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jamesblacklexus

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  • Lexus Model
    sc 400

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  1. kind of a waste will make for bad gas it sounds cool but didnt notice much power increase. u would have to do more than that w such a big motor. these motors dont ahve hardly anything to make more powerful. better off 1900 for the 2jz motor. the 4.0 is garbage. if was a 4.7 32 valve new w supercharger that would be hot. but older 4.0 are not worth putting money into. do urself a favor keep ur money its garbage injen like only brand i found if u can cut hole in that area and route intake down there would maybe do more power since not so hot in that engine bay. but the intake not worth it
  2. Yes that was me, I am still having the same issues, I am expecting a new crank position sensor today, and i'm replacing the IAC valve as well, from a 90 LS400 that was wrecked last week. as soon as I get those replaced I will be checking the timing, the timing belt and water pump are 4 months old, so I hope I can get this done. If anybody has an more suggestions please don't hesitate. thanks new here hope this reply goes thru and can figure out how to navigate theu here. i had the same prob car start and for sec like it might die and then wont start sometimes. i looked at plugs cuz all electrical and fuel was eliminated. so only left ignition. looked at plugs . the sc400 is 32 valve and old valves can leak and everyone has abt same comlaint for abt same year mine is 93. i really think that the plugs are getting oil on them. its simple the plugs go in middle of head and very easy get oil from a partially leakin valve seal. not to smart when comes to cars btu mine would not start changed plugs saw oil on them and started right up then it wouldnt im considering doing valve job on her but think had to do w oil leakign in the head its like a hemi. where the plug in middle of head. and a older car makes since that will not spark w oil going on plugs like that. or start sometimes or start and smoke a lil when start. i dont want to do valve job so if anyone knows a way fix this wo doing valves but no one seems to be able have answer here
  3. so after i put th injen intake on the 93 sc 400 it started to smoke after putting th 5 w 30. it has 130k friend sd not good to have that oil go thicker. went w 20w 50. it only smokes when first start or hit the gas hard. i did a lil dogging it out. i figured the smoke was valves due to no loss power. i didnt mind a lil smoke everyonce in a while but couple days ago went to get stop smoke and check why when starts in mornign it cranks first time but not rpms take extra sec to go up like a slow start. motor cranks and then it starts to warm up in florida not cold but like a cold start. thought was electrical replaced altenator and batter . well when went to shop that day put stop smoke and check batter was fine but when went to check alt car wouldnt start for test. the car i might add was on angle nose pointed up . now i think it could be a valves leaking onto plugs prevent spark/ i replace plugs right there at parts store car cranked up smoke came out. drove home 5 minutes changed belt and went to crank it wouldnt crank. abt 4 hours later it did and has been starting but stil smoking. i saw on here the ignition replace i bought the cap and rotor and new wires. is there anythign else i need to do . also the plugs had oil on them. i suspect that the leaking of the valves could be causing the car not to start. want to see if anyone has had the white smoke when car starts. and then eventually not start and start mess w plugs find oil replace and then starts. should i do somethign simpple or is it serious and need to the valves seals or o rings?
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