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proxlamus©

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    How to wire up your LC1 to Megasquirt

    in MegaSquirt

    Posted

    From DIYautotune.com

     

    How should I wire up my Innovate LC-1?

    For the most part you'll follow the 'Quick Start Guide' that comes with the LC-1 to the letter. If you lost that or need a copy of it for some reason you can download it here: LC-1 Quick Start Guide for the LC-1 or here: LC-1/XD-1 Standalone Gauge Kit if you have the combo kit.

     

    Here are the two things you'll want to cover that AREN'T mentioned in the QuickStart guide:

     

    * Ground the LC-1 and the MegaSquirt together. This is to prevent a voltage differential and will ensure accurate readings.

    * THIS STEP IS ONLY ON LC-1'S IN THE YELLOW/BEIGE BOXES, NOT THE BLUEBOX LC-1'S: Use a 470 ohm, 1/4watt resistor in between the analog output of the LC-1, and the o2 input of the MegaSquirt. So you'll wire the analog output from the LC-1 to one side of the resistor, and then you'll wire the MegaSquirt 02 input to the other side of the resistor, forcing the signal to pass through it.

    o Blue Box LC-1's (started shipping around mid-June '06) have an updated DAC that does not require the 470 ohm resistor when used with MegaSquirt. Another way to identify if you have an LC-1 with the updated DAC is the serial number for the LC-1s with the DAC update are LC11188 and above and all LC-1s with a serial number that start with CLC.

     

    RadioShack link for 470ohm 1k resistors

    LC 1 widband

    in MegaSquirt

    Posted

    on this note..

     

    I am trying to hook up the Innovate LC1 to the Megasquirt unit...

     

    If i hook up the wiring directly MS reads the proper AFR according to my guage..

     

    but I am supposed to install an in-line 1/4watt 1k resistor?!

     

    Well with the resistor inline.. Its all screwy and the readings are WAY off

     

     

    ** EDIT - ahh.. i need a 1/4 watt 470 ohm! not 1k!

    HELP HELP! no spark!

    in MegaSquirt

    Posted

    Well... its 21* F outside right now.. car is buried in 5 inches of snow and a wind chill of 2* F...

     

    I went to Advance Auto and had them test my HEI units...

     

    One was bad.. the other was on/off..

     

    I grabbed a new one.. and hooked it up.

     

    After some reading I found out the base of the GM HEI needs to be grounded to a heat sync or metal... I sanded down the heat sync... added some di-electric grease... and hooked it all up.

     

    Problem solved.. bad GM HEI unit.. I shorted the other out...

     

    Cause? improper grounding of the base of the HEI unit.. YES all connections were correct, but it was all due to a corroded heat sync and improper grounding of the base of the HEI.

    HELP HELP! no spark!

    in MegaSquirt

    Posted

    Ok ..

     

    I tested the HEI... wtf its brand new...

     

    I did the following

     

    + has "B" and 12v connected

    - has "C",

    "W" is ground,

    "G" is FIDLE

    I left out the condenser.. this is ok right?

     

    I then used a wire and connected it to the "G" terminal of the HEI unit. I then pressed it against the + side of the coil...

     

    Nothing.. No spark.. nada

     

    So why all of a sudden did this NEW HEI go bad?

     

    Now what?

    HELP HELP! no spark!

    in MegaSquirt

    Posted

    Ok.. I guess the neg and pos reads 12v untill the GM HEI tells the coil to fire...

     

    then the negative collapses and turns to ZERO..

     

     

    another thing.. I used a volt meter and hooked it up to the TACH on the relay board (dizzy input)

     

    I have a reading of ZERO volts... on the TACH input..

     

    does this mean I am not getting a dizzy signal?!

    HELP HELP! no spark!

    in MegaSquirt

    Posted

    OK.. I bypassed that "coil resistor to be safe... no luck...

     

    I am checking the voltage on the coil terminals..

     

    I am getting 12v at the POS and 12v at the NEG!

     

    whoa..I should not be receiving a 12v source at the negative terminal should I?

    HHHEELLPPP!! No spark!!! traced everything

    in Trouble Shooting / General Engine

    Posted

    Specs - Megasquirt n Spark 2.2pcb 021u code. 83 dizzy, GM HEI and stock igniton coil.

     

    Ok.. I was driving down the road.. and all of a sudden the car died.

