Ignition Coil Relay Cont'd

[Zushi]

My engine block, head and throttle body have good grounds. None of my cylinders are sparking though. When I tested the second cylinder I got schocked...i might have been touching the block...but it was only on the second cylinder that happened(when i took the plug and coil pack out to look for spark). Do I have a bad ground? Or what...not sure. help me out. Thanks.

[boost_boy]

SOmething on your car is not grounded properly! Too bad you're not closer as I could solve your mystery with a bit of investigative work. I know you're frustrated bro, but you got to locate where your grounding issue is. When you turn the key on, can you call up the trouble codes on the ecu? Take loose a coil from the head, stick a spark plug in the coil's red boot, place it close to the chasis of the car or a good ground source and have someone try and start the car. If the spark is there, but weak, then you have serious ground issues. Or if your battery isn't fully charged, forget about it cranking. Do you hear the fuel pump prime when you turn the key?

[DrftDmn]

Im having the same problem , NO spark at all, Im from florida , west coast, The car has injector pulse and Im almost 100% sure i have grounds in the right place , I have 12.6 volts to the positive part of the coil and a good ground , Good fuel pressure.... this is fristrating

[boost_boy]

Quote »Im having the same problem , NO spark at all, Im from florida , west coast, The car has injector pulse and Im almost 100% sure i have grounds in the right place , I have 12.6 volts to the positive part of the coil and a good ground , Good fuel pressure.... this is fristrating[/quote] Your ignition section is not getting ignition and this is more ecu related. If you are getting injector pulse, then spark should be around the corner somewhere. 1 little ground wire withing the harness has the ability to prevent your car from firing.

[Zushi]

hey, well my fuel pump does prime(high pitch noise from under the trunk...) and i noticed that i got voltage or something running through my chasis. i grabbed the body as i got out and had a good shock. i used a voltmeter on my chasis and it read off approx .5 volts. now i gotta find the bad ground..haha.. brb

[Zushi]

hey, do you happen to know any wires which should have approx .5 volts? think thatd help me find my bad ground?

[DrftDmn]

If you have power to the Chassis , you may have put a screw threw a power wire , I think it happens more than people think , Check your interior wires and dash.

[Zushi]

Hey, well I pulled an error code from my ecu when i turned the key on(not starting the car tho) and it read a code 12(afm). i was also looking for some grounds and i found that the l/r wire into my ignition coils is grounded. if im not mistaken, isn't this a power wire? Any easy ways of located a bad ground along this line? Thanks

[boost_boy]

I would take it your engine harness was molested before you owned it. If that's the case, then you're in for a hell of a ride.

[Zushi]

lol...i dont think the harness was messed with...when i got it it hadn't been cut or anything, i made the first cut when i cut off the plugs near the battery. unless the harness had been messed with and then retaped..but im not sure. so since my L/R is grounded...thats the one that has a bad ground right? i mean..is that wire supposed to be a ground? hrmmm

[Zushi]

Hey, I found that the L/R wire that is grounded..isn't grounded on my wiring harness.. its actually the Black/Red wire that I attached it to(like heavy throttle said to....connect blue/red and black/red to black/red...remmber?) The blue/red and black/red that i ran together are not grounded.. the Black/red on the US harness side is grounded. Doesn't this wire run up to the fuse box and what not? shouldn't be grounded im assuming.. i haven't found where my ground is exactly but i have at least found that its somewhere after the engine room harness(near battery wiring). know any common ground problems along this line? let me know.

[boost_boy]

*dee scratches his head and looks around at everyone else*

[Zushi]

is the blue/red wire supposed to be a ground? its actually the black/red wire that goes into the Ignition fuses and what not. maybe you could test your blue/red wire into your ignition coil to see if its grounded..............???

[boost_boy]

Maybe other members can answer this for you because I use a standalone system and all the 240's around here with CAs in them use standalone systems as well. My experience stems from using the stock wiring harness out of the U.S. pulsar which resembles that of the CA18DET wiring somewhat.

[Zushi]

well, i was checking out heavy throttle and they said that the blue/red and black/red that you put together into the black/red are for "main ignition power"...so i guess theyre not supposed to be grounded. heh. its actually only the one black/red that i connect the two into. damn, now i gotta go look for a ground along that line..bah.....

