ok so i have a 04 s2k with 65k. I recently installed a 70RR j's and dynoed the car at 227whp car pulls fine no issues.

I change the plugs on the car about 3 weeks ago. Installed ngk's from advance auto that it calls for 7746 and install them no problems.

I drive about 40 miles and get a cel light cyl number 2 misfire. But cars runs complety normal, nothing abnormal so i erase it and drive another 250 miles and it just now came on again. Rechecked it and now its showing cyl number 2 and 4. So tonight i pull the plugs to see if something looked off and plugs look fine. Do a compression test and heres what i got. The tester was kinda beat up but it works and tried it 3 different times and got the same numbers

cyl 1 closest to rad - 280

next to it was 175 cyl 2

cyl 3 was 275

cyl 4 closest to firewall is 275


Numbers seem very high but cyl number 2 seems off. The car drives fine i havent got on it since i found out. Im going to put the stock plugs back in and take it to a shop

Any idea on the numbers or culprit?

Cracked retainer? valve going?

i just bought the car last month and the cel started as soon as i changed the plugs.

Any advice would be greatly appreciated

 

update. Put stock plugs back in. Car does sound alot smoother and exhaust note has change (better) not so notchy. Def noticed a difference but still worried about compression number. Im hoping it was just a bad tester. I find it hard to belive the car would make that kind of power with a bad cyl. It def seems like the plugs made it misfire and putting the original ones back in made a pretty noticble difference but mainly in exhaust not and throttle response. Cant be the rings becuase the car doesnt smoke at all. Retainers i heard on a ap2 are alot stronger so i kinda fell away from that. So im hoping putting the oem plugs back in and some fuel cleaner will fix everything. Light is still on so im hoping it will dissapear on its own once it see's the car is not misfiring anymore

 

what kind of ngk plugs were they?

 

How about you find out what code it is throwing?

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update. Started car this morning. CEL dissapeared own its own. Drove it about half a day and came back on. Plugs where 7742 ngk's i belive. I belive i got the iridiums and the car calls for the platniums. But i put everything back to stock and im still having a cel. I will go get the codes read again tommorrow