misfires and coil testing
Thread Starter
Teching In
Joined: Mar 2021
Posts: 4
Likes: 1
From: Southport, NC
misfires and coil testing bought a 1998 camaro z28 with 5.7l. Car has 199k miles, previous owner said he let it sit for a couple years starting it every now and again. the car starts and runs, with a misfire, that disappears over 2500 rpm, but still lacks power overall.
I have begun to pull the ignition coils, and working on getting cylinder 8s spark plug out which is a pain all by itself.
OBD 2 codes are as follow
P0327: KNOCK SENSOR 1:CIRCUIT LOW BANK 1 OR SINGLE SENSOR
P0332: KNOCK SENSOR 2:CIRCUIT LOW BANK 2
P0308: CYLINDER 8 MISFIRE DETECTED
I have also been OHM testing the coils from the car with results as follow, note that this is from prong to prong testing, i could be completely wrong in my testing practices, but im open to new testing ideas, i just dont know how so this is what ive tried.
CYLINDER 8 IGNITION COIL
200K OHM TEST
P1 TO P2= 112
P1 TO P3=113
P1 TO P4=71
P2 TO P3=12
P2 TO P4=40
P3 TO P4=40
I also pulled coils 2-4-6 for testing, with test also going hand in hand with the ignition coil from the cylinder 8 misfire. I do want to note that I tested the new coils i am installing with test results completely different, i will post them below as well.
NEW COILS
200K OHM TEST
P1 TO P2=0
P1 TO P3=0
P1 TO P4=17
P2 TO P3=10
P2 TO P4=0
P3 TO P4=0
I will have the spark plugs out and swapped hopefully tomorrow, that will also give some insight depending on how the plugs look, what worries me is all the coils ive tested show the same result on this one side with none being close to what a new coil should test at, am i testing wrong? Or am i just dealing with a bigger issue than i am aware of. any insight would be helpful.
Im also looking into how to test my knock sensors and anything it deals with. just hoped this would be the easiest step to complete first.
I have begun to pull the ignition coils, and working on getting cylinder 8s spark plug out which is a pain all by itself.
OBD 2 codes are as follow
P0327: KNOCK SENSOR 1:CIRCUIT LOW BANK 1 OR SINGLE SENSOR
P0332: KNOCK SENSOR 2:CIRCUIT LOW BANK 2
P0308: CYLINDER 8 MISFIRE DETECTED
I have also been OHM testing the coils from the car with results as follow, note that this is from prong to prong testing, i could be completely wrong in my testing practices, but im open to new testing ideas, i just dont know how so this is what ive tried.
CYLINDER 8 IGNITION COIL
200K OHM TEST
P1 TO P2= 112
P1 TO P3=113
P1 TO P4=71
P2 TO P3=12
P2 TO P4=40
P3 TO P4=40
I also pulled coils 2-4-6 for testing, with test also going hand in hand with the ignition coil from the cylinder 8 misfire. I do want to note that I tested the new coils i am installing with test results completely different, i will post them below as well.
NEW COILS
200K OHM TEST
P1 TO P2=0
P1 TO P3=0
P1 TO P4=17
P2 TO P3=10
P2 TO P4=0
P3 TO P4=0
I will have the spark plugs out and swapped hopefully tomorrow, that will also give some insight depending on how the plugs look, what worries me is all the coils ive tested show the same result on this one side with none being close to what a new coil should test at, am i testing wrong? Or am i just dealing with a bigger issue than i am aware of. any insight would be helpful.
Im also looking into how to test my knock sensors and anything it deals with. just hoped this would be the easiest step to complete first.
Last edited by Shrader187; Mar 31, 2021 at 07:48 PM.
