Black Spark plugs and rich afr

[nano]

Hi, my car is running really bad atm. 

It starts well. But idle is rich(Black plugs) and 10afr on brand new aem wideband   and cant accelerate smoothly. In one Word its undrivable.

My attention is on the map sensor.

I get 1.7v on idle with multimètre on pim line when its idling and 2.66v ignition on engine off 

Shouldnt it be around 0.2v when idling ?

Can someone confirm this please.

If so, mean map sensor needs to be replaced? 

Edited August 5, 2018 by nano

[nano]

Ok sorted. Injectors harness is not good.  I used my 2ee one and injectors are all together and in a 4efte they re  seperate 

[Sweg Collowjoekwn]

Did it have a lot of trouble getting past 4k rpm aswell? Mine is having about the same problem, misfiring and running super rich.

[GP82]

Got any fault codes?

[Sweg Collowjoekwn]

Only 24, but nothing else.

[RobSR]

24 is air intake temp sensor signal fault. Intake temp  is very important in a speed density based engine so that will be causing you problems first of all.

[Sweg Collowjoekwn]

Would it cause the engine to run stupid rich? So misfiring because there just is too much fuel? If so I'll get that sorted asap.

[RobSR]

I don’t know what the stock ecu is set at when the sensor fails, usually it’ll fail hot so the ecu will inject fuel for safety. 

Check the wiring etc too. Could be a break in the loom etc.

[Sweg Collowjoekwn]

Connected the IAT, made no difference. However measured continuity over the separate injector wires, they all made continuity. Which does mean all the injectors are connected. Thank you very much for helping though, have checked all the other wires if they actually did something or gave the right values.

[Sweg Collowjoekwn]

Turns out it was indeed the injector wiring, runs fine now! 

[jellybaby]

Least u found the issue tip in future u can have continuity through a single strand of wire it always best to do a resistance check or a volt drop test 

[Sweg Collowjoekwn]

I measured resistance over the wires, thought that was the same as measuring continuity!

[jellybaby]

1 hour ago, Sweg Collowjoekwn said:

I measured resistance over the wires, thought that was the same as measuring continuity!

Nope unfortunately not 

continuity just checks if a current is flowing.  From point a to b 

 

resistance check ya have to have say the injector harness disconnected and the ecu disconnected u then with selected on the ohms setting see what resistance is. 

To check the injector u have to test it disconnected should see a resistance depends on if the high or low injectors 

some will say 14.5 ohms then check the rest and see if there a difference. 
 

 

I rather do voltage drop test on the circuit