     

    I pulled into a neighboorhood and began some tests.. I have fuel pressure.. the plugs are wet so it is spraying fuel.

     

    I pulled the spark plugs.. NO spark.

     

    I pulled the spark electrode wire out of the coil.. and since I had no multimeter I cranked it and held onto the electrode, I definatly got one hell of a shock. I assumed it was a cap/rotor. So i replaced the cap and rotor... and no spark!

     

    Hmm.. I tested the coil again and there was no spark and no shock ;)

     

    Now to source it down... the coil is an original 1978 coil, So i replaced it with a MSD Blaster 2 coil. Car fired right up, drove it home, died in my driveway. No longer ran, and would no start.

     

    I am assuming it was the GM HEI setup, so I put in a NEW GM HEI module.. still no start.

     

    The problem is, I am not getting any spark out of the coil.. and is not sending any spark to the dizzy.

     

    My only other assumption is the DIZZY is bad.. and is not sending a signal to Megasquirt. So I measured the voltage on the GM HEI to see what was going on.

     

    1722510440.jpg

     

     

    (INCLUDED IS A DIAGRAM TO HELP)

    B (goes to + of the coil) = 12v

    C (goes to the - of the coil) = 12v

    W (GM HEI ground) = 0v (obviously its a ground)

    G (attaches to Megasquirt) >>>

    [ 1)On initial turn key to ACC, the fuel pump primes, and the voltage is 12v for a few seconds. I am assuming MS is sending an signal to the GM HEI which is why I can sense voltage.

    2) In addition I can read 12v while cranking at this terminal.

    3) The voltage reads ZERO (0 volts) when the key is on ACC and the ignition is live, untill I crank.]

     

    Now.. I have NOT read the voltage from the dizzy to megasquirt since I am getting postive voltage from MS to the GM unit (if the dizzy is bad will this still show a reading?!)

     

     

    The coil reads 12v and is getting power.

     

    Could this be a problem with 1) Megasquirt? 2) DIZZY 3)coil wiring ??

    HELP HELP! no spark!

    in MegaSquirt

    Posted

    Specs - Megasquirt n Spark 2.2pcb 021u code. 83 dizzy, GM HEI and stock igniton coil.

     

    Ok.. I was driving down the road.. and all of a sudden the car died.

     

    I pulled into a neighboorhood and began some tests.. I have fuel pressure.. the plugs are wet so it is spraying fuel.

     

    I pulled the spark plugs.. NO spark.

     

    I pulled the spark electrode wire out of the coil.. and since I had no multimeter I cranked it and held onto the electrode, I definatly got one hell of a shock. I assumed it was a cap/rotor. So i replaced the cap and rotor... and no spark!

     

    Hmm.. I tested the coil again and there was no spark and no shock ;)

     

    Now to source it down... the coil is an original 1978 coil, So i replaced it with a MSD Blaster 2 coil. Car fired right up, drove it home, died in my driveway. No longer ran, and would no start.

     

    I am assuming it was the GM HEI setup, so I put in a NEW GM HEI module.. still no start.

     

    The problem is, I am not getting any spark out of the coil.. and is not sending any spark to the dizzy.

     

    My only other assumption is the DIZZY is bad.. and is not sending a signal to Megasquirt. So I measured the voltage on the GM HEI to see what was going on.

     

    1722510440.jpg

     

     

    (INCLUDED IS A DIAGRAM TO HELP)

    B (goes to + of the coil) = 12v

    C (goes to the - of the coil) = 12v

    W (GM HEI ground) = 0v (obviously its a ground)

    G (attaches to Megasquirt) >>>

    [ 1)On initial turn key to ACC, the fuel pump primes, and the voltage is 12v for a few seconds. I am assuming MS is sending an signal to the GM HEI which is why I can sense voltage.

    2) In addition I can read 12v while cranking at this terminal.

    3) The voltage reads ZERO (0 volts) when the key is on ACC and the ignition is live, untill I crank.]

     

    Now.. I have NOT read the voltage from the dizzy to megasquirt since I am getting postive voltage from MS to the GM unit (if the dizzy is bad will this still show a reading?!)

     

     

    The coil reads 12v and is getting power.

     

    Could this be a problem with 1) Megasquirt? 2) DIZZY 3)coil wiring ??

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