I was working on my FD, replacing the OMP lines, installing a Sohn adapter, and performing an ACV delete. When I disassembled everything, I found that the ACV was still installed but only to block off the holes. After reassembling, I added a couple gallons of premixed fuel at a 1:100 ratio to avoid running dry while the OMP lines were filling.

Additionally, when I removed the oil injectors, I noticed the vacuum nipple on them was capped. I couldn't find a definitive answer on whether they should be plugged, exposed to vacuum, or ambient pressure, so I ran vacuum lines to them to avoid having to remove the intake later. However, capping or venting them to atmosphere didn’t seem to affect the issue.

Right now, the car starts but misfires, runs rough, and produces a lot of blue smoke. My two main theories are: either the car is getting too much premix (around 1:50 with the Sohn adapter, which should be an easy fix), or something happened when I moved the coil pack, causing an issue with the ignition, as I’m unsure how delicate they are.

 

i don't see a way to aid in troubleshooting as A LOT had to be moved or touched to do what you did. the best thing you can do is go back over what you did and see if something is out of place. if it helps, the oil injectors aren't going to "inject" enough oil to cause the issue you are describing so that could be ruled out. also, even at 1-2oz/gallon, there wont be enough premix in the tank to cause what you're describing even WITH the oil injectors. your problem is somewhere else entirely.

 

I should have mentioned earlier that all the emissions components under the intake have been deleted and tuned out, so there wasn't much that needed to be adjusted aside from what's attached to the upper intake. If 2oz/gal won't cause a misfire or rough idle, I’m leaning towards the coils being the issue. However, I’ll take a closer look and go over everything. Thanks for the reply!

 

What ecu?

 

power fc

 

What year is the car?

Coil pack position was changed after late 1995 (commencing with Version 4) cars. If USDM FSM is used tas a guide o rehook up the coil harness, or plugs leads, they may be going to the wrong connection points.

This is very dangerous for your motor.

 

It sounds like you may have put in way too much premix. I may be misunderstanging your syntax.

If the vacuum house nipples on the oil injectors were plugged off, what was happening at the normal source of vacuum.

I assume it would have been blocked off as well.

Perhaps look into that.

Maybe you have a vacuum leak related to that.

(This indeed happened to me, my vacuum lines to the oil injectors had rotted away.)

How old is the fuel in the car. If it has been stored a long time and if it has some ethanol mixwd in, the gas may have significanlty degraded.

 

https://www.rx7club.com/3rd-generati...iring-1168174/

 

Yeah. I see the car is a 99. So the coil position and harness would be different from USDM.

I recently had a tech hook the coil harness in the wrong order and the running problems were very much as you describe.

(Except the blue smoke part. That is probably too much premix oil.)

 

Don't run the car until you have check your coil hook-ups.

Also any time anyone touches your plugs or coils, check again, and again.

 

Yeah, it's a '99, and the gas is brand new i just got it three days ago. Right now, I’ve mixed about 1.28 oz of oil per gallon of gas, but if the OMP is working, that’s a lot of premix. The oil injectors were capped off, so I assume the system was blocked, but I can’t figure out exactly where. The entire rats nest was deleted, and it was swapped to a big single by a shop in Japan. Also, I’ll definitely go over the coils again. They weren’t unplugged, but they were moved, so something could’ve come loose.

 

Perhaps check the ignition system grounds and the big one from the UIM to the firewall.

Version 4 and newer cars had a "rat box" rather than a "rats nest", but nevermind, it has been deleted.

 

You should, at least , have the wiring manual for Version 5.

Here is a link to the Laujesse download.

Password is in the download filename.

https://www.rx7club.com/3rd-gen-gene...002-a-1127911/

 

got it thankyou im going to check my coils out today

 

Check the actual wire colours for your coil harness to confirm it is hooked up correctly.

 

so im still going through the manual and everything but heres some pics of it now

 

 

It seems each plug pair should have a Black/Red grounding wire. Then from the top the lead wire wires are: Red (R) then Blue(L) /White (W) then Yellow (Y) /Blue (L)

This is from Veriond 5 wiring diagram.

 

Your wire colours don't look correct.

As getting those wires wrong can have a very bad effect; I leave it to you to make sure you have the right wiring diagrams and interpret them correctly.

 

they're correct they probably don't look right in that picture but going from front to rear its red, blue and white, and blue and yellow. pulled them all out to clean up the contacts

 

This one just came out of my car. It seems to match yours? Just have ot make sure the plugs are connected to the correct coils. The diagram is a bit confusing as it has the coils in reverse order to the way they are mounted.

 

yea my harness matches yours so im fairly confident that the coils are wired correctly that and it was running fine before this

 

I replaced my coil harness on suggestion of the dyno shop. My power was breaking up over 6000 rpm.

They said I should replace the #2 engine harness (ignition harness) as well. I have yet to do that.

 

Lat year, although my coils showed current, we still suspected they were weak and replaced them.

 

pk o got it fixed it runs fine and smokes like a chimney because of all the oil but i feel real dumb for not noticing this sooner but it was the boost sensor vacuum line had came unplugged