Misfire into multiple cylinder!

[maxthehax]

Till last week something started. Sometimes when on low-mid load, the engine feels like it cut-off for a second only, and it started to bug me. I was still able to drive it normally without major problem.

I though it was my MAF getting too dirty, so I cleaned it. It did not cure the problem and Im not sure if it helped. Car was still driving perfect except that little cut-off.

Today, I started to intall my oil cooler. I did not finish the job because of a malfunction in a part. So I simply put back my oil filter and some intercooler piping on.
Batterie was plugged all the time.
I cutted, I grinded, with 2 tools, a grinder and my dremel.
And I played with my oil filter...

Those things are the only one I did... This morning I start the car and it runs like a Cam'd muscle car or a subaru.
3 CEL; P0300, P0302, P0303, well I think they are all missfire into one or multiple cylinder.

Could I have damage something electrical? Coils, or the FIC? Maybe a fuse? Because I used my electrical tools on the car.
http://img801.imageshack.us/img801/9044/imag0584w.jpg


This morning when my car was missfiring like shitt, I started by removing all intercooler piping, clean the inside, reclean the MAF.
Now the problem is almost gone, I can take-off from the first gear, and the engine idle a lot better. But it is still not good, on load it look like it missfire/cut-off.

I will try to change that MAF for a new one, also I think it would be good to change my O2 sensors they are old as hell.

[maxthehax]

UPDATES

This morning the car was bad as hell, missfire into multiple cylinder again. P0300, P0302, P0303, P0304...

I simply removed my AEM FIC, replugged like OEM, the car runs fine now but very very rich! The stock ecu cannot take my 370cc injectors

So I think my FIC was the problem...

I will reinstall my stock injectors, or I will simply fools my plugs running that rich. 10:1 AFR on low low low load... haha 12:1 idle

[1.5]

those things are always having issues. So many units have problems. Hope they send you a new unit.

[Yoda]

Do you have the plug and play or is it wired in?

[maxthehax]

Do you have the plug and play or is it wired in?

I have the plug n play harness... Thats why it took me 5 mins removing it and plugging the oem back.

I need to find out whats the best standalone ECU to get for my car, it seems to be so big of a job...

I lost so much power all over my rpm/load range without the FIC, thats incridible!...

[Yoda]

It might be the unit but most issues with it are due to wiring it up. But you have the pnp harness so I don't know. I heard sone had problems with the boomslang harness tho. Ask Scott

[maxthehax]

It might be the unit but most issues with it are due to wiring it up. But you have the pnp harness so I don't know. I heard sone had problems with the boomslang harness tho. Ask Scott

I ran the FIC for a year now, It was fine until about a week. And a morning it simply wont work like I described in first post...

Anyway I would just like to learn more about the work implicated into installing a full standalone ecu on my car. I dont want to plug a piggyback again...

Unfortunatly there is no documentations about installing lets say a universal EMS on my car...

[maxthehax]

I have updates;

Even if my FIC worked ``fine`` for a year before messin up, I decided to take a close look at the wiring. Lets says the lack of PLug N play standalone system and their very high prices make me think about it a couple days. I come to the conclusion that I already spent enough and I have other project in life (dont worry I still love my car like before! lol)

So to make sure I have a 100% correct connections I decided to buy a PLUG N PLAY harness for the scion xb, sold by dezod.

I will give more infos when I receive that harness and try it out!

[cali yaris]

^ You didn't buy from us? :frown:

[cali yaris]

I have the plug n play harness... Thats why it took me 5 mins removing it and plugging the oem back.

Even with custom wiring, I believe you can use the Null connectors that come with the FI/C and disable it. I did that on mine before my tuning was done.

[fnkngrv]

Even with custom wiring, I believe you can use the Null connectors that come with the FI/C and disable it. I did that on mine before my tuning was done.


Yup....I am still using my bypass since I can't seem to idle for shit with this replacement motor. Using same maps as other motor which would idle fine, yet with this one it won't. Stupid.

[maxthehax]

^ You didn't buy from us? :frown:

Lol, do you really make a plug n play for the echo?

I though you were but for the Yaris...

Updates;
My package just passed the Canada border. I should reveice it during the week.

I feel a lot like I will plug everything and it will still be the same lol. At least I will know its not a wiring issue.

Q: Does it happen sometimes that FIC/piggyback unit could lost some datas in memories?

[cali yaris]

A: It's easy to reload your map, and see if anything changes.

Lol, do you really make a plug n play for the echo? I though you were but for the Yaris...

You're on our forums -- you know we serve all brands of cars and source parts for everyone. If I don't have a chance to earn your business, I can't be a vendor. :frown:

[maxthehax]

A: It's easy to reload your map, and see if anything changes.



You're on our forums -- you know we serve all brands of cars and source parts for everyone. If I don't have a chance to earn your business, I can't be a vendor. :frown:

I understand :P

And dont worry I already rock`s a couple of your parts :P

I just received your new fuel rail, very nice finish. If I can get that FIC working again, it will be my next install.

Btw, off topic, are you able to source me a carbon fiber hood for my echo/vitz hatch?

Thanks

[cali yaris]

^ I'll check, but probably not from the USA, I don't think we had the Echo hatch here, or very many of them -- maybe someone else knows better than me.

[maxthehax]

UPDATES;

Harness installed. I still get missfiring, I can move the car but not drive it. It runs rough...

I want to plug a laptop on it. What should I look at first if my problem is missfiring?

Thanks!

[chaditotx]

What do your plugs look like? Coilpacks? Did you nick anything on the factory harness? Crank position sensor?

[maxthehax]

What do your plugs look like? Coilpacks? Did you nick anything on the factory harness? Crank position sensor?

Everything was alright... The FIC unit itself was the problem.

I changed to a new unit with the same PnP harness, everything is fine now.

Thanks for inputs everyone!

[thefalls]

So the FIC was good for only one year. Hmm. Is there anything else,piggyback than we can use. Emanage Ultimate?

[yaris2010RS]

after a year AEM replaced your FIC? whats the warranty on these things?

[cali yaris]

We now have a Boomslang harness that is plug 'n play with the AEM EMS2, in case anyone wants even more control and a better management unit. The EMS can take over any function from the ECU, including the ability to retard/advance timing.

Not a cheap proposition, but the best of both worlds and the way I would have done it were it available at the time!

[Focus_Sh1ft]

We now have a Boomslang harness that is plug 'n play with the AEM EMS2, in case anyone wants even more control and a better management unit. The EMS can take over any function from the ECU, including the ability to retard/advance timing.

Not a cheap proposition, but the best of both worlds and the way I would have done it were it available at the time!

I don't even.... WHAT.

So you're saying there's no need to run new wires to all the sensors, and instead you can just utilize the factory harness?

That sounds too good to be true.