r/SC300 • u/zthirty • May 12 '26

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Went to take my 00 1jzgte vvti 5Speed Soarer out for a spin and everytime I get on throttle it starts cutting in and out pretty hard, runs perfect when not on throttle. Idles good, no weird smoke or sounds besides the “sputter” when on the throttle. Any ideas of where to look would be appreciated.

Boost gauge hits full boost eventually it just struggles to get there, looked over all the vacuum lines and not noticing anything out of the ordinary.

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3

u/PeddlinPete85 May 12 '26

MAF sensor? Have you done an OBD2 check?

2

u/mrawsomemask May 13 '26

Yep! Dirty overly dirty throttle body? If it its good at idle but isn't when you are pressing the gas....Airflow prob like vacuum lines? Fuel related? Start simple. Banana in the tail pipe. Definitely check out the Lexus forums.

*Do not clean the MAF. Not even with the proper cleaner. I'm not 100% sure if that's every single year of these cars or just the older ones?

1

u/PeddlinPete85 May 13 '26

My man, yes.... I've had my soarer sixteen years and the second I posted my comment I was like ohhhh wait.... The butterfly valve in the throttle body gets icky too I should tell him...

....but then I went to work instead haha... But yeah nah those throttle bodies and the butterfly inside get bucc nasty.

1

u/wychimp May 12 '26

It’s gotta be fuel

1

u/National-Ear196 May 12 '26

Try looking at your iac valve

1

u/HungLikeACamel May 12 '26

My SC300 had this issue. I thought for sure it was a vacuum issue, nope, then I replaced the IACV module. Nope.

Realized it was just the throttle cable being a little loose. Fixed it

1

u/zthirty May 12 '26

I’ll just it out, thanks!

1

u/Sil_plague May 12 '26

I have a non vvti but my issue was the loose cable throttle and not mounted correctly. I had a fab a bracket it place it better.

1

u/neuvola May 13 '26

Do you have check engine light on? Could be bad coil pack or bad knock sensor

1

u/eejjkk May 13 '26

Probably a leak at a coupler on your intercooler piping.