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Thread: EEhack

  1. #16
    LT1 specialist steveo's Avatar
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    it's definititely the reason, i've checked your bin over several times and every other condition in your log seems to be met.

  2. #17
    Fuel Injected! Stroked 388's Avatar
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    Just checked o2 wire voltage that fine. The o2 test dead so I have to get a new set. If they were bad would it lock at 128 it should make BLMs higher or lower correct ?

  3. #18
    LT1 specialist steveo's Avatar
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    your blms are intialized at (by default) 128 then they're 'trimmed' based on measurements from closed loop, so if it's not going into closed loop, it'll be locked at 128.

    your ecm is smart enough to know that an o2 stuck at 450mv can't be reading correctly yet, so it's not entering closed loop. if you drove around for long enough, it would certainly set an o2 error code or something...

  4. #19
    Fuel Injected! Stroked 388's Avatar
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    That makes perfect sense Steve. I have not driven it it's winter here I just put in a new cam and was just going to tune it at idel till I can get it out on the road. I'm running stock o2 for not till I get the fueling better then switch to wide band o2s and find tune it. I will let you know if the o2 fix it. Thanks so much for the help. That's very nice and informative Gary

  5. #20
    LT1 specialist steveo's Avatar
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    no problemo.

    just fyi you can tune it very well using narrowbands with eehack's analyzer

    you really just need wideband to tune wide open throttle

  6. #21
    Fuel Injected! Stroked 388's Avatar
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    I will give it a shot. Your program has so much to offer can't wait till I can use all the awesome features it has to offer. I may need some help understanding some of it at some point. Lol Thanks again steveo :)

  7. #22
    Fuel Injected! Stroked 388's Avatar
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    Hey steveo got the new AC Delco o2s in BLMs are now active. One question is the don't seam to heat up very good with key on I checked for 12v to the o2 and it's present. Pull o2s back out to ohm the heater it reads 14 ohms on both should be only 5 to 7 ohms correct ?. Also I should not have constant 12v to heaters from what my manual tells me. 12v should only last 2 seconds from what the book tells me. It uses the AC relay for power for 2 seconds and deverts power back the AC compressor witch the AC system is deleted. Thanks Gary

  8. #23
    LT1 specialist steveo's Avatar
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    It uses the AC relay for power for 2 seconds and deverts power back the AC compressor witch the AC system is deleted. Thanks Gary
    im almost certain this is incorrect. i've never had an LT1 wired like that. the heaters should be powered from ignition power as far as i know, and always be on.

    don't worry too much about the heaters, if it gets warm in open air with the key on, it's fine. i've run without heated o2s too, just turned the closed loop timer way up so it had enough time to get hot from exhaust heat.

  9. #24
    Fuel Injected! Stroked 388's Avatar
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    I don't believe they are getting hot enough it does go in to close loop but the milavots are real low more do on the left side it stays around 200 to 250 when running for about 10 to 15 minutes. So it's giving me split blms

  10. #25
    Fuel Injected! Stroked 388's Avatar
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    Decided to go back to the basics fuel and spark. Pulled wires and OHMd them out at 200k on the meter #1 was 01.8 #3 02.1 #5 02.5 #7 was 55.9 way off from the rest pulled that plug it was black and wet so I need a new set of wires what kind do you recommend ? I'm guessing but it not firing would make the exhaust cooler on that side

  11. #26
    LT1 specialist steveo's Avatar
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    I need a new set of wires what kind do you recommend
    stock AC delco wires are fairly high quality, but with headers you might want a cut-to-fit set (msd makes one)

    I'm guessing but it not firing would make the exhaust cooler on that side
    closed loop hates dead cylinders. a non-firing cylinder pumps air, so that bank would probably read lean to an o2 sensor, which would typically make closed loop enrichen the other cylinders, so you have three rich cylinders and a dead one....

  12. #27
    Fuel Injected! Stroked 388's Avatar
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    I'll have to order the MSD cut to fit ones. I too think they would be better so I can route them away from the headers. I'll also get a new set of NGK plugs also. Thanks again for the help and information

  13. #28
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    Hey Steve got my new wires and plugs it fixed the split in my blms. Now both side are running at 160 witch is way high and the same with the INT both are at 193. The o2s look to be switching fine I tried to increase that map table at ideal but no luck. Any ideas what to look for or try ? Thanks Gary

  14. #29
    LT1 specialist steveo's Avatar
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    160 is max (in a stock bin) so that means closed loop is giving up.

    with your BLM and INT both maxed out, it's practically impossible that your O2s are switching properly. normally switching o2s are a result of closed loop operating properly, and closed loop really can't operate at its maximum trim thresholds

    with trims like that i'd either expect a constant to be way out (injector size or something), a severely misfiring cylinder or two, big vacuum leak, something like that.

    show us another log?

  15. #30
    Fuel Injected! Stroked 388's Avatar
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    i have uploaded a zip file with the tune and the newest log. i will look to make sure the wires are rite but it don't seam to have miss and revs good. i looked at any vac hoses and tested for vac leaks all looks good. I did notice that if i increase the rpms the blms will drop don't know if that means anything or not was just a observation. There are some differences in tune bin constants than what information i have like cylinder vol. inj. pulse width ect. i can send any information to you if you would like (mods parts ect). I'm at a loss been trying to figure it out for the last year and had no progress. i'm just glad i was able to find your program and yourself to take the time to help. Thanks again Steve

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