Please view my MMCD log at idle

[4gfun]

Hi,

This will be one of my first (if not my first) attempt at posting a log using mmcd 1.8g. I used MMCD tools to convert from pdb to csv. I logged it at idle (hitting the stutterbox a few times as you can see). It is being logged at idle as a starting point and since I am having trouble getting my 2nd gear pull off of my pc right now.

History and tune:

My vehicle is having a problem where it starts misfiring at about 5100 rpm and doesn't stop at higher RPM(s).

The problem is more persistent in 1st and 2nd gears and my logs will be taken in 1st and 2nd gears (for now) for now due to Virginia's very strong reckless driving laws.

The vehicle is boost leak free with new NGK blue wires, NGK BPR7ES plugs gapped at .028 (smaller gaps don't help the problem), and I have already tried another coil pack. I am running a pre-cat open cutout. Fuel pressure is stock. New fuel filter and fuel pressure is reading ~37 psi at idle. Injectors are FIC 650's.

Base timing is set at 5 degrees BTDC.

Compression is ~164 in all cylinders and the pistons are 1g.

Boost is at or about 18 PSI via my Tial external wastegate. MBC is not involved at this point.

The vehicle is tuned with RT Tuner Pro and fuel cut has been disabled in the tune. I have an Innovate Wideband and I am running the vehicle on 93 pump gas. All other mods are listed in the profile.

I have a tune that the previous owner set up on this vehicle, the vehicle used to run fine on it but now this problem has appeared. My point is that I have run different tunes with different timing advance and fuel curves (stock 2 g timing map and 10.8:1 A/F ratio) but the problem persists.

I am looking down at my wideband when I am doing WOT pulls and it is reading anywhere between 11.3-11.7 @ WOT which I am sure is on the lean end.

Questions:

1) Is the attached log how you want things to appear to troubleshoot this issue?

2) Is the attached log how you want things to appear when the issue is fixed and I want to tune for power?

I ask questions 1 and 2 because my laptop serial port is on it's way out and I am forced to use very unreliable infrared so I want to get this right without making alot of revisions.​

3) I intended to show injector duty cycle but I am seeing what seems to be injector pulse width in milliseconds. Am I logging the wrong parameter or am I doing something wrong?

4) I have tried to log my wideband because most posts on this forum seem inconclusive as to whether or not the results are accurate.

Thank you for your time.

 

[MY1GDSM]

Can you post the PDB file rather then the Converted CVS?

 

[4gfun]

I can't right now since I am not in front of the pc that has it, but sure I could once I am in front of it. I will attach both file types moving forward.

Thanks

Can you post the PDB file rather then the Converted CVS?

 

[Mischif]

You can log both injector duty and injector pulse width with mmcd. Look through all the pages and make sure you have injector duty checked.

 

[4gfun]

Thanks...I think that last time I tried this I was able to do that. Will check again.

You can log both injector duty and injector pulse width with mmcd. Look through all the pages and make sure you have injector duty checked.

I attempted to upload the pdb file here. Unfortunately, it would not upload and did not give me an error message when I attempted to do so.

When I took a closer look, that file extension is not permitted as an upload here.

Can you post the PDB file rather then the Converted CVS?

All, please let me know if not having a pdb file will be an issue for you. If I don't hear back from anyone, I will assume that the csv file I am posting is sufficient.

Also, I have located the IJDC parameter. I will take another log and post it here.

Finally, does everyone agree that the parameters I am posting are sufficient for Questions 1 & 2? I want to get this right the first time. Is there anything else that you want to see logged? If I don't hear back from anyone in that regard I will assume that the parameters I am posting in the csv file are sufficient.

Thanks

Ok everyone, I have finally been able to upload the 2nd gear mmcd WOT pull I did yesterday. I uploaded it in csv format and xls format (highlighted the knocking rows in red).

Please keep in mind once again that duty cycle was not logged but injector pulse width was. I believe that this can be translated and if I knew how to use excel formulas the IDC would be even more evident at all times. I'll make another pull with IDC specifically logged when possible at a later time. However using the formula "injpw*rpm/1200" I calculate the IDC for my injectors at 4937 RPM to be 67%.

Anyways, I see quite a bit of knock coming close to 4000 RPM at WOT.

Any thoughts?

Thanks

 

[MY1GDSM]

If you can get the PDB I could try to let you know what I see... Might PM a mod an see if they can add it to the list of available files to upload....

It's much easier and quicker for me to get a look at then going threw a Comma-separated values spreadsheet... .

Not a lot to go off of in that log... But I'd See what type of airflow you are hitting and richen things up to get it all in line with you target AFR the next simplest thing and drop a few degrees of timing starting a 4k in the load cells you are hitting before picking up knock.

 

[4gfun]

Thanks for this. What MMCD parameter did you want me to log for airflow? I have pm'd a mod to see if they can do that.

If you can get the PDB I could try to let you know what I see... Might PM a mod an see if they can add it to the list of available files to upload....

It's much easier and quicker for me to get a look at then going threw a Comma-separated values spreadsheet... .

Not a lot to go off of in that log... But I'd See what type of airflow you are hitting and richen things up to get it all in line with you target AFR the next simplest thing and drop a few degrees of timing starting a 4k in the load cells you are hitting before picking up knock.

 

[MY1GDSM]

It will be the Item MAFS it is the Airflow hz... .

As with anything make sure that all of this is addressed as well or nobody will be able to help.

http://www.dsmtuners.com/forums/log-file-advice/443164-please-read-before-you-ask-log-advice.html

Thanks

 

[4gfun]

Thank you, will add that item.

I have already read that link and made sure that I posted that I had done the things that were requested there. If you see something that I missed, please let me know.

It will be the Item MAFS it is the Airflow hz... .

As with anything make sure that all of this is addressed as well or nobody will be able to help.

http://www.dsmtuners.com/forums/log-file-advice/443164-please-read-before-you-ask-log-advice.html

Thanks

 

[MY1GDSM]

Looking over everything here and mods et cetera. I just wanted to make sure, as I don't see... . The car is running a Maf Right? The car isn't on SD is it?

 

[4gfun]

Car is on a 1g MAS. Thanks....I have been able to get rid of my issue through tuning. I might be emailing you for further help as you offered.

My situation is a little bit weird since my xdf has 17 rows.

Looking over everything here and mods et cetera. I just wanted to make sure, as I don't see... . The car is running a Maf Right? The car isn't on SD is it?

Added the MAFS value and did another run...(attached) for some reason I couldn't get IDC.

Emailing you as well.

 

[MY1GDSM]

Ditch the 1g Maf as that is one more problem to take out of the equation.

a 2g/3g/Montero/Evo Maf all would work fine.

From most logs of seen anymore a lot of the 1g mafs signals really like to start breaking up at just getting slightly into boost(I've posted a couple sceenshoots of this happening on here before). Not to mention the last and newest 1g Maf rolled off the production line on a car almost 20 years ago now.

Anyway, I'd have to take a look again at the log but IIRC right before your pull in the log where you started to knock it looked like airflow dropped a lot.

Either way I'd need a bit more info (As I said in my Email) To say anything for sure at this point.

Edit grabbed a bit to look at in the CVS you posted. Maybe you where lifting off an the logging rate is slow. but it's something to take note of... .

FYI if the maf hz is setup to log at half the value 2338hz would be pretty far to take a 1g maf...

15.00º,13.34V,100.00%,1169.94Hz,5812.50rpm,0,19.20ms
16.00º,13.56V,100.00%,654.16Hz,6062.50rpm,17,9.73ms
23.00º,13.78V,100.00%,465.46Hz,6093.75rpm,17,11.01ms