Air Conditioning Problem.

[lexuslover]

I think my Lexus Ls 400 - 1994 is a fantastic car, however i have a serious problem.

When i apply the air conditioining, it lasts for about five minutes and when i stop the car at a junction of traffic lights , the revs drop so low that when i proceed to take off again the car cuts out and i have to re-start again.

This is very annoying and it stops me using the air con.

I have had it with the mechanic several times but to no avail.

Can anyone please help me.Desparate.

Thanks

[adz]

I think there's a sensor which raises the revs when the A/C is turned on, obviously the A/C compressor needs a lot of power so the revs have to compensate. I'm not sure exactly how this is done on the LS though. Have u tried a search on the US forums as they probably use the A/C much more than us lot.Mine actually raises the revs so you actually hear it go up when the A/Ccompressor kicks in. (i've just been out to check)

I have a 94 LS too mate and you're spot on , it's a great car. I took mine for the MOT today after 8 months ownership and 12500 miles and it passed straight away.

Good luck with your car mate.

[lexuslover]

I think there's a sensor which raises the revs when the A/C is turned on, obviously the A/C compressor needs a lot of power so the revs have to compensate. I'm not sure exactly how this is done on the LS though. Have u tried a search on the US forums as they probably use the A/C much more than us lot.Mine actually raises the revs so you actually hear it go up when the A/Ccompressor kicks in. (i've just been out to check)

I have a 94 LS too mate and you're spot on , it's a great car. I took mine for the MOT today after 8 months ownership and 12500 miles and it passed straight away.

Good luck with your car mate.

←

[lexuslover]

I think there's a sensor which raises the revs when the A/C is turned on, obviously the A/C compressor needs a lot of power so the revs have to compensate. I'm not sure exactly how this is done on the LS though. Have u tried a search on the US forums as they probably use the A/C much more than us lot.Mine actually raises the revs so you actually hear it go up when the A/Ccompressor kicks in. (i've just been out to check)

I have a 94 LS too mate and you're spot on , it's a great car. I took mine for the MOT today after 8 months ownership and 12500 miles and it passed straight away.

Good luck with your car mate.

←

Cheers Adz.

My refs rise to compensate also but every minute or so they drop back down and go up and down for a while and then down so low the car cuts out.

Thanks for help.

[recalcitrant]

Mine did the same, would conk out after engine been running a while. Could sit at lights and watch engine revs drop until the car stalled, took car in and problem was dirty throttle!

[eXOBeX]

Mine did the same, would conk out after engine been running a while. Could sit at lights and watch engine revs drop until the car stalled, took car in and problem was dirty throttle!

←

Easily DIY cleaned or a garage job?

[recalcitrant]

Mine did the same, would conk out after engine been running a while. Could sit at lights and watch engine revs drop until the car stalled, took car in and problem was dirty throttle!

←

Easily DIY cleaned or a garage job?

←

Garage I'm afraid and they pulled my pants down at £165.00

[magical_waters]

I just had this issue the other day. I was coming home from an amusement park, and had turned the A/C on on the free way for about 10-20 minutes of driving. I hit a traffic jam, going about 10-15 miles per hour, turned off the a/c to enjoy the hot weather outside. and then all of a suddend when I went to accelerate the car had shut off! I was scrambling to get to the side of the freeway emergency lanes. This had happened once more with me before. Usually the A/C is never turned off when my family drives it. So does cleaning the throttle solve the problem completely?

[cardona6569]

I just had this issue the other day. I was coming home from an amusement park, and had turned the A/C on on the free way for about 10-20 minutes of driving. I hit a traffic jam, going about 10-15 miles per hour, turned off the a/c to enjoy the hot weather outside. and then all of a suddend when I went to accelerate the car had shut off! I was scrambling to get to the side of the freeway emergency lanes. This had happened once more with me before. Usually the A/C is never turned off when my family drives it. So does cleaning the throttle solve the problem completely?

←

Hello: More than likely cleaning the Throttle will solve the problem. Also put fuel injection cleaner. The problem will solve when you run the car a bit hard for a day. A bit hard is stteping down on the gas so it gets more flow of gas going. It should take about a day or two and your problem should be gone. Need to check air filter also. If all these fails I would replace fuel filter. You can also clean the Mass/airflow sensor as last resorts. You can do it yourself cleaning the Throttle.

C. PR