CDI 500 installed and car won't start

[sr20det]

Hi guy, Im new to this forum and have poor English Skill.

I have an Sr20 in my s14 with many mood to it, and im using SM4 right now, I just have the 500 installed as instructed in the Autronic book, after installed I try to start the engine and it seem like only one or two cylinder run, I test the spark it seem like it is weaker then stock. my ground is just a little longer then 6 inch. I even bybass the igniter and she still won't start. Can someone help me please.

Thanks

Andy

[MRMRacing]

So you had the engine running before you installed the CDI?

I even by bass the igniter and she still won't start
You should never use igniter's when using CDI, it can only be used directly to dumb coils without any electronics inside.

Have you wired the coils -Ve to corresponding coil +Ve ? coil 1 -Ve must be wired to same coil as coil 1 +Ve, coil 2 -ve to coil 2 +ve and so on.
Could you write how you have wired the CDI?

[sr20det]

Hi

I have follow the instruction in Autronic book, but i could not fine the -ve wire, I have poor skill with wiring, I can see that the CDI 500 is on, but she still won't run, and yes the car ran amazing seen i have the Autronic installed in there.

Andy

[sr20det]

Update.

I got her fire up and running now. It so much better then before, I used to gap my plug at .025 and now i had it gap at .035 and no misfire, throttle respond is there, during instalation i notice there is a trigger ground there that not hook up to anything, what is that wire for. Anyone know?

[MRMRacing]

You find this text in the manual "Trigger ground on the CDI is not used." Meaning it is not used with integration with Autronic ECU.

Are you sure your;
Coil 1 +Ve wire from CDI goes to same coil as coil 1&2 -Ve?
Coil 2 +Ve wire from CDI goes to same coil as coil 1&2 -Ve?
Coil 3 +Ve wire from CDI goes to same coil as coil 3&4 -Ve?
Coil 4 +Ve wire from CDI goes to same coil as coil 3&4 -Ve?

[Chris]

I believe you will find the trigger ground is used when the cdi is powered from a battery that is electrically isolated from the battery powering the ecu.

Chris

[sr20det]

Hi guy

Update

This morning when I came out and start her up, it was hard to start, and it stumple up and down after she start up, so I let her fully warm up and went for a drive, it felt like im losing power and she won't respond like before. Anyone might know what going on please help.


Andy

[MRMRacing]

You have not replied regarding the -Ve wires to coils I asked about.

[Drag_S14]

What coils are you running with the R500? I don't believe the factory coils are compatible with a CDI ignition. CBR coils fit pretty will into SR20 heads though :)