CystumMax

Does anyone know what causes the engine RPM to fluctuate? This is the results I got from The Auto Enginuity ODBII reader. This ODBII reader connects to my laptop and gives me the reading.
My car is Automatic, and I have about 70k mile on it. The idle results are after the engine wormed up. Last couple of the Reading shows the car in Drive.

Time Engine RPM (r/min) [0 - 9000]

06:08:15:432 787
06:08:15:773 800
06:08:16:113 800
06:08:16:444 787
06:08:16:784 800
06:08:17:115 800
06:08:17:455 800
06:08:17:785 787
06:08:18:116 787
06:08:18:446 787
06:08:18:787 787
06:08:19:117 787
06:08:19:448 787
06:08:19:788 800
06:08:20:129 787
06:08:20:469 787
06:08:20:970 787
06:08:21:301 787
06:08:21:631 800
06:08:22:052 800
06:08:22:382 800
06:08:22:723 787
06:08:23:063 800
06:08:23:394 787
06:08:23:724 787
06:08:24:095 800
06:08:24:425 800
06:08:24:766 800
06:08:25:106 787
06:08:25:446 800
06:08:25:777 787
06:08:26:117 800
06:08:26:508 800
06:08:26:879 787
06:08:27:259 800
06:08:27:620 800
06:08:28:020 762
06:08:28:391 800
06:08:28:781 800
06:08:29:152 787
06:08:29:522 800
06:08:29:903 812
06:08:30:273 787
06:08:30:664 787
06:08:31:035 787
06:08:31:405 800
06:08:31:786 787
06:08:32:156 787
06:08:32:517 800
06:08:32:887 787
06:08:33:268 787
06:08:33:638 787
06:08:33:999 787
06:08:34:369 800
06:08:34:760 800
06:08:35:130 787
06:08:35:511 787
06:08:35:902 787
06:08:36:272 787
06:08:36:643 787
06:08:37:013 787
06:08:37:384 787
06:08:37:764 787
06:08:38:135 787
06:08:38:505 787
06:08:38:866 800
06:08:39:256 800
06:08:39:627 787
06:08:40:027 787
06:08:40:408 787
06:08:40:779 762
06:08:41:139 762
06:08:41:520 787
06:08:41:890 800
06:08:42:261 762
06:08:42:651 787
06:08:43:022 762
06:08:43:392 762
06:08:43:763 787
06:08:44:153 787
06:08:44:514 787
06:08:44:874 762
06:08:45:265 762
06:08:45:636 762
06:08:46:006 750
06:08:46:387 787
06:08:46:757 762
06:08:47:148 787
06:08:47:518 750
06:08:47:889 762
06:08:48:289 762
06:08:48:660 762
06:08:49:030 762
06:08:49:401 762
06:08:49:771 787
06:08:50:152 762
06:08:50:513 762
06:08:50:883 737
06:08:51:254 750
06:08:51:624 762
06:08:52:005 737
06:08:52:365 737
06:08:52:736 737
06:08:53:086 750
06:08:53:457 762
06:08:53:827 737
06:08:54:198 737
06:08:54:568 762
06:08:54:939 737
06:08:55:309 750
06:08:55:680 737
06:08:56:081 737
06:08:56:451 750
06:08:56:822 750
06:08:57:192 750
06:08:57:563 750
06:08:57:933 737
06:08:58:324 750
06:08:58:694 750
06:08:59:065 762
06:08:59:435 750
06:08:59:806 737
06:09:00:176 737
06:09:00:547 737
06:09:00:918 737
06:09:01:288 737
06:09:01:659 737
06:09:02:029 737
06:09:02:400 737
06:09:02:770 737
06:09:03:141 737
06:09:03:511 750
06:09:03:872 737
06:09:04:252 750
06:09:04:613 737
06:09:04:983 750
06:09:05:354 750
06:09:05:724 737
06:09:06:095 712
06:09:06:465 712
06:09:06:826 712
06:09:07:207 737
06:09:07:567 737
06:09:07:938 737
06:09:08:328 737
06:09:08:679 712
06:09:09:049 737
06:09:09:420 737
06:09:09:790 737
06:09:10:151 737
06:09:10:521 712
06:09:10:892 737
06:09:11:262 737
06:09:11:633 750
06:09:12:033 750
06:09:12:404 750
06:09:12:775 750
06:09:13:155 737
06:09:13:516 762
06:09:13:876 750
06:09:14:247 750
06:09:14:617 750
06:09:14:988 750
06:09:15:358 750
06:09:15:729 750
06:09:16:099 737
06:09:16:470 750
06:09:16:830 737
06:09:17:201 737
06:09:17:581 750
06:09:17:942 750
06:09:18:323 750
06:09:18:683 737
06:09:19:074 750
06:09:19:454 750
06:09:19:825 737
06:09:20:195 750

njmaxseltd

iTrader: (19)

Do you actually see the tach moving around?
Can you feel a misfire?

A faulty or out of adjustment TPS causes the engine idle speed to hunt.

Zirafa

Maybe all the worms that are in there are causing it? j/k

Try cleaning your throttle body and IACV.

CystumMax

I did clean the Throttle body but where is the IACV located. Can someone tell me. My car year is 1999. I want to know exact location thanks.

dzw

I can send your a pdf file, but I need your E-mail address first.