Need help with CEL codes
02-09-2011, 08:07 AM
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Need help with CEL codes
I have a 2001 AP1, just intake and exhaust. I have a few CEL codes that I need some help with, and diagnosing what the problem is. The codes are P0301 and P0302 for misfiring in cylinders 1 and 2. Also a code will come up for a random misfire. Those are the only codes I have
I can't figure out the problem. When I first start the car cold it will idle and run great but the CEL light will be there. I won't notice a misfire until even after the engine has gotten to operating temperature. I can be driving around for about 30 minutes before it will miss at all. If I shut the engine off and let it cool down I can drive around for awhile and it will run good for awhile. After the missing does start the CEL light will flash.
I was wondering if anyone has had this issue before. I don't believe the valves need to be adjusted because the miss doesn't happen when the car is cold.
Any input would be great, thanks a lot for reading.
I can't figure out the problem. When I first start the car cold it will idle and run great but the CEL light will be there. I won't notice a misfire until even after the engine has gotten to operating temperature. I can be driving around for about 30 minutes before it will miss at all. If I shut the engine off and let it cool down I can drive around for awhile and it will run good for awhile. After the missing does start the CEL light will flash.
I was wondering if anyone has had this issue before. I don't believe the valves need to be adjusted because the miss doesn't happen when the car is cold.
Any input would be great, thanks a lot for reading.
02-09-2011, 09:59 AM
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02-09-2011, 10:29 AM
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Originally Posted by MONEYPIT,Feb 9 2011, 11:01 AM
ive got the same problem. havent figured it out yet. Changed coilpacks, injectors, valve adjustment, map sensor (also map whack)...let me know when you figure it out. 
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02-10-2011, 12:10 PM
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I dont believe the seconday air pump could throw a misfire code on an S2000. It pumps air after the combustion chamber. I'd love to see where you read that. That is not your problem.
02-12-2011, 03:17 AM
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Have you replaced the spark plugs (checked for proper gap)? I would imagine you have since you have done all the other usual suspects already, but you did not mention it here.....
02-12-2011, 06:16 PM
#10
Maybe a dumb question but I'm in this guys boat. I have a similar post open and I don't intend to hijack yourt thread. Just some input.
I had oem ngk platinum injectors installed. A local mechanic did all the work and he had never worked on a S2000 before.
Do the oem NGK's need to be regapped upon installation? If so, I have no idea what they are gapped at currently but it semi fixed my problem. My car idles fine and revs fine. Big issue is when I put a load on the motor. Some slight hesitation and bogging. Lotsa bogging after 50% throttle. Can't go past that nor do I want to but I don't have a CEL coming back after they were cleared.
Hope yours goes well.
I had oem ngk platinum injectors installed. A local mechanic did all the work and he had never worked on a S2000 before.
Do the oem NGK's need to be regapped upon installation? If so, I have no idea what they are gapped at currently but it semi fixed my problem. My car idles fine and revs fine. Big issue is when I put a load on the motor. Some slight hesitation and bogging. Lotsa bogging after 50% throttle. Can't go past that nor do I want to but I don't have a CEL coming back after they were cleared.
Hope yours goes well.