this a 4g63 problem I'm having, but it fits in performance/engine (who checks the 4g63 section anyway)
Engine throws a code P0304 -cylinder 4 misfire. Idles horrible, but engine smooths out in higher rpms.
And a new plug looks like this after 50 miles (see the plug 4 on the very right of picture)
New wires, new plugs, same problem. Dino said by the look of the plug, it was stuck open / leaking / failed injector. Replaced the injector. no change.
Checked ignition coils. Secondary is within range. Primary is slightly out:(ref range is 0.7-0.86 kOhm) - 2&3 terminals 1.2 Ohms - 1&3 terminals 1.2 Ohms
Don't know if that's enough difference to cause the ignition coil to fail. And don't see how that could cause just cylinder 4 to misfire. I would think both cylinder 4 and cylinder 1 would misfire.
Are there any sensors that will cause just a single cylinder to misfire?
2gnt: '99 RS-T, killed by a toyota, pending rebuild... Daily: Volt Daily #2: '99 EVG ebike- STOLEN by PEDRO
#99517, "RE: cylinder 4 misfire is no joke" In response to Reply # 0
Could be a valve if it wasn't the injector. Do a compression test.
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'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#99526, "RE: cylinder 4 misfire is no joke" In response to Reply # 2 Jun-25-06 05:44 PM by ez
I got a compression tester from autozone, will do that next.
Here's something else I just noticed. When you first turn on the engine, it idles FINE for 5-15 seconds. Then it starts to idle like crap. If you turn off the car, and then turn it on again a short time later, it will idle bad from the start. so it only happens if the engine is a little warm. hmmm...
Another guy at tooners had a 3rd cylinder misfire and the same situation as me - turned out to actually be an O2 sensor! I hate 4g63s
EDIT: compression is fine. It looks like a rat has been eating some rubber hoses. I haven't found any punctured hoses yet, but if this is all due to a vacuum leak... it's time to get another cat.
2gnt: '99 RS-T, killed by a toyota, pending rebuild... Daily: Volt Daily #2: '99 EVG ebike- STOLEN by PEDRO
#99543, "RE: cylinder 4 misfire is no joke" In response to Reply # 3
And get normal copper plugs. You have some janky iridium and dual electrode crap there. NORMAL STOCK NGK. Just because the sooper +2 platinidiumextract quad core dual xeon sparkplugs cost $8 each instead of $2, doesn't mean theyre better.
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