR><TR><TD CLASS="quote">dont use the platinum plugs especially if its a bosch, honda's dont like them.</TD></TR></TABLE>When you say this, you are talking about the stock D-series engines, right?

 

Spark plug thread repair can be with a TIME-SERT without removing the head.

http://www.timesert.com/html/sparkplug.html

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by davidf &raquo;</TD></TR><TR><TD CLASS="quote">Spark plug thread repair can be with a TIME-SERT without removing the head.

http://www.timesert.com/html/sparkplug.html

</TD></TR></TABLE>Personaly, I wouldn't use these tools on an installed head.

 

Just get four new plugs (NGK) and see if it solves the problem. I always found the platinums to make stock D-series engines run a little rougher.

 

A fistful of lithium grease, and only doing 1/4 to 1/2 turn at a time and it will be fine. I did it on my old stock d16 no problem.

Oops, i thought that was a tap. I havent used a timesert.

 

 

what about the metal that enters the cylinder chamber when you tap the head on the block?

 

maybe your wires? have you checked those yet?

 

did you gap the plugs at the right gap?

also might have a loose wire.