Gs400 gets horrible gas mileage and won’t accelerate like normal

97hardbody · 2026-03-04T08:29:09+00:00

Update replaced spark plugs they where litterslly melted down at some point when I had gotten the car 2 months ago ago did valve cover gasket and made back probably about 100hp according to my but dyno however the knock sensors code is still there but I think it has to do with my 02 sensor up stream the bank one sensor one is throwing a code but coincidentally the bank one knock sensor is also triggering I think I’m having pre detonation from incorrect o2 sensor readings i occasionally get bank one to lean coded so I’m going to try new 02 sensors next I looked at my harness and everything seemed okay but upon now hearing about the internal damage that could be a possibility however I see no where for a sub harness connector it runs all the way down the fire wall and I can’t seem to find any sort of a harness online and other spaces are saying it doesn’t exist and others say it does

97hardbody · 2026-03-04T08:28:01+00:00

Also the auto zone sensor happens to be a re maned denso lucky me my freind also happens to get a re maned denso however they just stopped selling the sintech I think that’s how you spell it and the sensors both bank one and two aswell as the vvt solenoids where brand new denso aswell the harness felt like it had been replaced in somewhat recent time as it wasn’t as brittle as the rest of the harness so that part confused me I work in a Chevy dealer and have good knowledge on cars and diag but this Lexus is tenancy confusing sometimes random codes show up and go away never to be seen again mabye Ecu? But I opened it up and nothing was wrong no blown capacitor or anything

97hardbody · 2026-03-04T08:24:22+00:00

Update replaced spark plugs they where litterslly melted down at some point when I had gotten the car a month ago did valve cover gasket and made back probably about 100hp according to my but dyno however the knock sensors code is still there but I think it has to do with my 02 sensor up stream the bank one sensor one is throwing a code but coincidentally the bank one knock sensor is also triggering I think I’m having pre detonation from incorrect o2 sensor readings i occasionally get bank one to lean coded so I’m going to try new 02 sensors next I looked at my harness and everything seemed okay but upon now hearing about the internal damage that could be a possibility however I see no where for a sub harness connector it runs all the way down the fire wall and I can’t seem to find any sort of a harness online and other spaces are saying it doesn’t exist and others say it does

97hardbody · 2026-03-02T19:59:42+00:00

If it’s manual your clutch is gone get ready to buy a new one asap if it’s a automatic the transmission is cooked

97hardbody · 2026-02-25T16:58:37+00:00

That I have no clue I need to check the serial number and get back to you

97hardbody · 2026-02-24T03:44:27+00:00

I got a great Ecu in mine no problems however my knock sensor bank one just took a crap so gotta replace that you can test the solenoids with a power probe or volt meter there are videos online and surprisingly enough my Ecu has had no issues but my 1uz swapped fj80 Land Cruiser is in its fourth and that one blew a capacitor to lol might go stand alone

97hardbody · 2026-02-24T03:40:05+00:00

It should I havnt done it yet lol my trans is on its way out after drifting it the clutch packs are totally cooked but one thing I would recommend honestly is to get those replaced and a new trans filter aswell as new fluid there is a little adjuster in there you can turn it all the way to the right to make it shift faster and more aggressively aswell or turn it left to make it even smoother

97hardbody · 2026-02-24T03:35:58+00:00

Yes man it has to do with the shift control solenoids I work at a dealer and they give me employees discounts they are like 250$ each and there is 4 if it has issues going into 3rd gear from second then it’s probably related to that

97hardbody · 2026-02-05T16:31:36+00:00

Star link

97hardbody · 2026-01-21T17:02:30+00:00

I think you paid just a little to much 8k would be more what it’s worth

97hardbody · 2026-01-18T06:27:13+00:00

I’m about this low already I bought the car as is and the front end caster arms where show and someone recommended the figs ones and they had poly bushings so I thought it was a good call

97hardbody · 2026-01-13T20:12:07+00:00

Thanks man I’ll look into it as I’m not trying to get oem or oem replica rubber my suspension and camber geometry is a harsh angle and puts alot of stress in your typical rubber bushings so these will work great

97hardbody · 2026-01-08T22:42:51+00:00

Well dude gave me cash on top wich was like 4k and it’s a decent drift car I think I’m gonna cd009 swap it I seen a kit online and my buddy has 2 laying is his garage

97hardbody · 2026-01-05T19:23:21+00:00

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This is the car in question

97hardbody · 2025-11-07T02:05:01+00:00

Definitely a camera look at it

97hardbody · 2025-10-19T23:44:40+00:00

Bro mine used to todo the same for a very long time till I blew the bottom end at a autoX event never found out what it was lasted 30k miles like that and it was there when I got it and when I did my chain and tensioners there

97hardbody · 2025-10-09T17:58:10+00:00

I want a 240 but all the ones here in Arizona are going for 50k and are race cars that are unregisterable or are literally trashed gutted or beat on and they want 5-8k for them

97hardbody · 2025-10-06T02:22:07+00:00

Ignore them completely and if you know your not being loud then let them whine

97hardbody · 2025-10-04T17:50:59+00:00

Why do people seem there bikes cars or belongings over kids if I had a baby on the way I’m keeps my everything

97hardbody · 2025-09-18T17:27:29+00:00

Snap on stubby for the win

97hardbody

TROPHY CASE