My Ongoing Misfire. Finally a LOG!

[Gregory]

Hey guys. If you want the full story, here is the link to the thread I've built:

http://www.dsmtuners.com/forums/showthread.php?t=263430

Now, I finally got my logger working, so I did a really quick pull in second gear, and If I'm right, that looks like a lot of timing being pulled. Please help. My car falls on its face.

Time,RPM,Timing
00:00.43,2383.0,19.0
00:00.86,2680.0,19.0
00:01.30,2973.0,16.0
00:01.74,3289.0,13.0
00:02.18,3660.0,10.0
00:02.61,4063.0,9.0
00:03.05,4469.0,10.0
00:03.49,4875.0,11.0
00:03.92,5227.0,10.0
00:04.36,5594.0,15.0
00:04.80,5926.0,16.0
00:05.23,6156.0,18.0
00:05.67,6387.0,17.0
00:06.11,6477.0,16.0
00:06.53,5660.0,38.0


Thanks!

 

[spyderturbo007]

Spool looks a little late and you seem to be knocking above 6.2k. I checked your profile and provided it's up to date, I'm guessing your problem is going to be fuel delivery. A 16g @ 15psi is probably pushing it for the stock fuel system. Have you rewired your pump? Make another pull in 3rd gear from 2.5k to redline and log timing, O2 front, airflow and rpm. Then post that up.

 

[Gregory]

That was actually a 12psi pull, but I had a suspicion it was fuel related with that timing. Does that sound right? I'm new to tuning, but I'm learning. I have the fuel pump and an aeromotive fpr, it just hasn't gone on yet. Thanks for the reply. I'll get that log up tomorrow or tonight.

 

[spyderturbo007]

It's hard to say unless I can look at the airflow. It could be a bunch of things causing the timing pull, but we'll get you straightened out. Have you done a leak check? What plugs are you running and what do you have them gapped to?

 

[WOTDSM]

What is your ignition timing set at? When I got my car, mine was set at 10* and we advanced (correct me if i actually retarded it. I always get those confused) the timing to 5* and I started having a plethora of problems: misfiring, stumbling when cracking throttle open, and just crappy performance overall. Check your base timing with a gun, don't go by your datalogger as the timing that sees is different than what the gun shows.

 

[spyderturbo007]

You can't check the timing on a 2g unless it's a '95 / early '96 model year or you have DSMLink.

 

[DirtyBirdRacing]

What is your ignition timing set at? When I got my car, mine was set at 10* and we advanced (correct me if i actually retarded it. I always get those confused) the timing to 5* and I started having a plethora of problems: misfiring, stumbling when cracking throttle open, and just crappy performance overall. Check your base timing with a gun, don't go by your datalogger as the timing that sees is different than what the gun shows.

I think you mean that you retarded it 5* to 5* BTDC. Just wanted to make sure that no one got confused becasue that shit use to confuse the sh*t out of me too.

Bill

 

[Gregory]

Hey guys. Sorry that it's taken me about a week to reply, but I've been away and havn't been able to get to a computer that hooks to my logger. Here's a new 3rd gear log I did, but as you can see I only went to about 6k cause it started falling on its face, and I didnn't want to hurt it. Hope this helps. Is this everything I need to log? Thanks for the replies!


time RPM Timing O2 1 bank 1 O2 Trim 1 Bank 1
3.28 2105.0 26.0 0.08 4.69
3.92 2168.0 27.0 0.64 6.25
4.58 2305.0 15.0 0.88 0.0
5.24 2461.0 16.0 0.9 0.0
5.89 2629.0 14.0 0.9 0.0
6.55 2813.0 12.0 0.92 0.0
7.21 3027.0 10.0 0.92 0.0
7.86 3254.0 8.0 0.94 0.0
8.51 3504.0 8.0 0.94 0.0
9.16 3777.0 8.0 0.94 0.0
9.83 4027.0 9.0 0.96 0.0
10.48 4297.0 10.0 0.96 0.0
11.13 4520.0 10.0 0.96 0.0
11.79 4742.0 10.0 0.96 0.0
12.44 4965.0 11.0 0.94 0.0
13.09 5203.0 13.0 0.94 0.0
13.75 5387.0 14.0 0.92 0.0
14.41 5586.0 11.0 0.92 0.0
15.07 5758.0 12.0 0.92 0.0
15.73 5891.0 14.0 0.88 0.0

