1993 Lexus Ls 400 "vacuum cleaner motor surging" Questions

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...vacuum or suction leaks you may have along your air intake system, while you're at it buy some MAF cleaner and give that MAF a spray. ecu.bad caps in ecu was my problem, same as the problem you have ...

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...your vacuum hoses also.To check for vacuum leaks on hoses, etc:, while the motor is running, spray "non-flammable" brake cleaner on hoses, if rough engine idle perks up, you have found your

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...vacuum hoses and see if your motor surges or starts to die. Last resort is using carb cleaner spray. Sparringly, spray quick, short bursts in and around vaccum lines. Never spray alot at once and not ...

...cleaner tube or throttle area is a sensor with a pigtail of wiring going to it. It comes off the throttle connections. If it is surging unplug it and it should stop surging. Then you know it was bad ...

...vacuum hoses connection and electrical conection.I'n most cases,the diaphragm could be dirty,thus restrictin internal part to slide back and forward.If you are handy,locate the ISV and remove it.Use ...

Question about Lexus LS 400

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...vacuum leak then the iac on the side of the throttle body will need to be removed and cleaned. The best thing to do is remove the whole throttle body so it can be cleaned as well - both with carb ...

...cleaner above the engine around the intake and vacuum line and see if the engine reacts to it. If does you have a vacuum leak which may cause you to surge aswell. You may also want to change your iac ...

Question about Lexus LS 400

1 Answer

delivery. . for vacuum leaks spray some carb cleaner around the air lines any change in the engine usually indicates an air leak. also the fuel pressure valve these can all lower or stop fuel pressure

vacuum line off the pressure raises to 43 psi and stays there until I put the line back on then hovers at 36-38 psi then surges and the motor shakes due to the rough idle. Any thoughts?! Thanks Again!

...vacuum leaks. The original Motorcraft carbs have a stud for the air cleaner and it must be installed. Check all the screws. If the idle mixture screws have no effect it is time for a rebuild. I ...

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