S10 spark plugs keep breaking and make it misfire??
A month ago I replace my delco sparkplugs because one of them was cracked from the side wall and looked like it exploded and causing my 2.2 s10 to missfire. It is starting to act the same way. When im driving slow in a high gear and then i step on it, it hesitates to gain speed and it backfires. It just started doing this again after I replaced sparkplugs for same reason. What could be causing this??
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Is the porcelain "cracking" or are they getting "carbon-tracked"? (see example photo of carbon-tracked plug below). It is common for carbon-tracking to occur if your original plugs were carbon-tracked and you replace the plugs without replacing the wires. If the plug is carbon-tracked, the boots on the wires or the coil boots (coil-on-plug ignition) are also carbon-tracked. If you do not replace the wires or the coil boots, the ignition will still misfire by following the carbon-track on the inside of the boot. This will cause your new plugs to also be carbon-tracked within a short period of time (days or weeks).
There is no reason I can think of for the porcelain itself to actually crack other than faulty installation techniques or possibly, cold liquids getting poured on extremely hot plugs.
REPLACE SPARK WIRES THAT COULD BE MISFIRE PROBLEM, ANY TIME OLD SPARK PLUG WIRES IS REMOVED THE WIRES WILL BREAK INSIDE PLUG BOOT CAUSING SPARK PLUG NOT TO FIRE.REPLACE SPARK PLUG WIRES.CLEAN FUEL INJECTORS, CHANGE AIR FILTER,CHECK ALL VACUUM HOSES ON THE INTAKE MANIFOLD LOOKING FOR INTAKE VACUUM LEAKS.
Check ignition lead - ignition cap and sparkplug. look signs of wear or cuts on the lead. The cap should be tight on the sparkplug. The sparkplug must be free of cracks and not unusually blacked out. Replace if in doubt.
Quick test is to open the hood in the dark. Let someone start the car and look for blue sparks around the lead and sparkplug cap. Be careful - keep away from moving parts.
They should be CR43TS AC Delco spark plugs. be sure you dd not crack the porcelin when installing them. if you know which one is misfiring take it out and look it over ,for any cracks and ck the gap gap should be .045 the decal under the hood should also have the gap spec.
If the starter/Battery are ok.Check for spark by pulling off a sparkplug wire,have someone try to start hold wire near sparkplug tip you'll hear the spark jump to the plug tick..tick..tick..sound.Be carefull to hold wire just far enough to hear spark,also this is the secondary circuit from the coil it's high voltage wear a glove.If you smell gas youre geting gas if no spark it is 1 of the following.Bad Coil, or ignition modulator, crack in distributer, cracked wires that cause spark to not reach plugs.Good Luck.
Also, Takeout #1(from front of the car on your left) and #2 and compare two plugs. perheps #2 sparkplug is white(at contact point), Than you are in deep troble(head gasket problem, white smoke comes out of tailpipe) like I have.