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  1. Replies
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    I did the tpi conversion on a 95 with the help of...

    I did the tpi conversion on a 95 with the help of fast355, dave, haulina$$, and a few others. I wrote up just about everything at:
    https://www.gmt400.com/threads/tbi-to-tpi-conversion-mpfi.39486/...
  2. Thread: Nasty misfire

    by pro
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    1,824

    Nasty misfire

    Attached are the log/definition/bin files from an idle and 12 foot drive into my garage. It misfires pretty bad and almost dies when in drive and idling forward.
    Is it normal to see the spark...
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    Oh wow those crank BPW values are much smaller...

    Oh wow those crank BPW values are much smaller than even 8D TPI.
    And I assume that the BPW value in 0D is measured in milliseconds times 10, which I think is a centisecond. A value for example is...
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    According to google's conversion calculator, a...

    According to google's conversion calculator, a milisecond is 1000 microseconds (34.4 microseconds = 0.0344 miliseconds).
    Dave - yes I did the jumper wire on the memcal as the doc explained.
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    I see under Cranking Fuel Parameters, Crank BPW...

    I see under Cranking Fuel Parameters, Crank BPW vs Temperature. It looks like 4.3 CPI is anywhere from 20%-40% lower than stock BJYL. I can adjust this, although there are 9 other parameters.
    ...
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    Must use clear flood mode when starting

    I converted my truck (95 TBI 5.7) to TPI last summer but havent had much of a chance to work or drive it that much.
    But for some reason I am noticing that the times that I get a crank no start i...
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    5,862

    I'm using the factory AUJP bin in the camaro and...

    I'm using the factory AUJP bin in the camaro and decided I would put a few gallons of ethanol free gas in the tank just out of curiosity. I also wanted to see how it would log on tunerpro, since I...
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    Sweet thanks guys makes sense.

    Sweet thanks guys makes sense.
  9. Replies
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    Yes makes sense, thanks. So ethanol free gas...

    Yes makes sense, thanks. So ethanol free gas brings the AFR down 5 percent, which should also bring the trims down 5 percent as well?
    You said a 20 percent blend is 8% difference and 118 trim. But...
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    Can ethanol free gas cause a rich condition?

    I drained the tank on the 92 camaro, added several gallons of ethanol free gas, and finally got tunerpro to log for me (the log is attached). BLM is pegged at 108 the entire time, and INT usually...
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    Would you also recommend lowering the values in...

    Would you also recommend lowering the values in the VE table (I suppose it's idle VE vs MAP vs RPM)?
    In looking at more data, in most of the cases where BLM was at 110 and near 105, MAP was around...
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    Thanks. 105-110 is low enough to worry about? I...

    Thanks. 105-110 is low enough to worry about?
    I don't know if it matters, but the EGR is disabled.
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    First drive - TPI truck

    It seems to drive fairly well. I logged data to my tablet as a drove around for about 5 minutes, then just looked over the CSV tonight out of curiosity. I dont have anything to diagnose, but I...
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    Nevermind - my euless bro was correct, there were...

    Nevermind - my euless bro was correct, there were 2 issues - vacuum at the back plenum, and i forgot about how the LT1 throttle body IAC passages sit flat to the TPI plenum and have to be cut to fit....
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    If there is a 500rpm difference between TBI and...

    If there is a 500rpm difference between TBI and MPFI chips, then there must be an issue in programming as well?
    I have an ebay adaptor for the IAC wiring. It just converts the TBI connector to the...
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    It's starting up now. There may be some broken...

    It's starting up now. There may be some broken wires somewhere to the injectors. At any rate, it started up immediately but then also quickly made its way up up and away to 2000rpm before I killed...
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    I did and it had good spark. Today I also took...

    I did and it had good spark. Today I also took the fuel rail off over to the bench and hooked my injector tester up to each one, and they all opened up and flowed fine.
    I put it all back together a...
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    It may have pointed to 3 before back when I had...

    It may have pointed to 3 before back when I had to take the intake off to clean the EGR ports out. Either way, does it not hurt to just move the distrib housing to compensate? Thats what I did then....
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    I have already tried the stock computer. I took...

    I have already tried the stock computer.
    I took the distributor back out. With the timing mark at 0, the rotor is pointing at cyl 3. It was not this way before first crank with the TPI intake on...
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    I had thought about this as well. But rarely does...

    I had thought about this as well. But rarely does the timing light light up on any spark plug wire. It does every time on the short coil wire though. The spark tester gives me spark on the spark plug...
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    No start TBI/TPI truck

    I did a TBI to TPI conversion on a 95 5.7 this summer. I can crank, but no start. I have great spark to all plugs as well as fuel to each cyl. PSI is 45 and none of the injectors are stuck open. Ill...
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    Does anyone know why I cannot put higher than...

    Does anyone know why I cannot put higher than 3800 in "usec Added" in the Injector PW Correct vs Battery Voltage table? I need 7782 for the TPI injectors on a couple of the rows. I am just using row...
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    I burned my first chip and ignored the adapter...

    I burned my first chip and ignored the adapter and just used a dip socket. The height of the chip and dip socket was perfect underneath the cover when snapped on, so I suppose no soldering will be...
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    Sorry, what i did was Read EPRom, 27C512, and...

    Sorry, what i did was Read EPRom, 27C512, and then save the bin. I just wanted to get my own baseline.
    Are you referring to these bins, post 3:...
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    i am still waiting on a harness and intake, so...

    i am still waiting on a harness and intake, so thought would get programming and the fuel pump out of the way.
    The chip is a BJYL, and i did an import via tunercat, saved to bin. I tried to import...
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