HELP!!!
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W203 c240 2002
HELP!!!
My 2002 c240 160000 miles has a misfire on cylinder 4 i tested all injectors with noid light they all show light on and off so they all work and get current but as soon as i step on gas on park and rev up to 4 rpms or drive up to 40 mph my CEL comes on misfire cylinder 4 so i checked before like i said with noid light it works and after the misfire i checked with noid light again and injector for cyli der 4 is not firing light wont come on so it works when i reset CEL but as soon as i rev up to 4 rpms CEL comes back any ideas if my ECU is bad?
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W203 c240 2002
idk number but i got all original from orilleys all cylinders work except number 4 when i rev up to 4 rpm CEL comes on and with noid light my injector was working before reving but after revimg when CEL comes on it shuts off injector im gonna go see if it shuts off spark to my cylinder aswell and let you know
Last edited by Chris209; Nov 21, 2019 at 12:35 PM.
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C320
idk number but i got all original from orilleys all cylinders work except number 4 when i rev up to 4 rpm CEL comes on and with noid light my injector was working before reving but after revimg when CEL comes on it shuts off injector im gonna go see if it shuts off spark to my cylinder aswell and let you know
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W203 c240 2002
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w203 , w204
First swap the coil from 4 to 3 turn on the motor that's it for the misfire goes to number three cylinder and then the fault is the coil.
If the misfire stays on number for them swap the spark plug from number 4 to number 3 cylinder.
If the misfire goes to number 3 cylinder then the faults in the spark plug if the misfire stays on number 4 cylinder then swap the injectors from 4 to 3 cyclinders.
If the misfire goes to number 3 cylinder replace the injectors however if it still stays on number 4 you have either an ECU problem wiring harness problem or the valves are carbon up.
Let us know how go
If the misfire stays on number for them swap the spark plug from number 4 to number 3 cylinder.
If the misfire goes to number 3 cylinder then the faults in the spark plug if the misfire stays on number 4 cylinder then swap the injectors from 4 to 3 cyclinders.
If the misfire goes to number 3 cylinder replace the injectors however if it still stays on number 4 you have either an ECU problem wiring harness problem or the valves are carbon up.
Let us know how go
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Thread Starter
Newbie
Joined: Nov 2019
Posts: 13
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W203 c240 2002
First swap the coil from 4 to 3 turn on the motor that's it for the misfire goes to number three cylinder and then the fault is the coil.
If the misfire stays on number for them swap the spark plug from number 4 to number 3 cylinder.
If the misfire goes to number 3 cylinder then the faults in the spark plug if the misfire stays on number 4 cylinder then swap the injectors from 4 to 3 cyclinders.
If the misfire goes to number 3 cylinder replace the injectors however if it still stays on number 4 you have either an ECU problem wiring harness problem or the valves are carbon up.
Let us know how go
If the misfire stays on number for them swap the spark plug from number 4 to number 3 cylinder.
If the misfire goes to number 3 cylinder then the faults in the spark plug if the misfire stays on number 4 cylinder then swap the injectors from 4 to 3 cyclinders.
If the misfire goes to number 3 cylinder replace the injectors however if it still stays on number 4 you have either an ECU problem wiring harness problem or the valves are carbon up.
Let us know how go
