1jz resistor pack/afc problem. Please help!

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kas14slider

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May 18, 2010
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Hi guys, in preparation for a single turbo I figured I would go ahead and throw in my mk4 550cc injectors. I had just recently installed my afc neo. The car ran fine. Step two was to throw in the injectors, and wire in the resistor pack. I got an acura legend pack, we tested it with a multimeter and it was ok. We wired it in according to this thread: http://www.clublexus.com/forums/performance-and-maintenance/565483-mk4-supra-resistor-pack-wiring-into-1jzgte.html The only thing done differently was that the 12v power wire from the resistor pack that was supposed to tap into the power for the injectors before the wires split into 6. But we looked at the wires and even the main wire before the split was the same size as all the ones going to each injector. If they were smaller, we would not have done this, but they were the same so we just tapped it in to one of the injector power wires.

First startup the car ran super rich but I realized I forgot to minus fuel on the afc for the 500 and 1000rpm range. And the battery was also dying. So we hooked up jumper cables, I subtracted fuel -50% across the board and tried starting it. After this the car has never ran or started. And no matter how much fuel I subtract (anywhere from -5% to -%50) on the afc, the car does not start. Then I took the plugs out and they were soaked with fuel. Cleaned them off and then the car ran for about 10 seconds on -15% across the board. It seems like it is still rich but I don't even know anymore, maybe its leaning out. I am out of ideas besides:
-Get completely new plugs
-Wire the power wire from the resistor pack to where it is one big wire before it splits to 6
-Change afc settings?

If anyone can chime in. How much fuel reduction are you afc guys running for 550cc to idle? What are your thoughts on how the pack is wired?
 
OneJArpus

OneJArpus

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Jul 1, 2005
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I would double check the wires.


When i had my 550s and resistor pack i used a 7M resistor pack and subtracting fuel only does so at WOT... when its cold the computer does what it needs too to get the car running.. So Zero everything out make sure that is setup properly and try to start if it doesn't. Go back to what you did last because that is where your problem lies.... If not an injector could be stuck open, have a friend with a screw driver lightly hit the injector while you are cranking it.

Are all spark plugs soaked or just a few?... IIRC the stock ECU is on a batch fire system so it could be firing incorrectly.
 
525gte

525gte

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Sep 19, 2011
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hoquiam
OneJArpus;1907222 said:
I would double check the wires.


When i had my 550s and resistor pack i used a 7M resistor pack and subtracting fuel only does so at WOT... when its cold the computer does what it needs too to get the car running.. So Zero everything out make sure that is setup properly and try to start if it doesn't. Go back to what you did last because that is where your problem lies.... If not an injector could be stuck open, have a friend with a screw driver lightly hit the injector while you are cranking it.

Are all spark plugs soaked or just a few?... IIRC the stock ECU is on a batch fire system so it could be firing incorrectly.
Click to expand...

Unless you have cams in your car.. if you do you will have to pull fuel at a idle. To get the car to closed after it s warmed up.. it will run rich cold till that point
 
525gte

525gte

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Sep 19, 2011
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hoquiam
OneJArpus;1907246 said:
Negative i have cams in my car and i didnt have to do anything
Click to expand...
Really? Does it idle in closed loop?. With the cams in my car it only makes like 14inch vaccum so the car thinks its under load and would ilde rich like 10.5 to 12.5. After tunning out like 8 percent at 800 rpm it would idle closed loop.
Or do you have a tunned ecu ?.. I was also running the sfac2 not the neo
 
scottiedawg66

scottiedawg66

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525gte;1907299 said:
Really? Does it idle in closed loop?. With the cams in my car it only makes like 14inch vaccum so the car thinks its under load and would ilde rich like 10.5 to 12.5. After tunning out like 8 percent at 800 rpm it would idle closed loop.
Or do you have a tunned ecu ?.. I was also running the sfac2 not the neo
Click to expand...

