Overfueling! Id Say!

[andyrh78]

Right, had a mechanic come over yesterday to take a look a my ever growing list of problems.

First, he identified the tons of smoke on cold start up to be fuel. He suggested I put some injector cleaner in with some fuel and try to clear the injectors as they might be blocked. This was the first time Id driven it since these problems arose. Put £20 of super unleaded in with the inj cleaner. It made no difference however I did manage a fantastic 6 miles until I was out of fuel again!! So, any ideas on what can be causing the car to overfuel so badly losing all the fuel out of the exhaust on start up in smoke.

[Bazza]

wouldnt have thought it would be blocked injectors if its overfueling !!

air sensor, maybe

[Haylands]

Right, had a mechanic come over yesterday to take a look a my ever growing list of problems.

First, he identified the tons of smoke on cold start up to be fuel. He suggested I put some injector cleaner in with some fuel and try to clear the injectors as they might be blocked. This was the first time Id driven it since these problems arose. Put £20 of super unleaded in with the inj cleaner. It made no difference however I did manage a fantastic 6 miles until I was out of fuel again!! So, any ideas on what can be causing the car to overfuel so badly losing all the fuel out of the exhaust on start up in smoke.

Hi

Firstly I think I'd find a mechanic who knows what he is talking about.... as Bazza says if its over fuelling it isn't blocked injectors, suggesting you use injector cleaner was a positively ridiculous thing to say, if you have done 6 miles to £20 worth of petrol you will have washed the bores. Normally the cylinder bores in the engine will have a thin film of oil on them to help the piston up and down, wash this off with excessive fuel and injector cleaner means you will have dry bores. The next time the piston goes up and down it will scratch the bores as you have a metal to metal contact. Six miles at say 30mph takes 12 minutes at 2000rpm is 24000 engine revolutions with no oil. Probably the equivalent wear as a few years of normal driving. DON'T DRIVE IT ANY MORE. Get it checked by a proper mechanic, as Bazza says it will probably be the air flow meter or throttle body.

Good Luck

Pete

[zaph]

Right, had a mechanic come over yesterday to take a look a my ever growing list of problems.

First, he identified the tons of smoke on cold start up to be fuel. He suggested I put some injector cleaner in with some fuel and try to clear the injectors as they might be blocked. This was the first time Id driven it since these problems arose. Put £20 of super unleaded in with the inj cleaner. It made no difference however I did manage a fantastic 6 miles until I was out of fuel again!! So, any ideas on what can be causing the car to overfuel so badly losing all the fuel out of the exhaust on start up in smoke.

Hi

Firstly I think I'd find a mechanic who knows what he is talking about.... as Bazza says if its over fuelling it isn't blocked injectors, suggesting you use injector cleaner was a positively ridiculous thing to say, if you have done 6 miles to £20 worth of petrol you will have washed the bores. Normally the cylinder bores in the engine will have a thin film of oil on them to help the piston up and down, wash this off with excessive fuel and injector cleaner means you will have dry bores. The next time the piston goes up and down it will scratch the bores as you have a metal to metal contact. Six miles at say 30mph takes 12 minutes at 2000rpm is 24000 engine revolutions with no oil. Probably the equivalent wear as a few years of normal driving. DON'T DRIVE IT ANY MORE. Get it checked by a proper mechanic, as Bazza says it will probably be the air flow meter or throttle body.

Good Luck

Pete

In a few years time £20 for 6 miles will seem like a good deal, if OPEC gets its way. Is there such a thing as a faulty lambda sensor in a Lexus? Or holed vacuum cablesApologies if there is. I more used to Saabs, and have much to learn, but this is where I would be looking first with one of they.

[steve2006]

What year is your LS?

[cleverdick]

I am very sorry to hear about the problems you are having. I don't need to tell you that this sort of thing is not typical of an LS400.

You need to get a diagnostic code check done by Lexus or a bona fide independent Toyota/Lexus specialist (not just one that claims to be). I can recommend one in Rayleigh, Essex if that's any use - although probably not if you're in Kent. If you can get it towed there so much the better. Apart from the potential for accelerated engine wear, it can't be doing the catalytic convertors much good.

I would not like to speculate as to the cause because it could be so many things. An scan of the ECU should avoid a lot of guesswork.