CEL
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CEL
Hello everyone,
i am back and with a new issue, a much more simpler issue. Just recently I got a complete head re build and must say it is much more powerful and responsive. However as an s2k owner I get pretty maticulit and since running it for a week now I have gotten CEL codes for misfire in cylinder 2,3,4 and random misfire in any cylinder. I got new coils and plugs and was able to eliminate cylinder 3 misfire and only have codes for cylinder 2 and 4 misfiring.
i need help I am lost what this can be, I have adjusted valve lash twice and checked vacuum lines. Any opinions what this can be. I love the feeling of having my s2000 back but this CEL is driving to the brink!!
Also would an OBD scanner that has live data reading help determine this issue with two cylinders misfiring?
thanks everyone In advance.
i am back and with a new issue, a much more simpler issue. Just recently I got a complete head re build and must say it is much more powerful and responsive. However as an s2k owner I get pretty maticulit and since running it for a week now I have gotten CEL codes for misfire in cylinder 2,3,4 and random misfire in any cylinder. I got new coils and plugs and was able to eliminate cylinder 3 misfire and only have codes for cylinder 2 and 4 misfiring.
i need help I am lost what this can be, I have adjusted valve lash twice and checked vacuum lines. Any opinions what this can be. I love the feeling of having my s2000 back but this CEL is driving to the brink!!
Also would an OBD scanner that has live data reading help determine this issue with two cylinders misfiring?
thanks everyone In advance.
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Joined: Jan 2018
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Also my compression readings before the head rebuild.
1: 150 2: 160 3: 180 4: 165
After head rebuild
1: 225 2: 230 3:240 4: 242
all compression readings were done on warm engine.
mileage 111k 2002
1: 150 2: 160 3: 180 4: 165
After head rebuild
1: 225 2: 230 3:240 4: 242
all compression readings were done on warm engine.
mileage 111k 2002
Joined: Mar 2017
Posts: 672
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From: Waterford, MI - America's High Five
Have you pulled the plugs to check for any oil on them? Did you check the gap on the sparkies?
Just for shits and giggles it isn't a bad idea to swap the coil packs from cyls that are misfiring to non-misfiring cyls to see if they follow. I know they're new, but I've seen crazier things. Process of elimination type of thing.
Only a few things that can cause misfires:
1. Bad spark (bad gap, old plugsl, bad coils/bad contact)
2. Valves being out of spec
3. Oil in the combustion chamber (blow by, leak from valve seal, etc)
4. Low compression
I'll check back on this.
Just for shits and giggles it isn't a bad idea to swap the coil packs from cyls that are misfiring to non-misfiring cyls to see if they follow. I know they're new, but I've seen crazier things. Process of elimination type of thing.
Only a few things that can cause misfires:
1. Bad spark (bad gap, old plugsl, bad coils/bad contact)
2. Valves being out of spec
3. Oil in the combustion chamber (blow by, leak from valve seal, etc)
4. Low compression
I'll check back on this.
Joined: Jun 2016
Posts: 3,296
Likes: 260
From: Vermont
Have you pulled the plugs to check for any oil on them? Did you check the gap on the sparkies?
Just for shits and giggles it isn't a bad idea to swap the coil packs from cyls that are misfiring to non-misfiring cyls to see if they follow. I know they're new, but I've seen crazier things. Process of elimination type of thing.
Only a few things that can cause misfires:
1. Bad spark (bad gap, old plugsl, bad coils/bad contact)
2. Valves being out of spec
3. Oil in the combustion chamber (blow by, leak from valve seal, etc)
4. Low compression
I'll check back on this.
Just for shits and giggles it isn't a bad idea to swap the coil packs from cyls that are misfiring to non-misfiring cyls to see if they follow. I know they're new, but I've seen crazier things. Process of elimination type of thing.
Only a few things that can cause misfires:
1. Bad spark (bad gap, old plugsl, bad coils/bad contact)
2. Valves being out of spec
3. Oil in the combustion chamber (blow by, leak from valve seal, etc)
4. Low compression
I'll check back on this.
Also, maybe you mentioned this - but can a defect in the wire harness/connectors to the coils cause misfires.
OP - when you changed the plugs, were the old plugs oily? What did they look like?
Last edited by rpg51; Feb 20, 2018 at 06:42 AM.
Joined: Mar 2017
Posts: 672
Likes: 82
From: Waterford, MI - America's High Five
+1 missed that. Fuel can 100% cause this issue as well. Most of the time it is the injectors or fuel pump like stated.
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I dont know how but the S2000 saint of service is by my side.
Two days ago i replaced cylinder 2 and 4 fuel injectors with some spares i had and today the CEL turned off by itself! Woot! thank you so much every and wish everyone look on current and future services! on s200
may the s2000 saint of service be by your side!
Two days ago i replaced cylinder 2 and 4 fuel injectors with some spares i had and today the CEL turned off by itself! Woot! thank you so much every and wish everyone look on current and future services! on s200
may the s2000 saint of service be by your side!
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Joined: Mar 2017
Posts: 672
Likes: 82
From: Waterford, MI - America's High Five
I dont know how but the S2000 saint of service is by my side.
Two days ago i replaced cylinder 2 and 4 fuel injectors with some spares i had and today the CEL turned off by itself! Woot! thank you so much every and wish everyone look on current and future services! on s200
may the s2000 saint of service be by your side!
Two days ago i replaced cylinder 2 and 4 fuel injectors with some spares i had and today the CEL turned off by itself! Woot! thank you so much every and wish everyone look on current and future services! on s200
may the s2000 saint of service be by your side!
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Joined: Jan 2018
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That's hawk! I do have one more thing I need to solution before I feel it's 100% in my eyes. There's a ticking noise that started a few days ago but no cel for knocking. I don't know if it's for the reason I did a valve lash adjustment while it was warm or if it's the txt but I need this noise gone. My brother told me it's probably just a valve djusmrnet I did wrong while it was warm and not cold making it to lose.
Joined: Mar 2017
Posts: 672
Likes: 82
From: Waterford, MI - America's High Five
That's hawk! I do have one more thing I need to solution before I feel it's 100% in my eyes. There's a ticking noise that started a few days ago but no cel for knocking. I don't know if it's for the reason I did a valve lash adjustment while it was warm or if it's the txt but I need this noise gone. My brother told me it's probably just a valve djusmrnet I did wrong while it was warm and not cold making it to lose.
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