S2000 Under The Hood S2000 Technical and Mechanical discussions.

Engine Misfire

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Old Nov 4, 2007 | 03:04 PM
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Default Engine Misfire

I got the dreaded blinking CEL. I scanned the ECU at autozone and it said I was misfiring in 1,2,3,4. I pulled the plugs and they looked fine...after that I did a compression test and got these results

#1(first one outwards)190 <-due to the first time I dropped a valve which was fixed
#2 250
#3 250
#4 250

Once everything was put back together I started her up and started to idle really low...after I drove it around for a while it ran fine but the cel still blinked so I parked it at my dads house and left it. What should I do now?

Info on the car

2001
69k
dropped a valve about 6000 miles ago, $4000 in damage(dealer covered)
new clutch 800 miles ago
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Old Nov 4, 2007 | 04:16 PM
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do you know the proper #'s for the compression test?
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Old Nov 4, 2007 | 04:27 PM
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No, I don't, but my guess it's suppose to be high since it's a high compression motor?? I'm used to working on DSMs so I'm not sure on the numbers if someone can enlighten me that would be great.
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Old Nov 4, 2007 | 04:34 PM
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250 is good. No more then a 10% difference in compression across the cylinders.
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Old Nov 4, 2007 | 04:42 PM
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than i guess his headgasket is good?? did you check the spark plugs??
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Old Nov 4, 2007 | 05:52 PM
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Spark plugs are fine, a little tanish on top.


I whacked the map sensor and zipped it, same problem occurs. Fuel injectors? Should I just pull the valve cover to check the retainers? I just started thinking when I did my clutch change I had the motor tilting against the firewall a little if I remember correctly the two sensors on the valve cover were touching the firewall maybe I destroyed one of them?


ALSO!! last night I topped my gas tank to the max, maybe a little over, could this of caused something?

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Old Nov 4, 2007 | 05:55 PM
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could be fuel injectors, coil pack issue, ecu issue...etc.
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Old Nov 4, 2007 | 06:17 PM
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check for spark. take one of the plugs out and ground it somewhere in the engine and crank it. see if you have a good spark across the electrode.

did it just start happening or have you noticed a decrease in performance?
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Old Nov 4, 2007 | 06:22 PM
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performance has stayed the same as far as I know, it's been smoking(white blue oil) a tiny bit when I come to a stop sometimes though I didn't think much of it I just guessed thats where my quart of oil I put in every 2k goes heh
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Old Nov 4, 2007 | 06:27 PM
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Originally Posted by thatsahonda,Nov 4 2007, 07:22 PM
performance has stayed the same as far as I know, it's been smoking(white blue oil) a tiny bit when I come to a stop sometimes though I didn't think much of it I just guessed thats where my quart of oil I put in every 2k goes heh
wow you put 1 quart of oil every 2k miles??? anybody - is this normal for an s2k?

sorry i have owned my car for 2 weeks and did all the fluids a week ago, so i'm not sure how much oil it uses between changes... but man that seems kinda high for a honda engine(i've owned many hondas and was an acura tech for 2.5 years)

can you do the quick ignition check and come back with the results?
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