S2000 Under The Hood S2000 Technical and Mechanical discussions.

AP1 running rough, HELP

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Old 05-03-2012, 01:19 PM
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Thats whats next, I'm thinking it's a valvetrain problem.
Old 05-03-2012, 01:26 PM
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I've got the EXACT same problem as you. Getting my valves adjusted today. I'll report back.

BTW, nobody ever answered you on removing the hoses the easy way. A little WD40 helps, but he trick is use a pair of pliers to twist, or rotate, the hose on the fitting. Then they'll pull off fairly easily. Tell me how it works for ya.
Old 05-03-2012, 01:26 PM
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Valve adjustment and leakdown test. Check for cracked retainers while in there as well. There are plenty of walkthroughs on the forum for this. Good luck!
Old 05-03-2012, 02:01 PM
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thanks guys. will update ya asap
Old 05-03-2012, 07:21 PM
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Just had the valves adjusted.

PROBLEM SOLVED!
Old 05-04-2012, 06:14 AM
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will start there. thanks!
Old 05-04-2012, 07:55 AM
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Hey lap1, good news finally. at least someone's S2 is back to running tip-top, haha.

I read in another post as I was searching "no power, power loss". And billman suggests removing the 02 pre cat, tieing it off to prevent damage, then going for a drive. If the car runs better then that's evidence of a clogged car/exhaust system and if it makes no difference, you've ruled out one of the more likely causes. Just figured I'd mention that since it's a little easier than a valve job.
Old 05-04-2012, 08:27 AM
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MR. T thanks a bunch! will let you know how i fare with that. If cat is fine then ill move on to valvetrain. pricing things out as we speak.
Old 05-04-2012, 11:57 AM
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Have you done anything with the coils? Swap/etc? My car wasn't throwing any codes and it stumbled while idling and accelerating. I had about 100K miles at the time(last year). Replaced the coils and all is well since.

Definitely check the coils before doing more expensive replacing/repairs.
Old 05-04-2012, 12:20 PM
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Originally Posted by LAp1
MR. T thanks a bunch! will let you know how i fare with that. If cat is fine then ill move on to valvetrain. pricing things out as we speak.
Skip the cat, valve adjustment is easy. Not to mention two or three people have told ya that a valve adjustment fixed the exact same problem you are having. This is a requirement at your mileage anyway. It needs to be done, no matter if it fixes your problem or not. There are guides on here to do it.


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