OK, nevermind... Iím a moron.
After figuring out what was the water temp gauge sensor, the water
temp for the ecm sensor, and thoroughly checking all the wires and
connectors around there, I noticed that with my head close to the
valve cover, I could hear a faint clicking sound when the engine was
stumbling at idle... plug wire!
I had just replaced the wires about a year ago and probably havenít
put more than 6k miles on the car since then, so I really thought they
were good... good enough to disregard them as the culprit and good
enough to say I had changed them ;)
Cylinder 4 plug wire was arcing through the plug boot, down at the
plug. I was able to pull the upper part of the boot back and see the
pretty light show down in the hole. I put a few wraps of Super 33
electrical tape around the boot, put it back in, and the car runs
fine. Iíll be buying a new set of wires tomorrow.
I really thought the problem had something directly to do with the
Sometimes the obvious is just not obvious enough.
> Hi All!
> My '90 LX just developed a misfire problem today and I'm
> hoping someone may have some insight.
> 1990 Accord LX, 5-Speed, 127k miles.
> I'm no pro mechanic, but I've done most of my own work on my
> cars and motorcycles for the last 25 years. I definitely know
> my arse from a 12 point, 3/8" drive, Snap-On Flank Drive, deep
> Anyhow, here's the story... I replaced my radiator last week
> due to a small crack in the top tank. While I was at it, I
> also replaced the radiator hoses and the thermostat. I was
> very careful to put everything back in as it was supposed to
> be and the job turned out ok... no leaks and the car ran fine.
> Today, when I was getting off the freeway, (highway, for those
> of you outside CA) I felt the car misfiring/skipping, like it
> wasn't running on all 4. It was not a totally constant
> misfire, through all RPMs and loads. Most noticably, it did it
> at low to mid RPMs, under medium load. The idle would
> fluctuate from normal to misfiring. I could get the car to
> buck pretty good at part throttle, 3rd gear, accellerating
> moderately. The car started back up ok after making a few
> stops too. No check engine light.
> I already took care of the obvious and changed out the cap,
> rotor, wires, and plugs, but no luck. All wires and hoses in
> the areas I worked on were also double checked... everything
> was connected and tight.
> When changing the spark plugs, a couple of them were only
> finger tight, but no signs of compression burn-by or anything
> like that. I gapped the new ones at .044", used some copper
> anti-sieze on them, and torqued them properly. Also possibly
> worth noting... there was some oil on the plug boots down in
> the holes and also a little bit in the very bottom of the
> distributor, but not really enough to worry about.
> So, the car continues to misfire.
> Is there anything obvious that I may be missing?
> What sensors are in the area of the lower/rear radiator hose
> that I may have knocked into and possibly should re-examine?
> Any other thoughts?
> TIA! -Joe
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