Should i worry {lean}
Thread Starter
Launching!
Joined: Aug 2002
Posts: 241
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From: flordia
Should i worry {lean} I have diablo ,and its hard to get a good reading.A guy here told me to look at the LTFt at 1400 curzing speed ,and they should be 0.00. There not,but at WOT the ST is o.oo
LT is o.oo sometimes 3.00 then 0
ST is o.oo
LT is 3-5 then 0.00
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
LT is o.oo sometimes 3.00 then 0
ST is o.oo
LT is 3-5 then 0.00
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
On The Tree
Joined: Dec 2002
Posts: 176
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From: Orlando, FL
Re: Should i worry {lean} LTrims do not indicate if your car is running lean or rich. They only indicate that the PCM must deliver more or less fuel than the stock calibration calls for. That may sound like I'm saying the same thing but I'm not.
The only accurate way to know if the car is richer or leaner than desired it to use a wideband O2 sensor. Unless you have the ability to change the PCM calibrations (ie. tuning) shooting for 0 is not necessarily a good thing. If you are at 3% the car needs more fuel than GM intended and it is doing its job. There are reasons for shooting for 0 or a negative value but that assumes you can change either the MAF tables or the IFR tables.
Tim
The only accurate way to know if the car is richer or leaner than desired it to use a wideband O2 sensor. Unless you have the ability to change the PCM calibrations (ie. tuning) shooting for 0 is not necessarily a good thing. If you are at 3% the car needs more fuel than GM intended and it is doing its job. There are reasons for shooting for 0 or a negative value but that assumes you can change either the MAF tables or the IFR tables.
Tim
On The Tree
Joined: Dec 2002
Posts: 176
Likes: 0
From: Orlando, FL
Re: Should i worry {lean} I've had two cars (very minor mods) on the dyno with predator tuning and both have exhibited very poor A/F ratio curves at WOT. They would start extremely lean and get very rich at the top end. I wouldn't worry too much. If you really want to verify just throw it up on the dyno for a pull or two.
Tim
Tim
