car running very lean??
car running very lean?? I have a 99 trans am ls1, headers, exhaust, ported throttle body and fost mail order tune.
I have recently installed a racetronix fuel pump and wideband o2/gauge in my car. I feel like my a/f ratio moves around A LOT
On initial startup, my a/f ratio moves around from like 13.5-15 once it idles down or drops around 14.2-15.
Light cruising it bounces all over from high 12's to 16 and if I hit WOT its all over the place, usually bounces around from 12's to mid17's then goes full lean and displays "---"!!
At first I had a fueling issue, but I believe that is fixed. I have pressure tested the fuel at the rail and I'm getting 58-61 psi as idle, also hady buddy read the gauge while I break torqued it to about 3000rpm and it sat at a solid 60psi the whole time.
Also had a small exhaust leak at my collector before sensor and fixed that(the a/f was reading pretty lean at idle before that was fixed)
Is my car really running this lean!?!? Or is there an issue with the gauge??
Please help me with any ideas of what's going on here! I'm not driving the car anymore since there's a chance its really this lean.
From the few times I have driven it, it idles smooth, as it always has and feels just as powerful as it always has, no sputtering, no surging, can't here pinging...
Thanks
I have recently installed a racetronix fuel pump and wideband o2/gauge in my car. I feel like my a/f ratio moves around A LOT
On initial startup, my a/f ratio moves around from like 13.5-15 once it idles down or drops around 14.2-15.
Light cruising it bounces all over from high 12's to 16 and if I hit WOT its all over the place, usually bounces around from 12's to mid17's then goes full lean and displays "---"!!
At first I had a fueling issue, but I believe that is fixed. I have pressure tested the fuel at the rail and I'm getting 58-61 psi as idle, also hady buddy read the gauge while I break torqued it to about 3000rpm and it sat at a solid 60psi the whole time.
Also had a small exhaust leak at my collector before sensor and fixed that(the a/f was reading pretty lean at idle before that was fixed)
Is my car really running this lean!?!? Or is there an issue with the gauge??
Please help me with any ideas of what's going on here! I'm not driving the car anymore since there's a chance its really this lean.
From the few times I have driven it, it idles smooth, as it always has and feels just as powerful as it always has, no sputtering, no surging, can't here pinging...
Thanks
I have my wideband on the drivers side after the collector/stock o2 and before the hi flow cat. They are edlebrock longtubes so its about 26" from the exhaust port on the cylinder head...not home at moment but I can get exact distance later tonight if necessary.
I'm really thinking this is a wiring issue. I pulled my spark plugs and they look and smell perfect thus making me believe I'm not like really leaning out!
I have the hotwire for the wideband hooked into one of those add-a-circuit things and it shares the spot with the 10amp "gauges"correct or not. on the dash fusebox, I believe its spot number 9.
I feel like I've read before that the wideband must be hardwired all by itself...not sure if this is correct or not but would like some input.
Also the grounds for all 3of my gauges (WB, FUEL AND BOOST) are all on the same ground location which was a spot under the dash panel behind/under the steering wheel..could my ground cause the gauges to act odd? I knowy fuel pressure is about 10psi off from what my gauge I put on the rail reads.
Just thinking to myself outloud on here but can't make it to car to work on it for few days do figured I'd ask some more questions
Thanks
I have the hotwire for the wideband hooked into one of those add-a-circuit things and it shares the spot with the 10amp "gauges"correct or not. on the dash fusebox, I believe its spot number 9.
I feel like I've read before that the wideband must be hardwired all by itself...not sure if this is correct or not but would like some input.
Also the grounds for all 3of my gauges (WB, FUEL AND BOOST) are all on the same ground location which was a spot under the dash panel behind/under the steering wheel..could my ground cause the gauges to act odd? I knowy fuel pressure is about 10psi off from what my gauge I put on the rail reads.
Just thinking to myself outloud on here but can't make it to car to work on it for few days do figured I'd ask some more questions
Thanks
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Verdad Gallardo I also think I ruled out the wiring or the WBO2. I pulled put the WBO2 and it reads full lean, and took a BIC lighter and sprayed the butane on the tip of the WBO2 and it went full rich (a/f of 10).
Also have realized that sometimes when at idle its around "stoich", 14.5-15. Other times it idles a little richer in the low-mid 13's range...this change happens withoute changing or adjusting anything...just happens.
I know that would help, but I don't have any means for data logging and I really don't think its the tune.
Its the same tune I have had for a little over 2 years when I got my mail order tune from Frost. I doubt he would have set me to run this lean, and as hard as I've driven my car...going this lean, my engine would have been toasted by now.
Its the same tune I have had for a little over 2 years when I got my mail order tune from Frost. I doubt he would have set me to run this lean, and as hard as I've driven my car...going this lean, my engine would have been toasted by now.
I swapped in a new Bosch 17018 wideband sensor and that didn't help...
Checked for vacuum leaks and found zero...fixed small exhaust leak...
Still have nothing. I just ordered a obd2 reader so I can read the fuel trims and o2 sensor voltage and all those goodies ...
BUT! Until then if anyone had some ideas....I'm begging
Checked for vacuum leaks and found zero...fixed small exhaust leak...
Still have nothing. I just ordered a obd2 reader so I can read the fuel trims and o2 sensor voltage and all those goodies ...
BUT! Until then if anyone had some ideas....I'm begging
BUT! Until then if anyone had some ideas....I'm begging
Basically what you need is a tuner that can actually drive the car and see what changes it needs, then making those changes and starting all over to see what else needs to be done. Till then, what you have is a "guess" of a tune.
Also, I would not be driving that car hard until you can fix the tune. Anything over 13.5 at WOT for a short period of time is going to be catastrophic for your engine.