That is exactly how my car with 272s and 550s behaves as well
 
525gte

525gte

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Sep 19, 2011
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hoquiam
Will the car start now ?I am assuming that you unhooked the battery for this.. if you did you need to go and drive the car for like 30 mins for the ecu to relearn after that it will prob idle for you and run . Than you can fine tune the afc .

If you are nervous about driving it. Have someone follow you just in case it their is something else wrong and it needs a tow home
 
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kas14slider

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May 18, 2010
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State College, PA
So the car just sat overnight with battery disconnected. Just hooked it up, set everything on the afc to zero. Tried starting it and it doesn't even start. So I stopped turning it over. Then i set everything to -25. Still nothing. So it cranks but doesn't start at all. I have no idea how it did start initially after the injectors were put in yesterday, but now nothing at all. Is it possible that my plugs are completely fouled and I need new ones for the car to even run. I cleaned them out but maybe I just need new ones?
 
525gte

525gte

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hoquiam
My advice is to change your plugs with new ones. And if that don't fix it... removed the resitor box. And the afc put the stock injectors back in and start over.. make sure the will run and drive.. than install the afc and make sure it is all working properly than redo the resitor box and injectors.. that way you can elimanate any issues one at a time.. if you put it all back to stock. And it don't start than maybe you have other issues.
 
525gte

525gte

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Sep 19, 2011
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hoquiam
kas14slider;1907840 said:
Well if you read my first post, I had the afc installed before i did the injectors and resistor pack. The car ran fine with no problems on the afc.
Click to expand...

Yeah read that couple days ago and forgot.. sorry. Well than remove reistor pack go back to stock injectors. I mean get rid of the stuff that you changed. Its prob a bad resitor pack or you have something wired wrong.. its almost always something stupid.. you just have to go thru a elmination process. If search and go thru the threads. I am sure you will find many others that had the same problem as you.. mrk3tattoo had the same issue with the 7m resitor pack. And turned out his issues was just a simple matter of going out to drive the car. So go back to drawing board.
 
SupraMedical68

SupraMedical68

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Feb 26, 2007
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525gte;1907857 said:
Yeah read that couple days ago and forgot.. sorry. Well than remove reistor pack go back to stock injectors. I mean get rid of the stuff that you changed. Its prob a bad resitor pack or you have something wired wrong.. its almost always something stupid.. you just have to go thru a elmination process. If search and go thru the threads. I am sure you will find many others that had the same problem as you.. mrk3tattoo had the same issue with the 7m resitor pack. And turned out his issues was just a simple matter of going out to drive the car. So go back to drawing board.
Click to expand...

Aren't a couple of the diagrams screwed up? I remember reading through some of the threads a long time ago, and there was a decent amount of misinformation going on.
 
K

kas14slider

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May 18, 2010
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State College, PA
Ok, so apparently with the resistor pack I wasn't getting enough resistance and after trying to wire it a couple different ways it still did not supply enough resistance. So I put 440's back, removed the resistor and the car still runs really fucked up. It looks like it is running super lean and only firing on a few cylinders. Is it possible that since my resistance was not high enough before, I fried a couple injector drivers in my ecu?
 
OneJArpus

OneJArpus

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On my car my idle was 13-15 with HKS 264's, 550's, SAFC 1, and a stock Computer.


I'm on 850's now and with a standalone so i can try anything else out right now. Just my experience though, i hope ya figure out your issue.
 
525gte

525gte

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Sep 19, 2011
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hoquiam
kas14slider;1908500 said:
Ok, so apparently with the resistor pack I wasn't getting enough resistance and after trying to wire it a couple different ways it still did not supply enough resistance. So I put 440's back, removed the resistor and the car still runs really fucked up. It looks like it is running super lean and only firing on a few cylinders. Is it possible that since my resistance was not high enough before, I fried a couple injector drivers in my ecu?
Click to expand...
you ck your injectors firing with a noid light.
 
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