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    I have a chip in the car. The IAT is not used. ...

    I have a chip in the car. The IAT is not used. Tuner hard coded the temp to 71 degrees. I checked with him and he said didn't sound like a tuning issue to him and lack of the temp sensor is not...
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    1984 Grand National - Cold weather issue

    I've got an 84 Grand National, converted to 87 ECU and using an LT-1 MAF with Translator.


    For a few years now I have had an odd problem that shows itself in cold weather. When the outside temp...
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    I've logged the data from the ECM and the RPM,...

    I've logged the data from the ECM and the RPM, TPS, AFR, etc all seem believable.

    Yesterday I threw a bottle of Royal Purple Octane booster in the tank. This stuff claims to raise the octane 30...
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    Spark Knock (One Cylinder only)

    I have a 2.7 liter 4 banger with TBI injection.
    The last few times I've driven I've encountered spark knock when in 4th gear under load. This is a new problem that I have not encountered previously....
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    Fuel Pressure Regulator

    On a TBI, when a Regulator starts to fail, can it fail and result in HIGH fuel pressure, or is it more likely to fail like the fuel pump and result in LOW pressure?
    Any other obvious symptoms which...
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    Thanks Makes sense. How would you diagnosis a...

    Thanks Makes sense.
    How would you diagnosis a bad regulator?
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    Fuel Pressure question

    TBI Engine is running lean. I suspect a fuel problem. Already swapped out injectors with known good ones, no change.
    Measured pressure on the low side at 9, but it's steady.

    When pinching the...
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    Surface temp of the ECU

    What is normal for the outside surface temp of an ecu like the 7747? Do they get warm? Hot?
    I noticed the other day that mine is getting very hot. Normal or should I be concerned?
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    Bump for Monday. No 305 Crossfire guru's out...

    Bump for Monday. No 305 Crossfire guru's out there???
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    I bought the injectors as rebuilt. There was no...

    I bought the injectors as rebuilt. There was no mention of them being location specific. What was the flow rate of either of the crossfire injectors?
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    5.0 Liter TBI injector differences

    I had 4.3l (43#) injectors in my project engine, and it was hitting 100% duty cycle on the injectors so I decided to go up to ones from a 5.0 liter engine.

    I ended up ordering ones from 82/83...
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    Yup, understood. But my original question...

    Yup, understood. But my original question remains... for a given engine how much does the fuel play into, IF AT ALL to what AFR ratio makes max power (excluding any knock consideration)?? If a...
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    AFR for max power

    I seem to remember reading that Stoich for E10 Fuel is something like 14.3 rather than 14.7.

    Does blend of fuel have any implication for what AFR to target in PE mode for max power? For example,...
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    All the values you scanned WILL change while...

    All the values you scanned WILL change while driving, so saying the value changed from x to y while driving in your driveway isn't that helpful, as a change would be expected.
    As long as you aren't...
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    I dont think this is the solution to a lower flow...

    I dont think this is the solution to a lower flow rate. The 4 cylinder cars used only a Single Injector but it was good for around 60 lbs/hr
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    How long would the choke tables be in effect? I...

    How long would the choke tables be in effect? I thought they applied just for a few seconds. (like less than 10). I'm rich for a few minutes until the coolant temp comes up. A few minutes, not...
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    Yes, I have that table. I am happy with the...

    Yes, I have that table. I am happy with the values in that table.
    The issue is that the actual AFR is richer than what the table says it should be.
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    TBI rich at start up

    I've been working on my VE fuel tables over the last month and am getting the Commanded AFR to match the Actual AFR pretty closely when driving and also at warm idle. But when I first start up...
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    Isn't their a value for Maximum Spark Advance? ...

    Isn't their a value for Maximum Spark Advance? If you've added 50 of initial timing, plus whatever else is added, then perhaps you are hitting the max timing and PE won't add any more ???? Maybe...
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    I know its been over a year since this thread was...

    I know its been over a year since this thread was started, but the thread just stopped without any conculsion.
    I'm wondering if you guys have any advice for me. I am using EBL to tune a 4 cylinder...
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    Update. I adjusted the throttle blade screw and...

    Update. I adjusted the throttle blade screw and the IAC to get the counts down. Doing this brought my IAC value at idle down from in the 60's down to around 15. This made a world of difference. ...
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    I'll give this a try. Thanks.

    I'll give this a try. Thanks.
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    The problem occurs throttle off, clutch in. ...

    The problem occurs throttle off, clutch in. Throttle off, coasting does not present any problems, until clutch is pushed in.

    Yes... There are multiple spark tables. SA- Initial, SA - Idle...
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    I am pretty sure I see in the data log that when...

    I am pretty sure I see in the data log that when the clutch is in and the engine starts to go below the idle RPM, the IAC is opening up, as it should based on the stall saver. Should I command the...
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    Did you solve the problem? I am seeing high IAC...

    Did you solve the problem? I am seeing high IAC counts in my car while idling and even higher when driving. Trying to understand when the throttle blades need to be cracked open more with the...
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