HEI Dilemma

[kulluminati777]

i removed the 3 pin and now the tach works but still horrible idle like it barley even wants to stay on....

say i wired up everything right and the HEI mod worked...could it of fouled the spark plugs or maybe my o2 sensors got saturated..maybe the causes for hesitation...PLEASE SOMEONE HELP!!!

[davmac]

I'm probably missing part of the story but how did the car run before adding HEI module?
So assuming that before you replaced the ignition module the car was running great and then suddenly stopped running and could not or suddenly would not start. If true then go back to ground both the module (back and / or through the hole) plus wires. I know the grounds are critical. I've seen several threads with people frustrated until the module plus appropriate wires were finally grounded.

Is there any chance that adding the HEI module has nothing to do with this? That bad idle and hesitation is bad spark plug wires, vacuum leak, TPS needs to be set or any of the common issues?

[kulluminati777]

I'm probably missing part of the story but how did the car run before adding HEI module?
So assuming that before you replaced the ignition module the car was running great and then suddenly stopped running and could not or suddenly would not start. If true then go back to ground both the module (back and / or through the hole) plus wires. I know the grounds are critical. I've seen several threads with people frustrated until the module plus appropriate wires were finally grounded.

Is there any chance that adding the HEI module has nothing to do with this? That bad idle and hesitation is bad spark plug wires, vacuum leak, TPS needs to be set or any of the common issues?

thank u thank u thank u.......but right before the car shut off it was running the same maybe a little better then now lol mazda could not find what was wrong with the car exactly but said it had something to do with the ignition...so what i did was replaced the spark plugs, wires, took it back and they said the same thing....but a few days later the car just shutoff on me on the way to work and would not start..so after the HEI+external coil mod it fired up but it just runs shitty (when cold it idles normal the warms up and is pretty bad, also the other day while driving it drove normal for a minute then popped right back into hesitation mode )...so maybe a crank angle sensor? and as far as the ground is the NEG battery terminal not sufficient enough? and as far as what else it could be i guess i can trouble shoot other things.....

[davmac]

Assume for now ignition is issue. Also safe to say you've wired things correctly or it would not run at all. 2 things you might improve ground and completely remove the old coil.
The W terminal and the back of the HEI module need to be grounded. I would prefer both were grounded to the same place since some grounds have different potentials and it is near impossible to ground the back of the HEI module to the neg battery terminal. Take a look at this old link. Notice how the back of the module is grounded on the bracket and the W terminal wire is also grounded to the bracket mounting point.

Also because you were formerly having issues with tachometer signal that may mean that the internal coil is still connected. Since you have an external coil you really need to be sure to remove the internal coil or disconnect it by removing the strap. Again the instructions at the link above cover this. It is possible you are sending 2 competing signals down the spark plug wires.

[cWs306]

im having an ignition problem too but mine is at the point of where my car will not spark and mine started the exact same way as yours. stopped running randomly as i was driving then took forever to get running again and then when i wired the HEI module it ran good for a night but would spudder at around 6000rpms. then started very rough the next day like to the point where i had to start pumpin the gas to keep it going and hasnt started since. sound similar?

have you checked the cap/rotor to see what there like? maybe ur cap n rotor r just worn out. also when you hooked up the hei module did you snip the orange wire on the 6 plug? thats the stock ignition module. and 1 thing i can say is take ur ground and ground it to the bracket/bolt you make to hold the module. if u can find my post its name is 0 spark. it might have something there to help you. 6 pages of ignition problem discussion. and did you put the white heat crap on the back of the module? it also helps alot to keep the module from over heating. and what size is your ground wire? 16 gauge? try going with 12 or 14. i used 10 but that seemed a little much. good luck man!

[davmac]

and did you put the white heat crap on the back of the module? it also helps alot to keep the module from over heating.

If that white heat crap is arctic silver or similar material you need to know that it is non conductive. There are some silver pastes that conduct electricity - but most are intended to conduct heat from a processor to a heat sink. Here is a potential problem: you've isolated your HEI module from ground with the paste. The HEI module will stay cool enough if it is grounded - both the W terminal and the back of the module. Some are successful grounding the module through the mounting hole but some modules are best grounded simply by the back of the module. The module itself must be grounded so it never hurts to mount it so the back is making great contact with metal that is grounded to the car frame.

[kulluminati777]

im having an ignition problem too but mine is at the point of where my car will not spark and mine started the exact same way as yours. stopped running randomly as i was driving then took forever to get running again and then when i wired the HEI module it ran good for a night but would spudder at around 6000rpms. then started very rough the next day like to the point where i had to start pumpin the gas to keep it going and hasnt started since. sound similar?

have you checked the cap/rotor to see what there like? maybe ur cap n rotor r just worn out. also when you hooked up the hei module did you snip the orange wire on the 6 plug? thats the stock ignition module. and 1 thing i can say is take ur ground and ground it to the bracket/bolt you make to hold the module. if u can find my post its name is 0 spark. it might have something there to help you. 6 pages of ignition problem discussion. and did you put the white heat crap on the back of the module? it also helps alot to keep the module from over heating. and what size is your ground wire? 16 gauge? try going with 12 or 14. i used 10 but that seemed a little much. good luck man!

sounds very similiar but mine never just stopped starting....i will look through the post for sure thanks bro

Assume for now ignition is issue. Also safe to say you've wired things correctly or it would not run at all. 2 things you might improve ground and completely remove the old coil.
<span>The W terminal and the back of the HEI module need to be grounded. I would prefer both were grounded to the same place since some grounds have different potentials and it is near impossible to ground the back of the HEI module to the neg battery terminal. Take a look at this old [url=<a href="http://www.clubprotege.com/wil/howto/hei/index.htm]link[/url]" class="smarterwiki-linkify">http://www.clubprotege.com/wil/howto/hei/index.htm]link[/url]</a>. Notice how the back of the module is grounded on the bracket and the W terminal wire is also grounded to the bracket mounting point. </span>

Also because you were formerly having issues with tachometer signal that may mean that the internal coil is still connected. Since you have an external coil you really need to be sure to remove the internal coil or disconnect it by removing the strap. Again the instructions at the link above cover this. It is possible you are sending 2 competing signals down the spark plug wires.

and i think this weekend i will look for the best ground and see if that fixes it...i just never found a good spot to mount it on the frame without moving the battery or somthing (MX6)

[kulluminati777]

also can i use the 96 wiring diagram for a 93...its the only one one here.......

[cWs306]

the last page in 0 spark post, dan posts a link to another post that has every wire diagram. i dont think 93-96 are the same? :S i might be wrong tho.

[Daninski]

Here ya go. http://www.mx-3.com/phpBB3/viewtopic.php?f=23&t=69006

[kulluminati777]

Here ya go. http://www.mx-3.com/phpBB3/viewtopic.php?f=23&t=69006

thanks bro..ill recheck all wiring and then make sure my ground is good but the weather has been awful so i may have to wait till this weekend