Ls 400 Won't Rev Beyone 4000

[MUDGUTS]

Hi,

Looking for some advice with a 1997 LS400.

Everything works as it should, no warning lights, no problems below 4000 RPM.

If you floor the throttle whilst either in N or D the car won't rev beyond 4000. The emissions have been checked and are perfect.

Also the recovery guy was certain it was the left CAT.

I'm looking for ideas.

Thanks in advance.

[royzels]

Hi,

Looking for some advice with a 1997 LS400.

Everything works as it should, no warning lights, no problems below 4000 RPM.

If you floor the throttle whilst either in N or D the car won't rev beyond 4000. The emissions have been checked and are perfect.

Also the recovery guy was certain it was the left CAT.

I'm looking for ideas.

Thanks in advance.

Hello. I have a 1995 ls400 and mine was the same...After numerous enquiries I was told that they have some form of rev limiter on them, so they cant be over reved...Try it whilst under driving conditions, I think you will find its ok and will rev far beyond the 4000..Anyway mine ok now so its worth a try.....Hope it works for you ...Cheers Roy.

[MUDGUTS]

Hi,

Looking for some advice with a 1997 LS400.

Everything works as it should, no warning lights, no problems below 4000 RPM.

If you floor the throttle whilst either in N or D the car won't rev beyond 4000. The emissions have been checked and are perfect.

Also the recovery guy was certain it was the left CAT.

I'm looking for ideas.

Thanks in advance.

Hello. I have a 1995 ls400 and mine was the same...After numerous enquiries I was told that they have some form of rev limiter on them, so they cant be over reved...Try it whilst under driving conditions, I think you will find its ok and will rev far beyond the 4000..Anyway mine ok now so its worth a try.....Hope it works for you ...Cheers Roy.

Thanks Roy, it will drift up to a reasonable speed but there is no way its performance is normal: When you floor the throttle, the GB shifts down and the car won't accelerate, it won't go past 4000 RPM, if you lift off it will change up and the slowly accelerate. Weird...

[bazgtr]

Hi,

Looking for some advice with a 1997 LS400.

Everything works as it should, no warning lights, no problems below 4000 RPM.

If you floor the throttle whilst either in N or D the car won't rev beyond 4000. The emissions have been checked and are perfect.

Also the recovery guy was certain it was the left CAT.

I'm looking for ideas.

Thanks in advance.

Hello. I have a 1995 ls400 and mine was the same...After numerous enquiries I was told that they have some form of rev limiter on them, so they cant be over reved...Try it whilst under driving conditions, I think you will find its ok and will rev far beyond the 4000..Anyway mine ok now so its worth a try.....Hope it works for you ...Cheers Roy.

Thanks Roy, it will drift up to a reasonable speed but there is no way its performance is normal: When you floor the throttle, the GB shifts down and the car won't accelerate, it won't go past 4000 RPM, if you lift off it will change up and the slowly accelerate. Weird...

Just seen this thread.

Mass airflow meter.

It's not letting enough air into the engine when under load(Throttle to the floor) and staving the car of the right air ratio to burn the fuel and give you power and flooding the engine and bogging it down.

Not sure on the 1997 model but it maybe the same mass aifflow as a supra, Know of anybody local you could try swap to see if it works.

It could also be in limp home mode as it has a problem. Just plug into it at a local garage(around £30) or you can buy the plug in unit off an eBay seller for around £180, There's one based in Swansea off eBay that does them.

Baz.