Having problems with your 1991 Lexus LS 400 ?
Exhaut pipes turn red hot plus intake plate or butterfly plate stay open. wash engine,then problems started whole exhaust pipe turn cherry red.looked at intake trotoll plate or butterfly plate it stayed open all the time.is that correct open or close then open.
Your intake manifold should only open when you accelerate on the gas pedal you need to lube it.and the exhaust pipes probably turn red because there is not enough air to cool the engine check your fan relay switch and thermostat to make sure they are working. That may very well be the problem.
Repair Help & Product Troubleshooting for 1991 Lexus LS 400
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