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Old 04-23-2012, 10:21 PM   #1
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Default Got the car to start... but sounds like it's not running on all cylinders

So I finally got my naturally aspirated 92 running on my DIYPNP. I'm using the startup map from diyautotune. It needs a fair amount of throttle to keep it running, but it runs very rough, like its not running on all cylinders. We checked with a timing light and saw that all coils are firing, but I'm not sure if I'm actually getting spark in all of them. I pulled the plugs and cylinder 3 appeared glossier than the others.

I did notice that the dwell settings were different in the startup map from what's shown in the startup spreadsheet here: http://www.diyautotune.com/diypnp/ap...3-16b6-mt.html . I put the settings in the spreadsheet into the startup map. Should I use the original startup settings in the map as opposed to in the spreadsheet? They were quite different.

I put the stock ecu back in and it runs flawlessly. What should I look at next? I did set the trigger angle, but we ended up at only +3. Does that sound right?

I should add, that I don't hear the fuel pump prime when the ignition is turned on. i tried jumping FP and GND but it still ran rough.

Thanks for your input.
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Old 04-23-2012, 10:41 PM   #2
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datalogs and tune
Always datalog when you tune or make changes.
Always save a backup tune before making changes.
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Old 04-23-2012, 10:59 PM   #3
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Quote:
Originally Posted by Techsalvager View Post
datalogs and tune
Always datalog when you tune or make changes.
Always save a backup tune before making changes.
Will do. I need to establish a good workflow, tuning this is a lot different than on my other car.

I attached one log, showing me starting the car and giving it some gas to stabilize the RPMs. The engine was running very rough here. I noticed that O2 voltage was 0, until it went to .3 or so when I closed the throttle. Does 0v mean lean with narrowband sensors? I have req_fuel set at 11.2, as I am on the stock injectors.
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File Type: msl 2012-04-23_19.04.04.msl (109.6 KB, 52 views)
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Old 04-23-2012, 11:09 PM   #4
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yes lean, you want it around .47 or switching between that area.
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Old 04-23-2012, 11:11 PM   #5
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stock fuel injectors or 460cc's injectors?
nvm see now
hmm is this a N\a setup or F\I?
please upload your tune.
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Old 04-23-2012, 11:17 PM   #6
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Quote:
Originally Posted by Techsalvager View Post
stock fuel injectors or 460cc's injectors?
hmm is this a N\a setup or F\I?
please upload your tune.
Stock injectors and I'm still naturally aspirated. here's my tune.
Attached Files
File Type: msq 2012-04-23_20.59.52-rough running.msq (78.8 KB, 43 views)
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Old 04-23-2012, 11:22 PM   #7
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Update to ms2extra 3.2.1
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Old 04-23-2012, 11:33 PM   #8
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Quote:
Originally Posted by Techsalvager View Post
Update to ms2extra 3.2.1
I still need to flash the DIYPNP, but when I created a new project with the newer code, I got these warnings:


3 Warnings:
Warning: egoTarget not in current configuration. Value ignored.
Warning: Parameter in msq, but not valid for current firmware: No options found for Bit EcuParameter:spk_config_spka
Warning: MSQ Units Mismatch for EAElagRPMmax! rpm found in current configuration, rpms found in MSQ, values were not converted to new units.


Im not sure what to do about the last two errors. Am I ok to just load the older tune code and save it under the new code? Obviously, I need to change the firmware still.
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Old 04-24-2012, 11:38 PM   #9
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I updated to 3.2.1 and its still not working. I couldnt get it started for more than 2 secs tonight, but it was cooler out. I verified the injector wires are in place in the wiring harness. I'm not sure what to do next. There are four outputs on the DIYPNP for each INJ1 and INJ2, does it matter which is populated? Do I need an oscilliscope to see is the injectors are pulsing? my shitty multimeter did not move when i checked during cranking.

EDIT Log attached, this is with FP and GND jumpered, since I dont hear the fp priming when the key turns on.
Attached Files
File Type: msl 2012-04-24_22.08.01.msl (53.9 KB, 49 views)

Last edited by event; 04-25-2012 at 12:11 AM.
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Old 04-24-2012, 11:42 PM   #10
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datalog?
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Old 04-25-2012, 12:11 AM   #11
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Quote:
Originally Posted by Techsalvager View Post
datalog?
I added it to my above post.
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Old 04-25-2012, 08:54 PM   #12
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Heres another log with it running. I had to give it a bunch of extra fuel, but it still sounds like its not running on all cylinders. The tune is also attached. I'm not sure why this is being so difficult, I'm not even trying to run sequential fuel/spark

I pulled the plugs. Plug 1 and 2 are completely black, plug 3 is moderately fouled, and plug 4 is in OK shape. Piston 3 looks wet and piston 4 looks a little wet with some dry spots. I did add a lot of fuel to get the car to run better which explains why there are plugs that are completely black. What should I look at next?
Attached Files
File Type: msl 2012-04-25_18.37.49.msl (224.0 KB, 64 views)
File Type: msq 2012-04-25_18.53.35.msq (79.1 KB, 44 views)

Last edited by event; 04-25-2012 at 09:41 PM.
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Old 04-26-2012, 12:33 AM   #13
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made sure all coils are firing?
either you have one or two coil outputs not firing or one or two injectors not working correctly.
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Old 04-26-2012, 12:39 AM   #14
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Quote:
Originally Posted by Techsalvager View Post
made sure all coils are firing?
either you have one or two coil outputs not firing or one or two injectors not working correctly.
I checked with the inductive pickup on a timing light and it seems like each coil is at least firing, though I have yet to verify spark. I verified that INJ1 and INJ2 are each at 12V at the wiring harness with the car running. I think tomorrow I'm going to try new plugs and verify that they are indeed firing. Maybe I'm not getting a good spark with the startup map dwell settings.

I'm also assuming that I was running rather lean at one point, since I did start hearing knock at 1500 RPM or so.
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Old 04-26-2012, 12:51 AM   #15
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oh yeah narrowband was it?
did you make sure your timing is still correct after the fimrware upgrade?
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Old 04-26-2012, 11:12 AM   #16
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Quote:
Originally Posted by Techsalvager View Post
oh yeah narrowband was it?
did you make sure your timing is still correct after the fimrware upgrade?
Yes, just a narrowband for now. And no, I did not recheck the timing after the firmware upgrade. I'll check tonight, but I doubt that's my issue.
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Old 04-26-2012, 11:57 PM   #17
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Nobody has any insight? I'm stumped. I replaced the spark plugs and do have spark on each. With the 12V power supply, I did the output test and did see an injector pulse reading for each INJ1 and INJ2. Does this sound like a settings issue or a wiring/hardware issue? I'm about ready to throw this thing out the window...
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