[Zushi]

hey, that black/red wire is pretty crazy to trace. it runs by my radiator then under the driver side fender(left hand drive) and then under the steering wheel where it goes to the other side of the key device...i think it also goes into the fuse box under the the steering wheel. think its possible i could just hard wire it to the ign and fuse box? or should i just try and find the flaw in my wiring. another thing that makes the job so much more difficult is that there was an alarm system installed with a kill switch. im pretty sure my problem is here because theres a whole lot of wires that ive never seen before in a stock S13 under the steering wheel...most of which look like alarm equip. none of them seem to patch a ground into the black/red tho. hrmm

[boost_boy]

The black/red wire is an ignition source. Unplug your ecu and see if the ground condition ceases from the black/red wire. If it does, then it's your ecu, which has the power to do such things.

[Zushi]

hey, unplugged my ECU and the ground is still there... the ground is somewhere between my battery area fuse box and my ignition switch...its nowhere to be found between the battery area and the ECU. i just can't trace the black/red that well since theres so many nooks and crannies for it to hide. think i could just hard wire a black/red wire in, in between the fuse box and the ign switch like the wiring diagrams show...then hook it up like heavy throttle says using my hard wire...??? or you think thats too risky/dumb......

[boost_boy]

Quote »or you think thats too risky/dumb[/quote] This one;) ! Start unplugging fuses at the engine bay's fuse box and see what happens.

[Zushi]

eh? to see whether or not its actually the black/red or a wire that is fused too?????

[boost_boy]

You asked whether it was risky or dumb and I responded by saying this one which meant both. Man, your problem is too detailed and you may need to go to someone that's a professional auto electrician and close to you. This one seems crazy, but if you want keep trying, go for it. It will get frustrating and this I can only promise. Did your harness come with your engine?

[Zushi]

no, i had a cut harness at first...tried to get that working but didn't work..so i bought one that was off of an S13 silvia..5-speed... it seems to be untouched... and anyways..the harness doesn't have the bad ground it seems... its beyond the harness...hrmmm

[Zushi]

well, i unplugged the fuses and the ground didn't go away..damn, i guess i got some work ahead of me....think i should just rewire it or take off my fender and try and source this little bugger out?

[boost_boy]

I guess you have to go back and see what you've done differently to your car before you got the motor. Remove all the relays in and outside the car to track this down.

[Zushi]

man, check this **** out...on my 10A Eng Cont fuse in my fuse box next to the battery...if i take out the 10A fuse and check the two wires that run into it..they still connect without the fuse...and they are both grounded...i disconnected the plugs near the battery that run to the ECU..meaning my ground is from battery to key...they should'nt be grounded..eh?

[float_6969]

Look, a post whore!!! Oh wait, it's me....

[boost_boy]

You are truly the post whore of the NICO CA section, hands down. That's okay, every forum has one, but I think you're the best. Be good at what you do.

[Zushi]

Haha, anyways... lol. Hey, so you said you are using Pulsar harness or you are driving a Pulsar? Just asking cause if you have a Silvia, I was gonna ask you to bust out your multimeter and see if we share common grounds(man what a play on words... lol...). I'm sure we don't(as I'm sure my grounds are not supposed to exist..heh) but I don't want to tamper with anything until I'm sure that the black/red and blue/red wires are NOT supposed to be grounded. Cant a post whore get a lil help?

[float_6969]

LOL, thanks for the support and recognition. As for your wires, which set are you talking about? If you mean the ones by the battery tray, they are definatly not supposed to be grounded.

[Zushi]

Hey, yeh, the ones by the battery area.. and the 10A fuse that the black/red goes into(on the fuse box cover its called Eng Cont) has both ends grounded. but like i said, this would mean that my bad grounds are all on the american side of the wiring harnesses...I do have an alarm system under my driver side dash...it patches into the black/red and what not but when i disconnect it from the black/red it doesn't change the grounds. Should I remove my alarm system(i didn't install it so that might be some good work) or just pull my harness..........heh. hrmmm