injector keeps pumping gas into cylinder

[johnverheij]

hi guys,

i finished my 7m 1jz swap
at first the engine was running fine

i had installed sard 540cc injectors
because i wanted to start with a big single
but later decided to stay with the twins for the time beying
but these injectors are to big for the stock twins
then i installed a apexi afcII fuel computer

then the shit begun
suddenly the engine running on 5 cilinders
and smoking like hell
and smelling gas everywhere

at first i thought it was a sard staying open
so i put back the stock injectors
but the problem stays

is it possible that my ecu is gone?

 

[Clint]

sounds to me like you have a stock open injector but if it keeps happening maybe you have a bad fuel sensor... Dont let your motor hydrolock that is bad news bears...

 

[WhtMa71]

Yea it might be a good idea to send your injectors out and get them tested.
Im sure its some kind of problem you're overlooking concerning the swap. I'll let the jz gurus step in.

 

[johnverheij]

this problem started with the sard 540cc injectors

so i switch them back for the stockers
but the problem stays the same

 

[Freshmaker]

The way you wrote the story makes it sound like the problem came after the AFC, can you return the wiring to stock and see if the problem persists?

It sounds to me like you mixed up a wire somewhere. ie. dis-ableing one injector and running one open full time.

 

[johnverheij]

The way you wrote the story makes it sound like the problem came after the AFC, can you return the wiring to stock and see if the problem persists?

It sounds to me like you mixed up a wire somewhere. ie. dis-ableing one injector and running one open full time.

the problem indeed came after i installed the afc
but at first it was running fine

when it starting running weird i de-installed the afc
but the problem stays

 

[Clint]

the problem indeed came after i installed the afc
but at first it was running fine

when it starting running weird i de-installed the afc
but the problem stays

Have you tryed checking for codes? maybe reset the ecu and try again. also check your connections on your engine harness...

 

[Freshmaker]

the problem indeed came after i installed the afc
but at first it was running fine

when it starting running weird i de-installed the afc
but the problem stays

Still sounds like a wiring problem, have you double checked?

 

[johnverheij]

the ecu was already reset
i did not check the codes
i will do that
i don't think it is a wiring problem
nothing changed there
and all the connectors are stock

 

[Freshmaker]

Did you try taking the 1JZ computer apart to check for blown caps?

 

[johnverheij]

i took it out but did not had the time to open it
but i will certanly do that

thnx

 

[bigaaron]

Bad capacitors is usually the cause of that problem.

http://www.supramania.com/forums/showthread.php?t=46755

 

[johnverheij]

well i just opened my ecu
all the caps looks fine
but there is 1 resistor fried.
and who knows what other componets are dead

 

[johnverheij]

here a picture of the ecu

 

[Freshmaker]

Most local TV/VCR places can replace components like that, but I would go for a supra-supporting place such as drift motion.

Edit: I meant TV/VCR repair places

 

[Rich]

As the possibillity that it is a faulty injector has been ruled out and if 1 cylinder is not firing it can't be the injectordrivers as they are fired in pairs; you would allways see 2, 4 or all injectors not firing if there's an injectordriver problem. On the ecu there's only 3 injector ports, the wiring is split near the manifold to 6 wires.
I'd say it has something to do with the ignition, as these are dedicated per cylinder. And yes, this would most likely be the part which is fried on the board, but could also be something else in the system.
But defenitely not a faulty injector driver here.

 

[youp]

Most local TV/VCR places can replace components like that, but I would go for a supra-supporting place such as drift motion.

Edit: I meant TV/VCR repair places

i dont think drif motion has a shop in the Netherlands, or do they? ifso where, so i can go there! :sarcasm: :icon_lol:

 

[bigaaron]

i dont think drif motion has a shop in the Netherlands, or do they? ifso where, so i can go there! :sarcasm: :icon_lol:

:biglaugh: I wish! We should have a shop open there by summer 2107. :sarcasm:

You probably would want to change the electrolytic capacitors even if you can't see obvious leakage. They can be bad and look good visually. As mentioned earlier, any good tv or stereo repair shop should be able to handle it no problem. Another option is to purchase a "solder sucker" if you already have a soldering iron and order the correct value capacitors online. Make sure to get the same value in microfarads, and the same voltage or higher.
eg:You can use a 25v cap to replace a 15v cap, but don't go lower then the origional rating.

 

[johnverheij]

this week my new ecu came in
so i installed it
@idle it runs great
but when i hit the throttle the engine is to run on 5 cilinders
just for a second and than it is running oke again
also when your driving it does the same

anyone an answer on that?

 

[thevork]

spark plug wires new john?