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6.1 FTW
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2,307 Posts
Discussion Starter · #1 ·
I am trying to get through some very odd tuning issues with my truck and want to ask some help from yall. If a bunch of you guys can do this experiment and post results it might help me. Here's the procedure:


1. Start truck and get up to temp.
2. Idle in Park
3. Record AFR and RPM. If you have a scangauge record MAP press.
4. Pump brake fast 10-15 times.
5. Record AFR and RPM (and MAP if available), note any changes in other parameters.
6. Come on here and reply with your AFR-1, RPM-1, AFR-2 and RPM-2 along with any other observations.

Should be real quick and easy to do. I really appreciate anybody who can do this. Thanks dudes.
 

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Banned
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6,990 Posts
From 10-15 I am pumping the brakes...I dont have a scan gauge so all I got is AF for ya....

Time RPM AFR W R
0.000 677 14.8 0 0
0.100 678 14.7 0 0
0.200 678 14.7 0 0
0.300 680 14.7 0 0
0.400 680 14.7 0 0
0.500 682 14.7 0 0
0.600 682 14.7 0 0
0.701 682 14.7 0 0
0.801 682 14.7 0 0
0.901 682 14.7 0 0
1.001 682 14.8 0 0
1.101 682 14.8 0 0
1.201 682 14.8 0 0
1.301 682 14.8 0 0
1.402 682 14.8 0 0
1.502 683 14.8 0 0
1.602 683 14.8 0 0
1.702 682 14.8 0 0
1.802 682 14.8 0 0
1.902 682 14.8 0 0
2.002 682 14.8 0 0
2.103 682 14.8 0 0
2.203 682 14.8 0 0
2.303 682 14.8 0 0
2.403 683 14.7 0 0
2.503 683 14.8 0 0
2.603 681 14.8 0 0
2.703 682 14.8 0 0
2.804 682 14.8 0 0
2.904 681 14.8 0 0
3.004 681 14.8 0 0
3.104 680 14.8 0 0
3.204 680 14.8 0 0
3.304 681 14.8 0 0
3.404 682 14.8 0 0
3.505 682 14.8 0 0
3.605 682 14.8 0 0
3.705 682 14.8 0 0
3.805 683 14.8 0 0
3.905 683 14.8 0 0
4.005 684 14.8 0 0
4.105 685 14.7 0 0
4.206 685 14.7 0 0
4.306 686 14.7 0 0
4.406 686 14.7 0 0
4.506 686 14.7 0 0
4.606 686 14.7 0 0
4.706 687 14.7 0 0
4.806 686 14.7 0 0
4.907 686 14.8 0 0
5.007 685 14.8 0 0
5.107 685 14.8 0 0
5.207 684 14.8 0 0
5.307 684 14.8 0 0
5.407 683 14.8 0 0
5.507 682 14.8 0 0
5.608 682 14.8 0 0
5.708 682 14.8 0 0
5.808 682 14.8 0 0
5.908 683 14.8 0 0
6.008 683 14.7 0 0
6.108 681 14.7 0 0
6.209 680 14.7 0 0
6.309 680 14.7 0 0
6.409 680 14.7 0 0
6.509 680 14.7 0 0
6.609 680 14.7 0 0
6.709 680 14.8 0 0
6.809 680 14.8 0 0
6.910 680 14.8 0 0
7.010 679 14.8 0 0
7.110 678 14.9 0 0
7.210 678 14.9 0 0
7.310 680 14.9 0 0
7.410 680 14.9 0 0
7.510 680 14.9 0 0
7.611 680 14.8 0 0
7.711 681 14.8 0 0
7.811 682 14.8 0 0
7.911 682 14.8 0 0
8.011 681 14.7 0 0
8.111 681 14.7 0 0
8.211 680 14.7 0 0
8.312 680 14.7 0 0
8.412 680 14.7 0 0
8.512 680 14.7 0 0
8.612 680 14.7 0 0
8.712 679 14.7 0 0
8.812 679 14.8 0 0
8.912 679 14.8 0 0
9.013 679 14.8 0 0
9.113 677 14.8 0 0
9.213 677 14.8 0 0
9.313 677 14.8 0 0
9.413 679 14.8 0 0
9.513 679 14.8 0 0
9.613 680 14.8 0 0
9.714 680 14.8 0 0
9.814 680 14.8 0 0
9.914 681 14.8 0 0
10.014 681 14.7 0 0
10.114 682 14.8 0 0
10.214 682 14.7 0 0
10.314 682 14.8 0 0
10.415 682 14.8 0 0
10.515 684 14.8 0 0
10.615 685 14.8 0 0
10.715 685 14.8 0 0
10.815 685 14.8 0 0
10.915 685 14.8 0 0
11.015 688 14.9 0 0
