Injector doesnt close?

[wewerica]

Hello everyone,
maybe Im posting on the wrong place but I have an issue with my corolla 4AGE engine.

I have some issues with injecting... cylinders #3 & #4 are not firing as they should and spark plugs are black.

I've changed distributor arm and distributor cap. Checked injectors. All good
Compression on all 4 cylinders are great (~190 PSI)


Compression test on all 4 cylinders is the same


Spark plugs on cylinders #3 & #4 are like this on #1 & #2 are normal.



Tried:
- replaced injectors
- check old injectors with Tunerstudio INJ test tool, all injectors are "clicking"

Is it possible that DIYPNP has some problems?

Maybe I've forgot something to write.

[jsmcortina]

If you swap the injector wiring around, does the problem follow the injectors or the wires?

James

[wewerica]

@jsmcortina
when I switch injector wiring from #2 to #3, #3 cylinder works #2 doesnt

[jsmcortina]

I don't know a lot about the DIYPNP. Best to discuss with your supplier.

James

[Blown88GT]

...
Tried:
- replaced injectors
- check old injectors with Tunerstudio INJ test tool, all injectors are "clicking"

Is it possible that DIYPNP has some problems?

Maybe I've forgot something to write.

I have a DIYPNP, some of it is the same as yours.
It's not injectors, it's ignition. Plugs are not firing.
Double check the docs for yours, see section DIYPNP Jumper Configuration
https://www.diyautotune.com/support/tec ... a-corolla/

[wewerica]

Car was running for one year without any issues and one day it just died


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[Blown88GT]

Car was running for one year without any issues and one day it just died ...

You didn't think this was important enough to mention in the 1st post?

@jsmcortina
when I switch injector wiring from #2 to #3, #3 cylinder works #2 doesnt

Bad connection.

[wewerica]

Car was running for one year without any issues and one day it just died ...

You didn't think this was important enough to mention in the 1st post?

I forgot it sorry
I was driving it one day uphill and when I got to the traffic light car was running like a crap

@jsmcortina
when I switch injector wiring from #2 to #3, #3 cylinder works #2 doesnt

Bad connection.

I've changed distributor arm, cap and spark plugs but no luck. Tried with cables too.

Checked the injectors all working as they should.

Checked connection between injector connector and ecu connector, its fine.

[Blown88GT]

Get inline spark tester.

[wewerica]

Get inline spark tester.

Why do I need this?

Spark is ok on cylinder #3 when I switch connector from injector #2 to #3. Cylinder #3 works like this.

[Blown88GT]

You stated:

...check old injectors with Tunerstudio INJ test tool, all injectors are "clicking"
...Spark is ok on cylinder #3 when I switch connector from injector #2 to #3...

If the injectors are functioning, then it must be the spark plug that's not.
How did you determine that spark is okay without using a spark tester?

[wewerica]

You stated:

...check old injectors with Tunerstudio INJ test tool, all injectors are "clicking"
...Spark is ok on cylinder #3 when I switch connector from injector #2 to #3...

If the injectors are functioning, then it must be the spark plug that's not.
How did you determine that spark is okay without using a spark tester?

switched places for injector connector #2 and #3 and got injector/cylinder #3 to work

[grom_e30]

are you set for sequential injection? or batch injection? also

[wewerica]

@grom batch injection
will post tomorrow sorry

[grom_e30]

just out of curiosity are the 2 problem injectors on the same injector channel?

[wewerica]

Problem are injectors #3 & #4, they are on one channel.
Just for test: I've switched places connectors on inj #2 & #3. And got cylinder#3 to work


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[wewerica]

Todays datalog and msq
Not sure how ignition timing is set, I've removed distributer so I will have to check when I get car to work.

[grom_e30]

it sounds like it may be a hardware issue on the injector driver

[wewerica]

it sounds like it may be a hardware issue on the injector driver

Is this all the hardware for injector driver?


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[grom_e30]

pretty much. but do check from the main board that the microsquirt module plugs in to