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Old 11-14-2010, 10:49 PM   #1
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Default Injector PW cycles on-off

Im running MS-II v3.0 relay box EDIS and ITBs. Car has been running good until today. The injector PW dies and reads 0.0 every 2-3 seconds and it cycles constantly causing the rpm to oscillate. I didnt do anything out of the ordinary. I tried putting the same value in all the cells on the VE table to stabilize the idle but the injector PW cycles on its own. Ive attached a datalog and my msq
Im very confused. TIA
Attached Files
File Type: msl datalog.msl (300.1 KB, 46 views)
File Type: msq datalogtune.msq (78.7 KB, 62 views)
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Old 11-14-2010, 11:09 PM   #2
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Without looking at your log yet, I'm gonna guess it's your overrun fuel cut settings. That's the only thing I know of that'll cut PW to 0.
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Old 11-14-2010, 11:25 PM   #3
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This happens during idle and the PW cycle 0-VE based PW and the cycle is 2-3 seconds. As a result, rpm and AFR oscillate constantly at idle speed.
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Old 11-14-2010, 11:43 PM   #4
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I had a problem where overrun fuel cut would activate during a high idle (esp during warmup) and it would cause all of the symptoms and would prevent closed loop idle from working, and RPM would bounce over and over. I don't know of anything else that cuts fuel during running conditions. Did you change your settings or disable overrun fuel cut?
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Old 11-15-2010, 12:01 AM   #5
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I did not change any of the settings on purpose but would a dead battery corrupt the msq or the firmware?
I went ahead and turned off over run fuel cut for now and that helped eliminat the oscillating.
It has never done that before.
Thanks for the help!
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Old 11-15-2010, 12:28 AM   #6
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Your overrun fuel cut settings are way too aggressive. It's triggering fuel cut while idling. You need to move the kPa and tps values down. Here's the info:
http://www.msextra.com/doc/ms2extra/...rsion.htm#orun
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Old 11-15-2010, 12:43 AM   #7
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how is over run fuel cutoff related to decel fuel amount value?
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Old 11-15-2010, 04:22 AM   #8
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It's not. Overrun fuel cut is strictly for conditions where the engine rpm is dropping and there is no throttle input -- such as when coasting to a stop. It's strictly a fuel economy thing.

Decel fuel amount is under your acceleration enrichment settings. Raise your TPS%/s and kPa/s to really high values (like 500) and see if that eliminates your problem. You might be adding in unintended AE with small changes in MAP and that will throw off your AFR and idle. AE info here: http://www.msextra.com/doc/ms2extra/...ual.html#accel
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Old 11-15-2010, 11:26 AM   #9
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Car was fine until the battery died. Did the dead battery cause the settings to get corrupted?
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Old 11-19-2010, 02:57 AM   #10
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Battery won't cause it to lose settings. Why'd the battery die? If your alternator wasn't working and everything was off the battery, well, a near dead battery will screw up your injector PW, making the car run like ***. Did you check to see that your AE settings weren't the issue?
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