wasn't it because of how the construction of the harness is? splicing the harness doesn't need this fix

that's what im getting at

 

this would be the first iv heard of that....i was told more than once that it was an issue with the car or sensors emitting a frequency that screwed with the fic...maybe someone els can explain it better.

 

< doesn't know the whole situation

don't listen to me i suppose you have to do it on all harnesses then

 

well i got word a couple days ago that the pnp harness that dezod sells come with resistors installed already.

 

yea, dezod gets it from boomslang though

 

thats what i thought

 

Just an update, i let my car run off of the FIC Friday night. I took it out for a ride and it seemed to have a random miss fire around 3-4K. It happened twice. I wasn't sure if it was just the map that i was using or the lack of the resistor. So Saturday morning i got the resistors from radio shack and installed them... i also changed the map to give it a little more fuel. After i did that no miss fires and no check engine light. So i am guessing that the resistors helped me here.

 

nice write up.. ill see if i jump on this

 

great post, car was shuddering really bad at high rpm before I did this mod.

 

damm im gonna have to do this also thanks

 

The Boomslang harness already has 2.2k resistors on the crk and cam inputs. Then again, in the photo on page 1 of this thread, it looks like the harness pictured already has the resistors too. BS uses tiny 1/8W 2.2K resistors installed between crk magi+/- and cam magi+/- down near the ECU connectors and covered with heatshrink.

I would recommend checking the resistance between crk magi+ and crk magi- and cam magi+ and cam magi- before adding resistors. OTOH, maybe 2.2k is too high and dropping the resistance to 1.1k with a second resistor helps. Can someone who has done this mod to their Boomslang harness pls measure your actual resistance and post it? TIA.

You need to measure between pins 8 & 19 on the 22 pin connector and pins 9 & 10 on the 24 pin connector.

 

Ill have to check mines

 

FWIW, according to Boomslang, every TC harness they've made since early 2007 has had 2.2K resistors installed between crk magi+/- and cam magi +/-. I find it interesting to see that so many seem to be having more success by adding an additional 2.2K in parallel for an actual resistance of 1.1k. It makes me wonder if 2.2k is really the best R value for our application.

Until someone who's done this mod puts a meter across their FIC terminals, we won't know.

 

How about this ish... I have 2.2K resistors between crk magi+/- and cam magi +/- but I'm still getting severe stuttering at 5000rpm in boost and some P0335 crk codes. I call AEM tech support and am told that they don't recommend installing these resistors and suggested that I remove them. WTF?

It sure would help to know if anyone solved their high-load misfiring by adding resistors in parallel with existing resistors. I'm not sure which way to go, no resistors or 1.1K resistors.

 

"And some of you may ask, "if I don't have stuttering issues, can I do this anyway?" Yes you can! It won't hurt anything if you do the mod."


FYI, I had serious stuttering/bucking issues starting at 5000rpm and got a P0335 crk sensor code everytime I hit ~5000rpm with the resistors installed exactly as detailed in this DIY. Removing the resistor from the crk magi+/- solved the problems. I left the resistor on the cam inputs since everything works as it should now. If I ever get a cam code that resistor will be the first thing to go.

I was skeptical when AEM told me that the vast majority of Scions do not need these resistors and told me to remove them. AEM was right, don't install them unless you really need them. This mod caused me untold grief.

 

Does anyone have an experience with this company?
It was listed in the AEM F/IC instruction manual.
It is cheaper than the Boomslang and Dezod.
http://www.autosportwiring.com/scion.htm

 

AFAIK Autosport Wiring only makes ECU patch harnesses. You'd still have to splice your EMU into their patch harness. Boomslang harnesses are PnP for whichever EMU you're using.

 

Thanks alot man! so you suggest to not install the resistors unless I have the studdering issueS?

 

Had a tc that was throwing codes with resistors.. took them off.. wala no more codes!!!!!!!!!!!1

 

you dont have to tell me twice lol