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    Do you have any error codes stored? 7747 idle...

    Do you have any error codes stored? 7747 idle logic isn't as good as the later PCM's. On the 7427, if you don't have a VSS connected, it will do the same thing. You have to disable the error code for...
  2. Thread: low BLM

    by sturgillbd
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    Jumping the A & B aldl pins will not extend the...

    Jumping the A & B aldl pins will not extend the IAC pintle on the later PCM's . I just adjust the minimum air screw until it shows ~10 counts at hot idle. You may have to adjust the screw and the...
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    PM sent

    PM sent
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    SOTP = Seat of the pants .... Butt Dyno

    SOTP = Seat of the pants .... Butt Dyno
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    http://www.gearhead-efi.com/Fuel-Injection/showthr...

    http://www.gearhead-efi.com/Fuel-Injection/showthread.php?336-16168625-PCM-Information-E6
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    Make sure all pcm grounds are in place and clean....

    Make sure all pcm grounds are in place and clean. Make sure the ALDL connector ground pin is connected to a good ground such as the engine block. Also make sure your engine harness isn't positioned...
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    It could be a red/blue connector PCM like a...

    It could be a red/blue connector PCM like a 16197427 or it could be a vcm like the 16193495 which is flash based and has little to no support. If it is a red/blue PCM you can try an $E6 or or an $0D...
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    Has VATS been disabled in the OBD1 PCM?

    Has VATS been disabled in the OBD1 PCM?
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    My main reason for not getting a new efi setup is...

    My main reason for not getting a new efi setup is I have too much stuff gathering dust already. I have a Weiand Stealth ram also but hate to use it since I have a new in box TPI stand-alone harness I...
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    Yes on stock L31 heads not being compatible with...

    Yes on stock L31 heads not being compatible with the Howards cam mentioned above. The EQ heads already had screw in studs, I added a set of inexpensive roller rockers and used this kit to overcome...
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    Stock L31 or TPI?

    I ended up with a cracked head after 3 years on my vortec headed tbi in my Willys Jeep. Heads were a set of EQ CH350C's that were on a burned to a crisp L31 from a junkyard. Heads hadn't given any...
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    Here is a document that shows how the speed...

    Here is a document that shows how the speed sensor and drac connect to the ECM. There are diagrams in this document which tell what each pin is on the drac.

    Hope this helps.
    Brian
  13. The hang is caused by throttle follower. Look at...

    The hang is caused by throttle follower. Look at the parameters for that. If you lug these engines down in higher gears, you will also get a hang that is related to stall saver and it will not go...
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    Also EBL will not control a 4L60/80E..... Would...

    Also EBL will not control a 4L60/80E..... Would have to piggyback the EBL along with the 7427 to keep E-trans control. EBL supports boost. Pros and Cons with either choice.
  15. It appears to be open loop at idle. What is the 4...

    It appears to be open loop at idle. What is the 4 letter designation on the chip in the computer? Some of the early 7747's had open loop idle. You probably need to use a heated O2 sensor with this...
  16. Are you using E11 for your TCC? There are two...

    Are you using E11 for your TCC? There are two different TCC outputs on this PCM and it all depends on which Mask and transmission you use.
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    Yeah, I have the cooling fan patch and also made...

    Yeah, I have the cooling fan patch and also made my bin display calculated airflow in the datastream to play with O2 switchpoints. Attached are the XDF's and adx I use for $0D
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    ] You can try it and see if it works better for...

    ]
    You can try it and see if it works better for you. My base bin was BJYM. You can dowload that from here http://www.gearhead-efi.com/Fuel-Injection/attachment.php?attachmentid=392&d=1321320663

    ...
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    My open loop afr table is not stock. I had to...

    My open loop afr table is not stock. I had to enrichen some because I was too lean.. My tune isn't perfect but the last 400 mile round trip I made in my Jeep, I got 19.5 mpg running 60-65 mph on...
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    Here is my bin...

    Here is my bin...
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    I'll have to get it posted tomorrow. I don't have...

    I'll have to get it posted tomorrow. I don't have it on this machine. Will try to post it before I head to work in the morning.
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    Attached is the table with proper xdf... At 19 F...

    Attached is the table with proper xdf... At 19 F its -7 C. Your afr is commanding quite bit lower than stock either way. Interpolating the table, it is commanding 11.6 'ish afr and there are probably...
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    Look at your open loop afr vs temp vs vacuum...

    Look at your open loop afr vs temp vs vacuum table. You have your open loop afr quite a bit lower than stock. The screenshot in yellow is your bin.

    Edit: I see you have a 4L80. Are you using $31...
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    It is $8D mask. See...

    It is $8D mask. See http://www.gearhead-efi.com/Fuel-Injection/showthread.php?394-1227727-1227730-ECM-Information-8D. It will use the Moates G1 chip adapter. The 1227727 is the same as 1227730 in a...
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    We just grounded the P/N pin and it helped a lot....

    We just grounded the P/N pin and it helped a lot. With you having the 4l80, you can hook up the drac and send the signal to the ecm. Should be able to parallel the VSS signal from vss to the drac and...
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