Question about 1991 Lexus LS 400

# Every time the outside temp. surpasses above 90 degrees F, my car stalls, why?

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• Lexus Master

This might be air intake temp sensor or vapor lock.

Posted on May 14, 2014

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It is likely your AC pump is going out and draining the power on your engine. If you disconnect the wireclip going to the pump it will keep the AC clutch from engaging. Be sure to tie the wires out of the way so they don't get caught in the belt. Doing this will mean that you have no air conditioning but the engine should stop stalling until you can get a replacement pump.

Doing this may not solve your engine problem but it an easy enough thing to check and rule out.

Posted on May 14, 2014

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Posted on Jan 02, 2017

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Given your high guage temps of 210 degrees and high ambient temperature of 100 degrees, your engine's stalling can very likely be linked to either one of these three causes: 1) vapor lock; 2) percolation; or 3) PCV malfunction. Here's a really good diagnostic article that precisely addresses this issue of yours:
http://yourhandymanzone.com/Your_Handyman_Zone_How_To_Pages_Vehicle_Car_Zone_Cars_Trucks_Vans_Engine_System_Engine_Stalls_When_Hot.htm

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