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Thread: Set IP Timing "Stock" or "Modified" ??

  1. #1
    Join Date
    Oct 2004
    Location
    Vancouver BC Canada
    Posts
    57

    Question Set IP Timing "Stock" or "Modified" ??

    Hello...

    I have been searching TDP for a while looking for help re IP and TDCO timing and have found much info but not the exact answer I am looking for.

    I have the GMTDBasic software and found: "Injector Timing Desired" is 8.7; "Injector Timing Measured" is 8.6 and the TCDO is -0.53. (Factory specs are: +3.5, +3.5 and -0.50.)

    My truck is completely stock with 208K miles but since I changed my IP (1.5 years ago), and had a GM diesel mechanic set the timing, my truck has never seemed to have the same top-end power, bottom-end seems fine. Could this be from the 8.7 and 8.6 timing?

    Should I set the timing to completely stock settings or should I leave the IJ timing set TDCO to the -1.94 that I see in TDP. If it should be changed I would purchase the GMTDScan software to do this.

    Above all though, I don't want to do anything too harsh for the ol' truck.

    Any help appreciated.

    Thanks,
    ol9465er
    1994 Chev 6.5TD Ext Cab 4X4
    Airhog AF
    OPS Relay
    New IP Oct 08 (4th)
    Remarq Sol D FSD (mounted as spare - used 3 times)
    214,000 Miles

  2. #2
    Join Date
    Jan 2005
    Location
    Denville,New Jersey
    Posts
    424

    Default

    I set mine to 1.94 about a year ago, and cant believe it's the same truck. If I was you I would get the GMTD scan software and try it yourself. Yes, maybe it does rattle quite a bit when its REAL cold out, but with the software you can dial it back to were you will feel more comfortable if you prefer. Some members of the ''Page''have dialed it back to 1.50 to avoid that ''marbles in a can '' sound when you start it cold, but not me, I am addicted to the improved throtle response. Have you had the truck since it was new? One member has stated that the timing chain can stretch in as little as 60 or 80 thousand miles and should be replaced to keep it from running like a slug. I hope this has answered your question. Get back to us and let us know what you decided.
    94 Chev Blazer, 6.5TD, 3.42, 4WD,Gear drive,,Remote FSD behind drivers headlight,,Mobil 1 in difs and trans,Rotella 30W, Over a quarter of a million miles !! Member -1.94 club.

  3. #3
    Join Date
    Oct 2004
    Location
    Vancouver BC Canada
    Posts
    57

    Default

    Thanks for the advice. Did you also have your IP timing set to something other than OEM at 3.5?
    ol9465er
    1994 Chev 6.5TD Ext Cab 4X4
    Airhog AF
    OPS Relay
    New IP Oct 08 (4th)
    Remarq Sol D FSD (mounted as spare - used 3 times)
    214,000 Miles

  4. #4
    Join Date
    Jan 2001
    Location
    New Hampshire - Live Free or Die
    Posts
    6,057

    Default

    Do the TDC offset learn and see what you get. If it's not close to -1.94, move the pump and repeat. Everything else will fall in place by itself.
    The Constitution needs to be re-read, not re-written!

    If you can't handle Dr. Seuss, how will you handle real life?

    Current oil burners: MB GLK250 BlueTEC, John Deere X758
    New ride: MB GLS450 - most stately
    Gone but not forgotten: '87 F350 7.3, '93 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6, '90 MB 350SDL, Kubota 7510

  5. #5
    Join Date
    Jan 2005
    Location
    Denville,New Jersey
    Posts
    424

    Default

    Yes, like John said if your current offset is .5 , then you would advance the pump timing a hair and check the offset again. If you are turning it in the right direction the offset will increase to say 1.25 rinse and repeat until you see the 1.94 float by. Setting the offset is the easy part, installing the software on your laptop is harder. Engh helped me through that.
    94 Chev Blazer, 6.5TD, 3.42, 4WD,Gear drive,,Remote FSD behind drivers headlight,,Mobil 1 in difs and trans,Rotella 30W, Over a quarter of a million miles !! Member -1.94 club.

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