Misfire after FIC 1450 install
#1
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Misfire after FIC 1450 install
Well, I got my latencies dialed in. And my car is misfiring pretty much constantly in low load (cruise and idle)
If I get into boost the misfire goes away. What could be causing this?
Car is an 03
Mods are:
Exedy Twin
FIC 1450's
Kelford 272's
Helix 3" Downpipe
Greddy Ti-C cat back
3" testpipe
ETS 4" FMIC
Hallman MBC at 22 psi
Omni 4 bar MAP sensor
Walbro 255
Apex'i Turbo Timer
Innovate LC1 wideband
The car didn't misfire with my stock injectors, but as soon as I installed these, it sputters like crazy.
I've changed plugs, and it didnt help.
I also just filled up with my first tank of e85 in hopes that it was just to large of an injector on 91. But, to no avail, it still misfires.
I read somewhere Appauldd had this issue too, I pm'd him on what he changed but he hasnt gotten back to me.
So i'm asking the tuning community as a whole, what steps would you take to track down this issue?
My scaling now on 91 is:1329
e85:1170
Latencies:
2.784
2.122
1.680
1.296
1.104
0.984
0.816
Any help is appreciated.
If I get into boost the misfire goes away. What could be causing this?
Car is an 03
Mods are:
Exedy Twin
FIC 1450's
Kelford 272's
Helix 3" Downpipe
Greddy Ti-C cat back
3" testpipe
ETS 4" FMIC
Hallman MBC at 22 psi
Omni 4 bar MAP sensor
Walbro 255
Apex'i Turbo Timer
Innovate LC1 wideband
The car didn't misfire with my stock injectors, but as soon as I installed these, it sputters like crazy.
I've changed plugs, and it didnt help.
I also just filled up with my first tank of e85 in hopes that it was just to large of an injector on 91. But, to no avail, it still misfires.
I read somewhere Appauldd had this issue too, I pm'd him on what he changed but he hasnt gotten back to me.
So i'm asking the tuning community as a whole, what steps would you take to track down this issue?
My scaling now on 91 is:1329
e85:1170
Latencies:
2.784
2.122
1.680
1.296
1.104
0.984
0.816
Any help is appreciated.
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#11
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iTrader: (7)
Thats a large injector set for your setup.
First, make sure you have drained all the e85 outand replaced with 91-93.
Log your STFT/02 feedback, low and mid trims (LTFT), tps, ipw, idc, Air Flow HZ, 1 byte load, AFR MAP, WB02, RPM, timing, MAP sensor, batt voltage, coolant temp, air temp, and the kitchen sink.
Idle for a bit to get useful trim data on the logs. Start from a clean ECU with no trims if you can (unplug the battery for a bit). Cruise around making sure you create the problem toalso get data on the logs.
Basically you probably are way rich and the ECU is taking away fuel at open loop, but can't compensate quick enough when needing to add fuel during tip in/throttle changes due to the off whack trims.
If you post logs, there should be some tuners out here that could easily point you in the right direction. Good luck man and happy new years.
EDIT: Just took a look at my previous roms with smaller injectors....your latencies seem pretty high for use with a EVO ECU. Please check your latencies and try again.
First, make sure you have drained all the e85 outand replaced with 91-93.
Log your STFT/02 feedback, low and mid trims (LTFT), tps, ipw, idc, Air Flow HZ, 1 byte load, AFR MAP, WB02, RPM, timing, MAP sensor, batt voltage, coolant temp, air temp, and the kitchen sink.
Idle for a bit to get useful trim data on the logs. Start from a clean ECU with no trims if you can (unplug the battery for a bit). Cruise around making sure you create the problem toalso get data on the logs.
Basically you probably are way rich and the ECU is taking away fuel at open loop, but can't compensate quick enough when needing to add fuel during tip in/throttle changes due to the off whack trims.
If you post logs, there should be some tuners out here that could easily point you in the right direction. Good luck man and happy new years.
EDIT: Just took a look at my previous roms with smaller injectors....your latencies seem pretty high for use with a EVO ECU. Please check your latencies and try again.
Last edited by evoredy; Dec 31, 2010 at 09:05 PM.
#12
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On my Injector Latency Data sheet for these injectors it says:
..........................................10 volt 12 volt 14 volt 16 volt
Opening response time (ms) 1.68 1.38 1.17 0.98
closing response time (ms) 0.99 1.00 1.01 1.02
If that helps any, I tried it at these settings and still was getting that misfire I described, i'm going to dive back into it tomorrow and see if I can make any progress, it was driving a ton better on the way home tonight.
Still had misfires here and there, but definitely a lot smoother. I didnt change anything either, so idk
..........................................10 volt 12 volt 14 volt 16 volt
Opening response time (ms) 1.68 1.38 1.17 0.98
closing response time (ms) 0.99 1.00 1.01 1.02
If that helps any, I tried it at these settings and still was getting that misfire I described, i'm going to dive back into it tomorrow and see if I can make any progress, it was driving a ton better on the way home tonight.
Still had misfires here and there, but definitely a lot smoother. I didnt change anything either, so idk
Last edited by b16a95eg; Jan 1, 2011 at 01:24 AM.
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