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Thread: Oil temp measuring

  1. #46
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    Sorry guys, I'd be more active, but some filter on the work system has blocked me from accessing the site for more than a couple of minutes a day. Once/if that clears up I'll be back! Looking good so far. Guess I'm going to have to start researching the '730 AND '165 6E in regards to this, depending on how long it takes me to swap.

  2. #47
    Fuel Injected! PJG1173's Avatar
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    Quote Originally Posted by EagleMark View Post
    I wish I took the electronics course in high school but that was before EFI so I thought a waste of time... that said you can feed 5 volts from wide band O2 sensor in and use it, so would that answer the question?
    yeah back then the vacuum tubes kept breaking when you hit a bump so efi wasn't possible right? Seriously though I took 2 years of electricity and electronics in vocational school and this is still fussy to me. guess thats what I get for learning something that I didn't really use for 20 years
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
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  3. #48
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    I like this idea, especially since I dont need the trans temp pin for the stupid 4l60e I yanked out!
    80 Camaro Z28 - 550hp AFR 383 / T56 6spd (Holley HP EFI)
    91 Beretta "SS" - 260hp 3400 MPFI / HM282 5spd (7730/$A1) sold! for crazy money...but I miss it
    94 Silverado Z71 - 300hp Vortec 357 TBI / NV4500 5spd (7427/$0D) gone but not forgotten
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    01 Silverado 2500HD - stock Vortec 8.1 / ZF6 6spd (0411/8322)
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  4. #49
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    Quote Originally Posted by PJG1173 View Post
    yeah back then the vacuum tubes kept breaking when you hit a bump so efi wasn't possible right?
    That one's got to sting........ LOL

    TOM
    1994 3500 Dually , 502 (509) , 264HR , Edelbrock MPFI , PFI '7427
    1992 S-10 434 SBC/Tremec - '7427
    1986 Monte Carlo SS
    1984 S-10 , SAS, 496/700R4/205 , D44/14BFF -'7427
    1980 Z-28 496/700R4
    1979 Corvette 496/700R4
    1977 Olds 98 Regency 403/700R4

  5. #50
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    Quote Originally Posted by Nasty-Z View Post
    That one's got to sting........ LOL

    TOM
    Well a couple years before gaduation (time I was in auto shop) the TV repair man came to the house and put one in our TV...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  6. #51
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    Did a bit more research. Corvette's used an oil temp setup on the 1227727 (weather resistant '730).

    Sensor is here: http://www.ecklerscorvette.com/corve...1990-1996.html 1/4" threads. Three wire. I saw some talk of the Vette's that era having a gauge (makes sense w/ 3 wires), and since there is code in the '727 for it, obviously was used. A bit pricey with other options out there, I think Mark has the best solution yet. I suppose this one may allow rethreading down to 1/8"? No reason to use it vs. what Mark used I can think of, unless you just can't mount it in the drain plug location.

    Post here on oil temp sensor: http://www.thirdgen.org/techboard/di...re-sensor.html

    Hac for '727 showing oil info http://www.diy-efi.org/gmecm/papers/anht_hac.pdf

    Some talk here as well, http://www.thirdgen.org/techboard/di...-question.html Based on post #2, does that mean the correct sender should be a simply plug and play?

    This stuff is beyond me for the most part. Anything valuable in any of that?

  7. #52
    RIP EagleMark's Avatar
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    I'll look at that other stuff later but wanted to mention 1994 to 1997 up LT1 Corvette also used Oil Temp sender and has same PCM as Camaro Impala Buick and Caddilac with LT1 that does not use oil temp sender. So there may be another sender to look into and the PCM on those cars actually have the spot in bin and adx for it already!

    The 1227727 corvette you mention is earleier then LT1 I mention so probably 1992 and 1993 LT1 corvette had it as well.

    Would have to be pretty cheap to match the 3 wire CTS I used with half hour work. But you say they are smaller for other spots and without work to rethread...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  8. #53
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    Interesting, unless I'm doing something wrong, I can't find reference to the oil temp stuff in any of the bins available, using TP4 or 5. This includes ANHT shown in the Hac above, which clearly DOES have the oil stuff in it.

    I also checked out the ADS for the turbo 3100 motor, no mention of it there. Code 62 is listed, but for transmission. No ADS I've found for the Y-body '727 setups.

    Edit: It's a bit buried in Super_8dm2.ecu but the trouble codes for oil temp are there (not that I understand how they've done the codes in that one), I'm assuming that there is more work to have it seen/read via ALDL though.
    Last edited by dyeager535; 03-17-2012 at 06:52 AM.

  9. #54
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    oil temp is just a simple A/D read, then normalization, then store to RAM for either usage or just monitoring.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  10. #55
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    I found it in $DA3.ads/adx it is on pin C15, which is the LT1 for 1993 ECM looks simalar to 1227730 and the ALDL says
    " 26 ADOILTMP A/D RESULT FOR OIL TEMPERATURE SENSOR INPUT
    SEE OIL TEMP. LOOK-UP TABLE (NON-DEFAULTED)"
    It has one wire from ECM to sensor, one to ground and other to gauge. Just like the 3 wire coolant temp sensor.

    So the ADX file needs a lookup table which is already built, it has 256 counts and each one has a degree in F or C. You'd need to find the ECM/PCM your going to use.Find an extra pin or one not being used. Do a hac in TP on bin for one of the ALDL outputs to put it in data stream and then build a value in ADX.

    For me it was easy as I have a tranny temp pin not being used on 16197427...

    So what ECM are you going to use and we can start figuring it out?

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  11. #56
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    actually, the 92-93 LT1 PCM looks similar to the 1227727, however, it's actually a P6 unit, not a P4.

    EDIT: actually. and yes, i am nerd, hear me type.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  12. #57
    RIP EagleMark's Avatar
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    So it looks like the old ECM but it's really like the newer LT1 underhood ECM/PCM? I get the 27 30 mixed up in my non nerd head! When I looked at wiring I knew it was differant though. Some of the wiring diagrams we have are all pins even unused and some are only the used pins which makes it hard to see what is left over to track down.

    Point was the info is there and in later LT1. Just need to find an extra pin or in my case pin not being used and do the ADX work.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  13. #58
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    closer to the later PCM than the 7727. it's a P6, the 94-95 is a P66.

    but that's just trivia at this point. it may not be as simple as hooking up the pin and modding the ADX, it may be necessary to impliment a small patch to force the ECM to read that specific A/D channel, assuming you can find an open one.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  14. #59
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    Quote Originally Posted by EagleMark View Post
    So what ECM are you going to use and we can start figuring it out?
    Was that directed at me? Apparently I'm missing the thread update emails in my inbox.

    In any case, I think I'm going to end up going to the '727. I can't fit the '730 or '727 in the stock ECM holder for the trucks ('165 and '747 have the connectors on the end of the case still, so the stock truck holder worked), I think the '727 makes more sense. Just mount it underhood. It looks to be pretty darn water resistant, more than I expected. Still have to get my hands on a couple. Then I'll have to deal with trying to hook the autoprom to it!

    Mark, you get anywhere on hooking your oil temp setup up? Curious how that works. I got a TBI wiring harness for my car, depending on which ECM I decide for that application oil temp reading for that would be handy as well. It's a tough setup to cool.

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    if you have the connectors hooked up and all fasteners properly tightened and all weatherseals in place, you can actually dunk a 7727 in water while powered on and nothing bad will happen. not that i recommend trying this, but they are watertight.

    also: the 7727 has a BUNCH of unused A/D channels even in stock configuration.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


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