Fuel trims LTFT Low, Mid not adjusting now?
Sep 22, 2009, 09:26 PM
#1
Fuel trims LTFT Low, Mid not adjusting now?
Having a problem getting my fuel trims to log in evoscan now. The STFT and O2 feedback are working properly, but the LTFT Low, & Mid are not moving. I have loaded the OEM fuel map inplace of my fuel maps with OEM scaling also and still getting nothing. I have also tried Mitsulogger and I am getting the same results. You guys have any suggestions as to why the trims aren't moving now? FYI the last time I logged the trims was about a year ago when i installed the FIC 750s before my cam install. Ever since then I have not been able to get the fuel trims to log... Do I need to put the OEM timing map and scaling back in also to log trims? I do have an VIII and I have disconnected my battery to reset the trims also...
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Sep 23, 2009, 08:12 PM
#8
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You really need to do some scaling....injectors and MAF. You want the trims to be +/- 5%
That e85 is tricky to get dialed in. I read somewhere that you need 30% less injector scaling to get it dialed.
Search on here for E85 tuning.
That e85 is tricky to get dialed in. I read somewhere that you need 30% less injector scaling to get it dialed.
Search on here for E85 tuning.
Sep 24, 2009, 07:22 AM
#9
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I know, my car was tuned by the previous owner by a shop. I've been having cold start issues and my trims were like this from that tune. I've been making scaling and latencie changes and it starts and runs better but my trims are't coming down like I would like to see. well atleast the low the other two won't adjust at all according to evoscan
Sep 24, 2009, 07:27 AM
#10
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do you think I need to rescale my maf? I'm on the stock box with a bmc filter but I do have a ralliart hard intake pipe. all of the settings are still the same as stock.
Sep 24, 2009, 09:54 AM
#12
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The MAF sounds ok.....I believe your fuel scalings are too much. The ECU only has a 25 point adjustment for the LTFTs. If you are too far scaled out, the ECU won't be able to compensate.
Sep 24, 2009, 07:26 PM
#14
Okay update... I changed my oil and tranny fluid yesterday, and did a boost leak test, and forgot to hook up the MAF after which threw a code. I cleared the code which resets the fuel trims on an VIII and now the car is idling at 36-41hz , afrs at idle are still hovering from 14.6-15.0 but still wont log the fuel trims... the only thing that seems wierd is at certain cruise situations my AFRs will dip to about 12.5-13 at certain rpms/ still in vaccum like it is transitioning to open loop with slight variations in TPS. I need to log this data as I just noticed it last night on an hour long trip... WOT is spot on 11.5/6 tapering to 11.1/2 at redline.
