Misfire In cylinder 2 - Toyota Nation Forum : Toyota Car and Truck Forums

bmsmith7 · 06-09-2009, 02:32 AM

Having Problems With a Misfire In cylinder 2 found soot on sparkplug and coil plug woundering if anyone had any idea as to the cause alson seems to quit missing after I get over 2500rpm replaced sparkplugs and that fixed it for about 500 miles now it's starting to do it again 2003 Matrix XRS 2zz-ge obd II p0302

fishexpo101 · 06-10-2009, 11:32 AM

Heavy soot on the plug might indicate that cylinder is burning oil - assuming that the coil pack is fine. Try switching it with another plug and see if the misfire follows the coil or stays with the cylinder. Since new plugs "seemed" to fix it - I would suspect something with the cylinder.

Could also be a damaged signal wire in the ignition harness / connector feeding the #2 cylinder. Little harder to check that electrically (need a multimeter, maybe a signal injector - probe) - but a good visual inspection can catch any obvious signs of damage, burnt, discolored, worn insulation on wires, etc.

Try a compression test - compession on the cylinder should around 200's PSI, minimum is 145 PSI. Should be no more than 16 PSI difference between cylinders. If this is not the case - you have to do some more diagnostic work to find out what is causing the problem. Could be anything from a bent valve, damaged valve seat, to stuck piston rings, to leaky valve seals.

bmsmith7 · 06-10-2009, 11:27 PM

Thanks for the help I switched the coil pack the misfire follows the coil pack ordered one today but does that explain the soot the car does have over 300,000 miles so I do expect it to burn some oil but the other cylinders do not have the soot.

fishexpo101 · 06-11-2009, 01:14 PM

bmsmith7 - good to hear. A potential coil on plug igniter issue is much less of headache to deal with.

Wow! 300K miles on your 2003 XRS, I've got a paltry 110K miles on mine. Toyota does indeed make nice wearing engines.

bmsmith7 · 06-12-2009, 01:20 AM

yes still waiting on coil but i will warn you that the odometer stops at 299,999 miles it does this on all toyotas 2003 - 2008 with digital odo's and it's a $1000 fix so needless to say i really don't know how many miles mine has since it stopped a year ago!