the same with my car, my engine started hesitating when i turn on the AC or whenver i shift to neutral in the stop, i cleaned my intake,iacv,even re-oil the motor,new sprk plugs,seafoam intake and gastank and new coilpacks,i hope someone have solution for this

 

Well like I said in my previous post, I have a 2006 Mazda 3 that was doing the same thing but even without the air condition off. The car lent up having 2 cracked motor mounts and spark plug issues. I am going to take my S2000 into my mechanic on Monday (seeing as its Friday and I won't be back at the house with the s2k until later). I'm guessing its the same thing.


the same with my car, my engine started hesitating when i turn on the AC or whenver i shift to neutral in the stop, i cleaned my intake,iacv,even re-oil the motor,new sprk plugs,seafoam intake and gastank and new coilpacks,i hope someone have solution for this
[/quote]

 

I can't seem to upload my video to youtube... Ugh!

 

it helps if it shoots a code, so you can have an idea.. sort of sounds like a throttle positioning switch... idk.. glad your taking it to your tech...

 

IAC VALVE NEEDS CLEANING AND NEW PLUGS, MAKE SURE U DISC THE BATTERY AND HAVE THE CAR 4E LEARN THE IDLE

 

I know this issue very well. i have been dealing with this shake since 2010 -_-. here is the list of things i have found out that does this .

-Alternator ( the diodes) if your inside lights are not flickering then your fine.
- loose battery or bad battery
-dirty air filter - specialy cold air intakes, the fitler is proned to road debree.
- in need of a valve adjustment .

 

Not a bad idea to clean your throttle plate, doing this raise my rpms by 100

 

Hey guys, thank you for all the feedback.

I took it in to my mechanic finally. After a couple of hours at the shop, he ran a compression check and my first two cylinders have low compression. The first two cylinders are running at 75% compression. Apparently the normal compression is about 220 lbs per cylinder, and my first two were running at around 175 lbs each. He then put pressure into the cylinders to find out where the pressure was leaking and found out that the exhaust valves were leaking the pressure. The valves were already pretty tight but he managed to tighten them a little more. The compression maybe gained 5%.

My warranty just ran out and I am attempting to have my uncle call Honda USA to see if they will cover some or all of the car. The car was well maintained by my father and I for the last 4 or so years. It was regularly taken in and I have all the paper work to show that. If this does not work, and Honda decides to not cover any of the problems, I do not plan on putting the same valves back in and will be upgrading and modifying the car.

I don't know anything about good modification parts / companies for S2000's and although this is a rough idle thread, if anyone has anything in mind that would be greatly appreciated.

When I find out what Honda is going to do, I will be back for more help if necessary!

Once again, I appreciate all the help that I have received. I am not very knowledgeable on motors except the basics on how they work.

- Matt G.

 

Glad you found the problem. It's always worth ito push the issue, but I doubt Honda will do anything since you are about 1 yr and 16,000mi out of your warranty. But, good luck.

 

The car was bought in 2007 and the power-train warranty is 65,000 miles according to my owner's manual. Depending on when the first owner bought it, it could have not even been past the warranty.

We will see though.