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2G Guys I'm looking for help; diagnosing a bog.

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miliman13

10+ Year Contributor
1,957
276
Jan 1, 2011
tampa, Florida
Gentleman, some of you already know me around the site, that being said I like to solve before starting pointless threads like so many new members. But I feel I could use of your assistance.

From one day to the next, I started to bog out around 7psi 3500rpm give it take. I search around tested the common causes. No luck so far.
Please let's get passed the boost leak , some may immediately jump too. I have to many years of boost leaks so it's not that.

So far I replaced plugs and wires.
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I tested the power transistor and got continuity in all cylinders.
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.
I also took pics of my ECU, I don't see anything that sticks out, so I posted pics so you guys can help me check, sometimes capacitors are the cause.


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ECU LAST SERVICES BY ECM IN 2009/2010.

now, I also tested my cool pack at room temp, and unpluged I came in at around 15-16kohms. And plugged in at around 1.3-1.5ohms which is out of speed according to the manual.

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Also I snaked my fuel pressure gauge close to the wind shield to see if it's fuel cut and it doesn't appear so, I base this on the fact that the pressure climbs as the boost climbs which is expected.

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So I'm looking for guidance. I know it will be hard as few DSM guys really get this technical with diagnosing. So any help is good.
 
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suddenly the thread goes quiet! :idontknow:.

So i captured a log at WOT and it still boggs !!:beatentodeath:

IDK, i cheched everything.
So now i notice i am going super rich at WOT before it was not so it was around 12.5 or so.

Also my aem WB is assigned to RearO2 and as AEM R1, thats how it reads in sync with gauge.
 

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I did not mention this before, since it made no sense! But this all happened after I disconnected my battery to do some electrical work. And then jump started the car! To turn it on when I was done. That's how I went from being fine, to having this cancer!!


But v3 doesn't lose its tune?
Even though the person who tuned it, theorized it as a possibility, since he has experienced the scenario!!.
My luck is, I can't get an answer on if he still has it saved on his comp..

Is this possible.??
 
I couldn't find a post where you stated what your injectors were.

Why so much low RPM MAF Comp?

Your CombinedFT is way out at idle (+25%) adding fuel but swings into the -10% pulling fuel at 3k RPM. If the MAF and Injectors were dialed in that shouldn't happen. If you were overrunning the FPR the ECU typically pulls fuel at idle not adds it, so that's not it. Sounds more like fuel global and deadtime are off.

You can see that you hit the launch limiter 18.6 and 50 seconds.

I question the WB data logged.
 
Injectors are 750 clinical, low impedance.
The set gobla and dead time. Were perfect before. As far as the low hz that is unknown. What you are seeing (if nothing was erased) are the settings created by my Tuner. Like I said before it ran fine then one day this problem.

My WB in link macthes my gauge.
As far as the fuel trims idk. Like I said one day to the next. I wish I had the answers.
Steve. Have you ever seen anything closely related to this?
 
From one day to the next, I started to bog out around 7psi 3500rpm give it take.

Is this still the problem?

You've touched or changed many things since the beginning of the thread in the process of diagnosis.

I mentioned both hitting the launch limiter and the problem with your fuel trims since both could cause something that might be described as a "Bog". Perhaps a more detailed description of what you're chasing would help.

The ECU looks to be configured to use the speed sensor for deciding if launch rev limiting should be active rather than either clutch switches a loss of the speed sensor signal for a moment could trigger the limiter and cause a serious bog.

With the trims as they are you're passing through fueling going from being leaner that expected to richer that expected. This is going to play havoc with AFR and you can see in the log how it causes a delay in O2 switching while the ECU drives the trims from one extreme to the other trying to get feedback for closed loop. If I could say for sure that the log showed a transition from vacuum to boost that behavior would point to a boost leak but it looks like the car was sitting still.
 
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From your last log it shows at idle your ecu wants it to be very rich and according to ecmtuning fic 750 injectors should have a global of -40 and 330 deadtime. Try that fuel setting and see what the afratioest is. Also get that tps to .63v instead of .65v. I know when I run the tps adjustment I have to take away a -1 on tps offset to get .63v. Can you post a log with those fuel settings and a zero'd out maf comp?
 
I'll add another log, this time at cruise, 3rd grear pull. Then I will go and adjust fuel and maft sliders and reset fuel trims to match expected values and post another log. Reason is to email my current data to my Tuner for diagnosis.
Is still the problem?
Yes even with all my tinkering. Didn't seem like my checking changed anything.
 
The ECU looks to be configured to use the speed sensor for deciding if launch rev limiting should be active rather than either clutch switches a loss of the speed sensor signal for a moment could trigger the limiter and cause a serious bog.
I was not aware of this. How can you view this setting and can it be adjusted?
 
From your last log it shows at idle your ecu wants it to be very rich and according to ecmtuning fic 750 injectors should have a global of -40 and 330 deadtime. Try that fuel setting and see what the afratioest is. Also get that tps to .63v instead of .65v. I know when I run the tps adjustment I have to take away a -1 on tps offset to get .63v. Can you post a log with those fuel settings and a zero'd out maf comp?
Try a log with these settings. Try your tpsoffset at -11 to see if it goes to .63v at idle not .65v
 
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