Tip in throttle hesitation
04-28-2004, 01:54 PM
#1
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Tip in throttle hesitation I did a search on the forum for this but there was no answer given.
My car while cruising on the hiway goes really lean when I go from off throttle to a slight increase. Like 19:1 A/F or so from normal. I happens in all gears but is most noticeable in 6th/5th. There is a stumble right upon touching the throttle and then it returns to a normal a/f.
What do I adjust in edit?
My car while cruising on the hiway goes really lean when I go from off throttle to a slight increase. Like 19:1 A/F or so from normal. I happens in all gears but is most noticeable in 6th/5th. There is a stumble right upon touching the throttle and then it returns to a normal a/f.
What do I adjust in edit?
04-28-2004, 05:43 PM
#2
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Originally Posted by Spinmonster
I did a search on the forum for this but there was no answer given.
My car while cruising on the hiway goes really lean when I go from off throttle to a slight increase. Like 19:1 A/F or so from normal. I happens in all gears but is most noticeable in 6th/5th. There is a stumble right upon touching the throttle and then it returns to a normal a/f.
What do I adjust in edit?
My car while cruising on the hiway goes really lean when I go from off throttle to a slight increase. Like 19:1 A/F or so from normal. I happens in all gears but is most noticeable in 6th/5th. There is a stumble right upon touching the throttle and then it returns to a normal a/f.
What do I adjust in edit?
Gary
04-28-2004, 08:23 PM
#5
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Originally Posted by Spinmonster
the hesitation is at 1-3% throttle from 0%-foot off pedal
Gary
04-29-2004, 10:34 AM
#6
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typical is a 1800-2k rpm....auto-tap shows nothing wrong with ltrims....it could be too low a resolution....the car goes mega lean (off the scale) for a split second on an A/F meter.....wideband doesnt show anything...too fast....
The O2's are brand new so it wasn't that.
The O2's are brand new so it wasn't that.
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04-29-2004, 12:46 PM
#8
Originally Posted by Spinmonster
typical is a 1800-2k rpm....auto-tap shows nothing wrong with ltrims....it could be too low a resolution....the car goes mega lean (off the scale) for a split second on an A/F meter.....wideband doesnt show anything...too fast....
The O2's are brand new so it wasn't that.
The O2's are brand new so it wasn't that.
I would expect an instantaneous spike as air rushes in and the PCM adjusts ( using a high sensitivity meter). I wouldn't expect that you would feel it - SOP.
If you can feel it SOP then, depending on the Mods, you might adjust VE at the effected RPM and kPa.
Good Luck
joel
04-29-2004, 01:44 PM
#9
since the cam & my tuning ive been having a wot hesitation issue...im going back to my tuner next week. But if i smack the throttle it hesitates for about a 1/2 second till it catches itself and then starts spooling up but this means i cant get the converter to flash. Anyone know what that could be?
04-29-2004, 08:45 PM
#10
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WOT is no issue. The car is punchy and powerful. Part throttle is responsive and awesome. The only issue is cruise on the hiway steady at 2k or so....i come off the gas it stays in range....I slightly touch the throttle: massive lean a/f for a split second then the car uns normal again.
Mods: forged LS6 348, flp's, stage2 LS6 heads, high flow cats, ported TB, screenless MAF, 4.10's, spec 3, alum fly, ud pulley, 100 shot, 11.45:1 CR no detonation, blackwing, 2001 C5. I tried changing the MAP sensor, MAF, TB, TP sensor, and no change. It is slight and isnt detectable outside 5th and 6th on the hiway.
Mods: forged LS6 348, flp's, stage2 LS6 heads, high flow cats, ported TB, screenless MAF, 4.10's, spec 3, alum fly, ud pulley, 100 shot, 11.45:1 CR no detonation, blackwing, 2001 C5. I tried changing the MAP sensor, MAF, TB, TP sensor, and no change. It is slight and isnt detectable outside 5th and 6th on the hiway.
04-29-2004, 08:47 PM
#11
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by the way...if I hit the throttle harder and not to WOT like 20% it doesnt do it. Only on tip in....slight 1-3% on it
seems like it doesnt get enough fuel for that particular throttle position.....or look at it as too much air.
What tables adjust for the air/fuel at 1-3% throttle closed loop?
seems like it doesnt get enough fuel for that particular throttle position.....or look at it as too much air.
What tables adjust for the air/fuel at 1-3% throttle closed loop?
04-29-2004, 09:06 PM
#12
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Originally Posted by Spinmonster
by the way...if I hit the throttle harder and not to WOT like 20% it doesnt do it. Only on tip in....slight 1-3% on it
seems like it doesnt get enough fuel for that particular throttle position.....or look at it as too much air.
What tables adjust for the air/fuel at 1-3% throttle closed loop?
seems like it doesnt get enough fuel for that particular throttle position.....or look at it as too much air.
What tables adjust for the air/fuel at 1-3% throttle closed loop?
Gary
04-29-2004, 10:15 PM
#13
Originally Posted by Spinmonster
by the way...if I hit the throttle harder and not to WOT like 20% it doesnt do it. Only on tip in....slight 1-3% on it
seems like it doesnt get enough fuel for that particular throttle position.....or look at it as too much air.
What tables adjust for the air/fuel at 1-3% throttle closed loop?
seems like it doesnt get enough fuel for that particular throttle position.....or look at it as too much air.
What tables adjust for the air/fuel at 1-3% throttle closed loop?
joel
04-29-2004, 10:59 PM
#15
Originally Posted by Spinmonster
ok so a-tap for mapvsrpm and when i find these values I add what to the 1800-2200 area of the main VE?
It will be in a narrow MAP range hopefully. I'd try 15% increase (Mult *125%) in the affected kPas. Take it out and see how she does. Fine tune from there. If you richen it up past around 25 - 35% it may drop into speed density mode as the MAF will be out of range. So if it it starts running like sh#t in this area of RPM, and codes 0101, pull the VE back down.
Let us know how it turns out.
FWIW.You can lean/reduce the VE table bigtime without codes or dropping off the MAF. Richen/increasing seems to be a different story.
joel
05-01-2004, 11:55 AM
#16
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and the winner is: Joel...(BINKS). When you mentioned MAF I recalled you saying on a prior post of mine to use the 02 ZO6 table for the screenless MAF so I put that table in......99% better. It drives so close to perfect now that I wouldn't think of touching it now. In fact in about 30 attempts to get it to studder....it did it once. I guess the MAF is the issue for the cell to cell transition for cars that have this issue. The other gears don't show the symptoms since they would be at a different RPM and therefore use a Different reading and possibly be WOT due to the much higher rpm's involved for those speeds. Thanks to all for the help.
07-22-2004, 09:27 AM
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Originally Posted by Spinmonster
and the winner is: Joel...(BINKS). When you mentioned MAF I recalled you saying on a prior post of mine to use the 02 ZO6 table for the screenless MAF so I put that table in......99% better. It drives so close to perfect now that I wouldn't think of touching it now. In fact in about 30 attempts to get it to studder....it did it once. I guess the MAF is the issue for the cell to cell transition for cars that have this issue. The other gears don't show the symptoms since they would be at a different RPM and therefore use a Different reading and possibly be WOT due to the much higher rpm's involved for those speeds. Thanks to all for the help.
Where can I get the 02 Z06 MAF table information?
07-22-2004, 09:40 AM
#19
Bottom of the page.
http://ls1howto.com/index.php?articl...9da943a9bf4e5b
jmx has a good explanation above the table. Good Luck.
http://ls1howto.com/index.php?articl...9da943a9bf4e5b
jmx has a good explanation above the table. Good Luck.
very helpful