P0300, 3 and 5

[1gSE]

So for the last week and half i been getting a CEL for a random/mulitple cylinder misfire, #3 cyl misfire and #5 cyl misfire. I changed my plugs last week. I got the cel before that. I think it might be bad plug wires. If it where a coils going bad, i'd get codes for cyl 4 and 6 right? I double checked my wiring with the AEM FIC and everything is good to go there, but i need to find a MORE secure location for it.....maybe some double sided tape and sticking it to the ECU. I ordered some magnacore wires....but they're back ordered 3 to 4 weeks and i just can't wait that long, so as soon as o'rileys opens up, i'm gonna stop but there and get some replacements. The car sounds and runs fine and thats whats confusing me. I thought i might have had those 2 injectors stuck open, but wouldn't that make it run like ass at lower speeds? I haven't noticed any decrease in mileage either ideas?

[1gSE]

Well I decided to tackle this problem.....I installed the bypass harness, and put everything back. First time about half a mile down the road, i got a CEL for the #1 ignitor curcuit. I blame that on loosely putting everything back. I pulled the FIC out and tucked the wires back in, so far the car has fired about 6 time through out the day w/o throwing a CEL. I don't get...I've been over the wiring way too many times, I've even redone #5 and #3 injector in/out just to make sure I didn't have them wired backwards, but I ALWAYS get CELs for those 2 cylinders. I wonder if the fic is defective....

[1gSE]

Ok, so I finally got these codes taken care of. I took the cam sensor completely out of the fic loop. Since I wasn't using it to pull timing, there was no reason to have the signal going through it. I cleared the codes and took a ride up to base. No issues what so ever. Even that initial lean condition when going to WOT is gone. The AFR is dead on from about 13.3 when it hit the throttle and dropping to about 11.5 on the big end. I'll mess with it and lean it out some more when I get back from Italy. So if anyone is planning on using the FIC, its definitely possible, its just that the ecu doesn't like the cam sensor and crank sensor signals being messed with. I'm sure if you traced the wires to where both sensors ground and separate them, you could use the signals from both (I believe someone on TN tore apart his car to do that) Of course its a more expensive option compared to the NEO, and might be a little overkill since not all of its features are being use, but you can have a more accurate tune. I might order a new flying lead (I've hacked up this one lol) and wire in the o2 sensors for some closed loop tuning. I'm not exactly sure how that would work since there's only one o2 table, so I might just pass on that idea. It sucks that I just fixed all this and now I have to let the car sit for 6 weeks

[lemegacool]

i am currently speaking with jhlaird from TN about it (crank and cam signals)

here is what was said so far (start from the bottom)



Connect the wire, that is for both of the sensors, right out of the ecu to the FIC but where you connect the output from the FIC for that wire should be after the splice point. So one wire leads to the FIC for both of them but then comes out as two basically. If that makes sense. In my harness the splice was aways down from the ECU so I had to dig for it.

The resistor value is in the insturctions for the FIC I can't remember what it was. I have a 94' wiring PDF if you want it. I noticed that some of the wire colors were diffrent between a 94' and the 99' diagram.

Quote:
Originally Posted by lemegacool
thanks man! yeah i saw on the wiring diagram that both bensors used the same ground... so basically i just make my connection right a the ecu connector right? should be after the splice. also what is the value for the o2 resistor?

thanks

Quote:
Originally Posted by jhlaird
No I don't have a build log or post or anything. I actually need to take some pic of everything. I have a 99' 1mz btw.

I did have a problem when wiring the cam and crank sensors. The negitive for the two sensors connects to the ecu at the same point. You need to find the splice point and hook up the wires after it. The input to the FIC should be off that same wire but the output from the FIC or whatever should hook after the splice. Before I changes that it would act like it was hitting a rev limiter at around 3000rpm.

Thats about the only problem that I had with it. I had a problem maxing out my MAF. Under high boost it would act like it was hitting a rev limiter around 5000rpm. I clamped the MAF voltage a 4v and decreased the values by about 20% in some areas on the MAF map. I don't think you will run in to that problem unless you run more than 8psi.

I also used that resistor for the o2 sensors with no problems. Let me know if you run in to any problems wiring or in general.

Jake

Quote:
Originally Posted by lemegacool
hi!

as you may know i'm currently building a custom m90 supercharger for my car and i'm going to be using the aem fic as a ecu... (already bought it)

anything i should be aware of? like resistors to put or something like that!

thanks! is there somewhere i can see a build log of your turbo project?




so...

basically as i get it i should take the common sensor ground wire and find where it splits to 2 wires and then hook the fic on each of those 2 wire RIGHT??

that would suck not being able to mess with timing thats what make me buy the fic in the first place... lol but then again i got it for cheaper than a used safc2 lol