11.116 688 14.9 0 0
11.216 692 14.9 0 0
11.316 695 14.9 0 0
11.416 695 14.9 0 0
11.516 699 14.9 0 0
11.616 699 14.9 0 0
11.716 704 14.9 0 0
11.817 708 14.8 0 0
11.917 708 14.8 0 0
12.017 712 14.8 0 0
12.117 712 14.8 0 0
12.217 718 14.8 0 0
12.317 722 14.8 0 0
12.417 722 14.8 0 0
12.518 726 14.8 0 0
12.618 729 14.8 0 0
12.718 729 14.8 0 0
12.818 732 14.8 0 0
12.918 732 14.8 0 0
13.018 735 14.8 0 0
13.118 738 14.8 0 0
13.219 738 14.8 0 0
13.319 742 14.8 0 0
13.419 743 14.8 0 0
13.519 743 14.8 0 0
13.619 745 14.8 0 0
13.719 745 14.8 0 0
13.819 745 14.8 0 0
13.920 747 14.8 0 0
14.020 747 14.8 0 0
14.120 748 14.8 0 0
14.220 748 14.8 0 0
14.320 748 14.8 0 0
14.420 748 14.8 0 0
14.520 748 14.8 0 0
14.621 746 14.8 0 0
14.721 746 14.8 0 0
14.821 746 14.7 0 0
14.921 745 14.7 0 0
15.021 745 14.7 0 0
15.121 745 14.7 0 0
15.221 744 14.8 0 0
15.322 744 14.8 0 0
15.422 745 14.8 0 0
15.522 744 14.8 0 0
15.622 744 14.8 0 0
15.722 743 14.8 0 0
15.822 743 14.8 0 0
15.922 743 14.8 0 0
16.023 743 14.8 0 0
16.123 743 14.8 0 0
16.223 743 14.7 0 0
16.323 742 14.7 0 0
16.423 742 14.7 0 0
16.523 740 14.8 0 0
16.623 740 14.8 0 0
16.724 738 14.8 0 0
16.824 736 14.8 0 0
16.924 736 14.8 0 0
17.024 734 14.8 0 0
17.124 734 14.8 0 0
17.224 730 14.8 0 0
17.324 723 14.8 0 0
17.425 723 14.7 0 0
17.525 718 14.6 0 0
17.625 718 14.5 0 0
17.725 713 14.5 0 0
17.825 713 14.5 0 0
17.925 708 14.4 0 0
18.025 704 14.4 0 0
18.126 704 14.4 0 0
18.226 700 14.4 0 0
18.326 700 14.4 0 0
18.426 696 14.5 0 0
18.526 696 14.5 0 0
18.626 692 14.5 0 0
18.727 690 14.5 0 0
18.827 690 14.6 0 0
18.927 687 14.6 0 0
19.037 687 14.6 0 0
19.137 684 14.6 0 0
19.237 684 14.7 0 0
19.337 682 14.7 0 0
19.438 680 14.7 0 0
19.538 680 14.8 0 0
19.638 678 14.8 0 0
19.738 678 14.8 0 0
19.838 676 14.8 0 0
19.938 676 14.8 0 0
20.038 674 14.9 0 0
 

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Boost, you say!?
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1,304 Posts
Pretty sure my truck leans out when I pump the brakes quickly and the idle gets weak, but I don't remember a RPM change. I think I can remember every vac boosted vehicle I've owned do this. My '06 Chev work truck will kick your foot off the pedal if you do this.
 

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6.1 FTW
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2,307 Posts
Discussion Starter · #6 ·
Mine goes insanely rich; from whatever AFR it is at to about 10 AFR - at times accompanied by an idle surge up to 1100 or so. Then calm down again and go back t0 where it was.

Trying to figure out if there is a brake booster leak or some other thing wrong. I've been experience a fairly violent cycling idle surge also, but almost only in park, not when in gear. It will do it in gear at times but really almost never.
 

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4,832 Posts
14.6 right about 750rpms
14.7 right about 900 rpms

Every now and then my truck will hunt for an idle for 5-10sec when I start it . Its not a big deal it goes between 600 and 1300rpms then calms right down. It does that maybe once every other month.
 
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