Hershey

As the topic state, My cylinder one have miss fire. Sorry if i post this on the wrong place. Sorry for and spelling to, so bare with me. I bought the car in Aug of 2008, Its a 2000 s2000 with 97,000 mile. The owner told me that he just had the valve tighten from honda. The car had a CEL and he told me that it was a bad coilpack on cylinder one. when i had the car and took it to get the code check. the only thing that came up was (P0411 Secondary Air Injection System Incorrect Flow Detected) well i fixed that because the vacume line was hook up wrong. after that was fix, the car ran find for one day. and the CEL came back on. well i check again and it was three cylinder miss fire. so i put some new plug in there. Bosch planthem 4 spark plug, when i took the old one out. they were the same one. as the new one i just bought. well after the change. everything ran well until cylinder 1 was the only thing that miss fire again. so i put a new coilpack on cylinder one. still the same problem after it. so i put new spark plug again. i change over to ngk laser planthem plug and still testing if it would come back. Edit. forgot to said that the cylinder one had oil in it from the seal. but then i change the seal and the problem went away already; so no more leak.

Updated:
Did a compression test. Cyl1 was 182psi, cyl2 was 181psi, cyl3 was 168psi, cyl4 was 175psi.
The only code i am getting is cylinder one missfire and random missfire.
Cylinder 3 came out lower but then never had a missfire from that and clinder one have the highest psi and still is the one getting the missfire.
New Coil were put in
New spark plugs
The car was told by the old owner that it just had a valve adjustment.
just did a IAC valve clean.
Map whack also was done
last thing on my mind is new injector?
I have a weird problem with the car at idle. watch this video and tell me what could be wrong[media]v105gNl5-9I [/media]
if i rev it higher the 2000rpm the car would drop back down to normal idle. but is i press on the gas only pass like 1500rpm. the car rpm would drop really low. sometimes even dying. could anyone tell me what was wrong with this?

I have a innova code reader and if this help or anything let me know.
p0301 freeze frame data
fuel sys 1 CL
Fuel sys2 NA
Calc load (%) 32.94
ECT(oC) 51
stft b1 (%) -3.13
ltft b1 (%) -6.25
MAP (kpa) 33.00
Eng Rpm 1322
veh speed(km/h) 0
Iat (oC) 31
TPS (%) 5.49

sorry for my bad grammer and thanks in advance for all the help.

negcamber

Might help:

https://www.s2ki.com/forums/index.php?showtopic=659930

Hershey

Thanks. that was a great help. i will be doing a compression test and after that. if it dont work then pretty much i will have to try the injector.

Hershey

bump

The Gent

i have a simiar issues.. Just for reference...

https://www.s2ki.com/forums/index.php?showt...&#entry15847946

Hershey

thanks. getting my valve adjustment done tommorow. so lets just see what the result are after getting it done.

The Gent

Checked my idle yesterday after seing what you posted... If I rev to 2000 idle will drop down to ~900. If I rev to 1500 it will drop down to ~500 and backup to 900. It never stalls.

Since my last changes my cel didn't come back and it's been about 700 KM now. I'll just leave it as is for now since it's running good.

Have you checked your PCV valve? Also, is your aibox cover on?

Hershey

wow same problem then. well my air box cover is on. and guess what. i took it to humbleperformance a local shop in town and had them do a valve adjustment. whoever did it before i bought the car tighten it so hard out of spec that he had to loosen it back out. after that. car run find and idle good. but i dont know yet because i dont drive the car much. so i am crossing my finger that the cel would not come back on. but guess what i gain 9hp and 7tq from just my valve getting fix.

http://www.humbleperformance.com/forum/vie...d.php?tid=35132

copy that. its posted on there. i did a dyno it before the valve and after and there was a big different in my hp.

The Gent

Good, let's cross our fingers together (mine didn't come back too).

Cheers

Hershey

cheers

lets hope it dont come back too. i havent drove my after because if rainy day so i didnt feel like driving it. but we will see.