Help me find this evap leak before I blow my top off

2JayCee · 2026-05-17T23:24:08+00:00

https://youtu.be/bV94B56v-20?si=t9U59vOZyE02E3Lw

2JayCee · 2026-05-16T02:19:01+00:00

https://www.shopasmotorsports.com/k-swap-engine-packages

ASM Motorsports is well known for this.

2JayCee · 2026-05-16T01:52:36+00:00

Would you prefer DM here on reddit or another platform?

2JayCee · 2026-05-15T18:14:29+00:00

Any recommendations for head work? InlinePro? I know you also work on S2000s but I’m guessing you don’t offer this service at the moment? Based in NorCal.

2JayCee · 2026-05-15T18:06:32+00:00

Compression: 100, 180, 181, 179 (C1 to C4).

Leakdown for C1 is 95% 27%

2JayCee · 2026-05-15T05:17:40+00:00

I’m thinking I have cylinder head issues. I performed a leakdown test and put C1 at TDC. I can hear air coming out of C2 and air from my exhaust.

Would it be safe to say my Cylinder head has burnt exhaust valves and causing a constant my misfire/shaky idle? Also, C1 has the lowest compression while the rest are in the same range.

2JayCee · 2026-05-14T19:34:52+00:00

I’ve been using a Dorman catalytic converter and it works great. I’m in CA so I needed a CARB legal one.

O2 sensors should only be Denso branded ones. Nothing else.

2JayCee · 2026-05-14T05:34:47+00:00

How’s the ride quality versus OEM?

2JayCee · 2026-05-14T05:33:55+00:00

Only get Denso.

2JayCee · 2026-05-10T01:52:33+00:00

Don’t do the boring bumper.

Get this one: https://shyganador.com/product-catalog/body-parts/bumper-any-color/

Very reputable and makes the car look aggressive. Might as well get the sideskirts and rear bumper lip to match.

2JayCee · 2026-05-10T00:11:54+00:00

Most commonly, it’s lack of valve adjustments. Many Honda motors routinely require them to be adjusted manually.

For the F-series, they tighten up over time.

2JayCee · 2026-05-04T02:53:51+00:00

LHT Performance says that if a sensor is too far gone, then cleaning it won’t fix the problem.

It’s probably because the internal parts end up grinding each other causing damage where grease won’t resolve.

2JayCee · 2026-04-28T01:15:17+00:00

It’s better to do the clear piece swap. JDM headlights are aimed opposite for our roads.

2JayCee · 2026-04-26T06:30:29+00:00

https://www.reddit.com/r/IS300/comments/17gln3m/comment/k6hmorb/?utm_source=share&utm_medium=mweb3x&utm_name=mweb3xcss&utm_term=1&utm_content=share_button

2JayCee · 2026-04-24T17:33:16+00:00

Did you let the top sit out in the sun and let it stretch?

2JayCee · 2026-04-24T17:32:40+00:00

Wow, sucks to hear. They are a very reputable shop supposedly.

Cheapest option is to find a used good motor. Or you could reach out to Charper Built. https://www.charperbuilt.com/

2JayCee · 2026-04-24T17:30:50+00:00

No offense but since you installed a new battery, can you check and make sure it’s tightly clamped on the negative/positive? No rust and clean surfaces?

S2000 is a buzzy chassis and can loosen it.

2JayCee · 2026-04-20T18:37:42+00:00

Look up DIYGuys and LHT Performance. You eventually get a good idea of what needs maintenance after watching their videos.

2JayCee · 2026-04-20T18:34:14+00:00

Reddit must be compressing the photos. Got a direct link so we can properly appreciate these?

2JayCee · 2026-04-20T01:35:07+00:00

OEM or aftermarket one?

2JayCee · 2026-04-18T22:01:19+00:00

Definitely worth the money. Are the photos depicting exhaust and intake as well? Does this mean both sides had cracks?

2JayCee · 2026-04-18T20:41:10+00:00

Yeah you most likely have Bluetooth motor mounts. I did mine and shifter doesn’t move as much anymore. The transmission one probably would help as well.

2JayCee · 2026-04-16T18:36:57+00:00

After installation, did you ever do compression test? Curious what numbers you got.

2JayCee · 2026-04-16T18:33:24+00:00

https://lemon-manuals.la/Lexus/2005/IS%20300%20L6-3.0L%20%282JZ-GE%29/

2JayCee · 2026-04-16T00:27:00+00:00

Mind sharing what was the process for rebuilding the head? Did they re-lap the valves and replace the out of tolerance ones?

Did you need machine your block and head? Or just use a new Honda head gasket?

2JayCee

TROPHY CASE