bflinker9 Posted May 27, 2003 Share Posted May 27, 2003 What does it mean when my car is running to lean? The dealer says i'm at 45% at full throttle and I should be at 5% could someone explain and could you tell me how to fix it? THANKS in advance! Quote Link to comment Share on other sites More sharing options...
gslx4s Posted May 27, 2003 Share Posted May 27, 2003 What does it mean when my car is running to lean? The dealer says i'm at 45% at full throttle and I should be at 5% could someone explain and could you tell me how to fix it?THANKS in advance! When a car is running lean that is when your fuel is running out. On the other hand when a car is running rish, this is when a vehicles motor is getting to much fuel. That is the short term. There is a more technical term if needed.. Quote Link to comment Share on other sites More sharing options...
Rodders Posted May 28, 2003 Share Posted May 28, 2003 What does it mean when my car is running to lean? The dealer says i'm at 45% at full throttle and I should be at 5% could someone explain and could you tell me how to fix it?THANKS in advance! Hiya I responded to your question in the Euro forum Quote Link to comment Share on other sites More sharing options...
MrSypher Posted May 28, 2003 Share Posted May 28, 2003 What the dealer is saying to you is that your engine is getting too much air and therefore the mixture isn't right.. Now if you had and upgraded ECU that you could tune, then you could richen the mixture... But I guess Lexus Srevice will have to find what's causing the problem... Quote Link to comment Share on other sites More sharing options...
AWJ Posted May 28, 2003 Share Posted May 28, 2003 Your delear is telling you that you are not getting enough fuel. Clean your system - change fuel filter, clean injectors, troubleshoot fuel pump. Quote Link to comment Share on other sites More sharing options...
SKperformance Posted May 28, 2003 Share Posted May 28, 2003 sorry i am a little lost when they say you are at 45% and not 5 what are they refering to running lean is not the best depending on the situation i run real lean at idle and real rich at wot when i dynoed my car i had an air fuel reading also all engines run on the 14.4 rule it works for many automotive measures like 14.4 vdc for electric power when the car is running ( even though it is rated a 12vdc system) 14.4 parts of air to 1 part fuel is the "perfect" mixture for a so called perfect burn soi am at a lose on what they are trying to say fully all depends on the variables try and be descriptive as posible like was there a reason the car went in for service? Quote Link to comment Share on other sites More sharing options...
bflinker9 Posted May 28, 2003 Author Share Posted May 28, 2003 Thanks everyone for all the help! The reason I went to the dealer is because the check engine light went on and they said it was a bad air sensor. That is when they told me my car was running lean at wot. They said I had to take my K&N intake off before they would work on it so now i'm going to take it back in tomorrow to get it fixed and i'll find out more, I'll let you know what they said because it sounds like you know more than they do. Thanks again for your help! Quote Link to comment Share on other sites More sharing options...
SKperformance Posted May 29, 2003 Share Posted May 29, 2003 ahh a little more sense now how long was the inake in the car for is it a drop in filter or a cone cold air one or a short pipe? the car will usually run lean if the computer doesn't realise the change as it is getting more air and now can compensate more fuel did you uplug the computer to reset the ecu after the filter change? if it is a short piep( one that has a filter in the engine bay) take it out and leave it out they are junk it will run even more lean as it will get more hot air ,which equals less oxygen molecules for a slower burn which equals lower performance and gas milage Quote Link to comment Share on other sites More sharing options...
bflinker9 Posted July 2, 2003 Author Share Posted July 2, 2003 Yes, It is a cone K&N in the engine bay. I just bought the car in april so what intake would you suggest. THNX! <_< Quote Link to comment Share on other sites More sharing options...
SKperformance Posted July 3, 2003 Share Posted July 3, 2003 sorry i am not up to date with is performance specs but any intake that is located with a dr in the engine bay is not good get one with a pipe that goes to the bumper Quote Link to comment Share on other sites More sharing options...
bflinker9 Posted July 3, 2003 Author Share Posted July 3, 2003 THNX! Will Do. Quote Link to comment Share on other sites More sharing options...
JPI Posted July 7, 2003 Share Posted July 7, 2003 Your mass air flow sensor is bad. It couldn't measure the amount of air coming in your engine. That is why it is leaning out. Replacing the MAF sensor will fix your problem. Is your car under warr? Also the fuel trim is measure in short and long term. Good luck. JPI Quote Link to comment Share on other sites More sharing options...
boosted_IS Posted July 15, 2003 Share Posted July 15, 2003 nope mass air flow is fine. Air moving past mass air flow sensor to fast. The 2jz's run lean stock anyways. This is run by a butterfly vlave in the intake manifold. Slow the air down. 3 inch intake that is longer than 30 inches. here is the link to teck site for this issue. http://www.mkiv.com/specifications/ncf/ncf...cf93/ncf067.jpg Good luck Derek Quote Link to comment Share on other sites More sharing options...
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