The Unexplainable happened.....please explain

[OM3GA]

So i recently got a tune from EMance for my NA ka with some mods, I have driven with it for around 300 miles just easy around town driving. Today i went to an Auto X and was gonna test it out a little more i drove over to the auto x about 30 miles from my house and when i got to the event we had to wait awhile to run so the car was just sitting.

I went to start it and everything was fine so i went onto the grid and lined up and got ready to run, It was my turn next so i went out took off at 1500 rpms like normal shifted to second at around 3k rpms was taking a turn at 3500 rpms and it just shut off completely i was still gassing and i looked at my tach it was a 0 rpms..

I pulled off the course and tried to start it again and it just was cranking so i got pushed off the course and parked and when i was looking at it i turned the key to 'ON' position and no fuel pump noise at all.. i checked for spark and nothing at all.. i tried it a few times i checked the fuel pump fuse and engine control and they were both fine.

My friend was there with his S13 and i decided to swap ecu's with him to see if that would work (Both happened to be code group 'EP') so i put his in turned it to the 'ON' position and tried to start it.. i heard the fuel pump this time and i also checked for spark and both worked.. but when i crank it for awhile i dont smell any fuel or have any signs of it being flooded from not starting. So meanwhile i try it a bunch of times and i prime it for about 30 min straight and i finally give up.. we go to put the ecu back in his car, it starts right up and he tries to shut his car off and he turned the key back one from the 'ON' position and it just kept running however the idle was a little lower.. he turned it back one more time and took the key out! still ran! he finally just stalled it to get it to turn off and all the seat belt,oil,e-brake, lights stay lit on the cluster even with the key out.. its as if the car is always in its 'ON' position..

Please help!

[OutToWinPAHC]

Since problems are occurring with both ECU's that kinda tell me its your car. A harness short or something. I'd check that thing out before you cause any more damage.

[niemczykj]

you shorted ur buddies ecu too and ruined his it sounds like.

[sloweighty]

so it couldn't have been the emance then huh

[OM3GA]

I have never had a problem before i got the tune which is why i think it may have something to do with it.. either way the emance ecu does not work at all yet my friends stock ecu is functional to an extent

[S13xCrazy]

Is your buddy's car still having the running problem without the key in?

Its possible its the tune, but I find it hard to believe.

You may have a short somewhere that's ****ing **** up.

[OM3GA]

yeah his is still doing it, I have never had a problem before i got the tune in thats why im assuming maybe there was a short in the ecu itself causing the malfunction.. As to why my friends ecu got a little messed up i have no idea.

[rsdans240sx]

just a thought...is your car lowered? If so did you re-route the harness that is in the fender well? I have heard of many fried ecu's from people failing to do that.

[OM3GA]

My car is lowered yes, not low enough for the tire to rub it ever so i dont believe that is a problem.. What would keep a car from starting when it has spark and i hear the fuel pump?? i had my friends completely stock ecu installed and it did not work either..

[OutToWinPAHC]

Just because you hear the fuel pump doesn't mean that the PCM is gating the injectors on.

[OM3GA]

well it works in my friends car though.. what do you think the problem is?

[1sikS13]

it all boils down to a wireing mishap something crossed somewhere. you are gonna have to look over your entire harness. The one in the engine bay that is

[carkook]

it all boils down to a wireing mishap something crossed somewhere. you are gonna have to look over your entire harness. The one in the engine bay that is

Thats what I thinking, maybe the fuel pump is working but the wiring to the injectors is no bueno.

[sicride]

you say you're not getting a fuel smell from the car, yet it's cranking and not turning over? I'd check to see if fuel is getting past the fuel filter. This is easy, disconnect the fuel line after the filter and then hold a towel to the filter on the open side, have a friend crank the engine and see if fuel squirts into the towel. continue to follow the fuel lines and see where it stops. if it stops at the fuel injectors then you know that theres a problem with the ECU. If your buddies ECU doesn't change this then the problem is in the wiring obviously.

[sloweighty]

so it couldn't have been the emance then huh

so can the EMance be the cause of this

[S13xCrazy]

so can the EMance be the cause of this

no.I don't see ANY possible way it could mess it up.

[AZhitman]

No offense, but I see a WHOLE lot of posts and not a whole lot of personal inspection.

Seriously, go inspect the harness. Check continuity in some easy places (MAF to ECU, temp sensor to ECU).

Doesn't sound like a tune issue.

[1sikS13]

No offense, but I see a WHOLE lot of posts and not a whole lot of personal inspection.

Seriously, go inspect the harness. Check continuity in some easy places (MAF to ECU, temp sensor to ECU).

Doesn't sound like a tune issue.

The Hitman Has Spoken!

[Naloos13]

Both ECU's are toast. 99% of the time its a harness short. The spots Hitman suggested are def. the most probable. Unfortunately i too fried 2 ecu's before i found my short. And even more unfortunately one was a Tomei tune....Anywho, CHECK YOUR HARNESS

[OM3GA]

Anyways i have opened the ecu and it was burned out in a certain spot ill post a pic in a second, And this was the first auto x i have taken the car too and no body lean with my 10kg 8 kg spring rate lol... anyways i have never had any problem at all with wiring and none of the wiring has ever been touched. You really think it is a short somewhere? i dont have any tools really to check it.. anyways heres a pic!

[Naloos13]

That is 1 of the 2 problems of a fried ECU. You can get a new trace put in (what i did for a long time) which will make it run again. I found a circuit board repair place and it cost me $40 to have both ECU's fixed with new traces. (a trace is the burnt line in the board) However, the second part of your problems is a bad diode. To this day no one knows which diode needs to be replaced. And unfortunately without the diode replaced your car will not shut off. Most resort to a kill switch, or just dumping the clutch and stalling etc.

zer...99890

That thread should answer any questions you have

[ILoveMyRHS13]

Am I the only one confused about the title?

[OM3GA]

Am I the only one confused about the title?

LOL!

[brandonDavid]

Am I the only one confused about the title?

absolutely befuddled.