What does it all mean? ATAP #s
03-25-2003, 03:54 PM
#1
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What does it all mean? ATAP #s I've been trying to resolve an issue I've had since installing mods (Vortex Ram air, Power duct, GMAF, X-pipe, Corsa exhaust). At low throttle and near steady speeds, my C5 "trailer's" or "lean surges" or bumps, whatever! I'm not sure what to call it.
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
I just purchased ATAP and I have recorded the issue and see the O2 sensors all over the place while maintaining a steady throttle. Any suggestions?
OSB1S1 B2S1 LTFTB1 LTFTB2 RPM TP
781 191 5.47 5.47 2472 20.8
339 816 5.47 5.47 2473 20.8
65 230 5.47 5.47 2474 20.8
764 608 5.47 5.47 2480 20.8
773 781 5.47 5.47 2480 20.8
161 486 5.47 5.47 2481 20.8
291 690 5.47 5.47 2482 20.4
799 621 5.47 5.47 2483 20.4
96 48 5.47 5.47 2479 20.4
69 655 4.69 5.47 2476 20.4
74 286 4.69 5.47 2476 20.4
794 148 4.69 5.47 2477 20.4
530 820 4.69 5.47 2481 20.4
490 803 4.69 5.47 2482 20.4
851 812 4.69 5.47 2484 20.4
777 760 4.69 5.47 2485 20.4
786 716 4.69 5.47 2487 20.4
816 747 4.69 5.47 2480 20.8
764 703 4.69 5.47 2483 21.2
760 694 4.69 5.47 2482 21.2
707 521 4.69 5.47 2485 21.2
65 61 4.69 5.47 2485 21.2
464 760 4.69 5.47 2485 21.2
790 577 4.69 5.47 2491 21.2
96 109 4.69 5.47 2489 21.2
139 799 4.69 5.47 2490 21.2
747 347 4.69 5.47 2486 21.2
165 760 3.91 5.47 2488 21.2
91 786 3.91 5.47 2490 21.2
799 590 3.91 5.47 2492 21.2
503 647 3.91 5.47 2493 21.2
74 178 3.91 5.47 2496 21.2
I sure could use some help, the Dealer can't fix anything without a fault code! <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
I just purchased ATAP and I have recorded the issue and see the O2 sensors all over the place while maintaining a steady throttle. Any suggestions?
OSB1S1 B2S1 LTFTB1 LTFTB2 RPM TP
781 191 5.47 5.47 2472 20.8
339 816 5.47 5.47 2473 20.8
65 230 5.47 5.47 2474 20.8
764 608 5.47 5.47 2480 20.8
773 781 5.47 5.47 2480 20.8
161 486 5.47 5.47 2481 20.8
291 690 5.47 5.47 2482 20.4
799 621 5.47 5.47 2483 20.4
96 48 5.47 5.47 2479 20.4
69 655 4.69 5.47 2476 20.4
74 286 4.69 5.47 2476 20.4
794 148 4.69 5.47 2477 20.4
530 820 4.69 5.47 2481 20.4
490 803 4.69 5.47 2482 20.4
851 812 4.69 5.47 2484 20.4
777 760 4.69 5.47 2485 20.4
786 716 4.69 5.47 2487 20.4
816 747 4.69 5.47 2480 20.8
764 703 4.69 5.47 2483 21.2
760 694 4.69 5.47 2482 21.2
707 521 4.69 5.47 2485 21.2
65 61 4.69 5.47 2485 21.2
464 760 4.69 5.47 2485 21.2
790 577 4.69 5.47 2491 21.2
96 109 4.69 5.47 2489 21.2
139 799 4.69 5.47 2490 21.2
747 347 4.69 5.47 2486 21.2
165 760 3.91 5.47 2488 21.2
91 786 3.91 5.47 2490 21.2
799 590 3.91 5.47 2492 21.2
503 647 3.91 5.47 2493 21.2
74 178 3.91 5.47 2496 21.2
I sure could use some help, the Dealer can't fix anything without a fault code! <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />
03-25-2003, 04:25 PM
#2
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Re: What does it all mean? ATAP #s O2s always bounce in closed loop, the system
works off the average. The transfer function
is too abrupt and the loop too slow to make
it a tight linear control loop. Only in open
loop (WOT, or cold) will you see consistent
O2 voltages, and these will probably be
slammed one way or the other.
The LTFTs are all positive, you are lean
(prior to trim). The GMAF is the usual suspect.
Can you retry the stock MAF? Failing that, you
would want to adjust the mixture (MAFT or Edit).
works off the average. The transfer function
is too abrupt and the loop too slow to make
it a tight linear control loop. Only in open
loop (WOT, or cold) will you see consistent
O2 voltages, and these will probably be
slammed one way or the other.
The LTFTs are all positive, you are lean
(prior to trim). The GMAF is the usual suspect.
Can you retry the stock MAF? Failing that, you
would want to adjust the mixture (MAFT or Edit).
