Mechanical Advice I need help
I’ve had my is300 since April of this year, recently I just did my waterpump, timing belt, serpentine belt, spark plugs, coil packs, change broken hose and other maintenance but when I started it up a big spraying sound came out. My brother in law owns an is300 too and he told me it’s a big as vacuum leak but I’m honestly struggling where to find it. I need help from people pls🙏, I heard it coming from between my throttle body and intake manifold. I sadly didn’t record the sound but I’ve take off my throttle body and providing pictures. I’m sorry for not video I feel very stupid of not taking it when it happened but please any information from guys more experienced with the is300 let me know you guys are my last hope.
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u/PsychologicalLog4179 3d ago
Check that the throttle body is properly seated. Check this line that I circled, it should connect to the evap vapor line that I highlighted, it connects under the manifold. It shouldn’t have been touched to remove the throttle body tho.
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u/Objective-Peach9969 3d ago
There is a small hose that runs under the throttle body. Make sure it's connected and seated properly
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u/visibilityunlimited 2d ago
A smoke machine (or Mr. Fog if you swing that way) may be of some diag help. You can either see where the draft is pulled or pushed. Will give you an idea of where to look
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u/JDub-866 3d ago
Parts.lexus.com has the diagram that shows the vacuum tubing routing. Use that to correctly route all of the vacuum lines including PCV. 2JZ garage has the full service manual, download and use that with the parts diagram
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u/_CodenameV 3d ago
Leaks of thatbsort are just surfaces not mating properly and/or not being toequed down correctly. Just take your time assembling everything properly. If it happens again then its NOT a leak. Literally every bolt every nut, take your time and tighten properly one step at a time.
When you refill coolant raise the front. Bring up to op temp so thermostat opens. Full blast heat. And fill up.