 

[Gregory]

Crap. I forgot to log airflow for you guys. I'm sorry; I'm gonna go do another pull right now. Also, yes, I have done a boost leak check and I'm running the bpr7's gapped to .28 right now. I had the 6's, but it was just one attempt to correct my misfire. Is it hurting me by running the 7's at this stage? Thanks.

 

[Gregory]

Here you go. I just went and did another. Same thing; misfire in cyl 1, so I got off it at 6k. You can here the misfire really bad.
time RPM Timing Airflow O2 Bank1 O2 Trim 1 O2 Trim 2 O2 2 Bank 1
12.01 1891.0 32.0 0.59 0.08 6.25 0.86 0.0
13.1 2105.0 8.0 4.43 0.92 0.0 0.94 0.0
14.2 2395.0 12.0 5.08 0.9 0.0 0.92 0.0
15.3 2676.0 12.0 6.15 0.92 0.0 0.92 0.0
16.38 3012.0 11.0 8.05 0.92 0.0 0.94 0.0
17.47 3395.0 8.0 11.1 0.94 0.0 0.96 0.0
18.56 3781.0 8.0 13.56 0.96 0.0 0.96 0.0
19.66 4180.0 8.0 15.12 0.96 0.0 0.96 0.0
20.75 4547.0 11.0 16.7 0.96 0.0 0.96 0.0
21.84 4918.0 10.0 17.96 0.96 0.0 0.96 0.0
22.93 5234.0 12.0 19.27 0.96 0.0 0.96 0.0
24.02 5508.0 13.0 20.16 0.94 0.0 0.96 0.0
25.12 5707.0 12.0 21.15 0.94 0.0 0.94 0.0
26.22 5918.0 10.0 21.44 0.9 0.0 0.92 0.0
27.31 6055.0 11.0 21.55 0.86 0.0 0.9 0.0

 

[Gregory]

Is that an okay log? What can you guys make of it?

 

[Gregory]

I'm suprised I haven't gotten any responces. Did I log everything correctly? Thanks.

 

[spyderturbo007]

You probably didn't get any responces this weekend, because of everyone being at the SO Also, be careful, because the Mods will lock a post when it gets bumped.

Anyway, your spool still looks late for a 16g and you are still knocking pretty good. Was this log at 12psi again? You are well within the limits for the stock fuel system, unless you have a problem like a clogged fuel filter or injector.

How old are your wires? You might want to look into something like fuel filter, wires, leak check, injector cleaner, etc to try and nail down the misfire. There is definatlely something wrong here. Have you checked things like IAT and coolant temp at idle? I'm just throwing easy things out there to check, because this is going to be pretty tough to pin down.

Oh, and for the log, you don't have to log all the O2 parameters, just O2 (Bank 1) if you are running pocketlogger and O2-R if you are running MMCd.

 

[DirtyBirdRacing]

I'm pretty sure that you also dont need to log the time.

Bill

 

[Gregory]

Spyderturbo007, thanks so much for your time. (And I deleted the repeat thread, just so you know. I thought this one got deleted).

First, how can you tell that I am knocking?

The pull was at 12psi again, yes. I ran some injector cleaner through it not long ago, but the fuel filter hasn't been changed. Where can I get one (Pep Boys doesn't stock them). Does Autozone?

I have a COP setup right now, but I got it because I thought it was misfiring from bad coils, and the price was right on the setup. So, no wires. Boost leak check was done and fixed one leak.

Next log I post, I will just post those criteria. I'll check idle coolant temp too. What is IAT?

Thanks for your help buddy! I'll try to find out where I can get a fuel filter.