Problem:

My last d16z6 blew because cylinder 2 leaned out so when I swapped a new d16 in (using same fuel rail and injectors from the blown motor) i listened to the injectors. Just as i suspected, injector 2 sounded different (clicking is not as pronounced as other injectors) so I thought it would be an easy fix and ordered a new injector.

I got the new injector, put it in today BUT it still sounds different like the old "bad" injector. Sure enough, i took it for a drive and when the motor really needs all the fuel it can get (full boost and high revs in vtec) i feel the same hesitation again.

Why would this injector not be firing as well as the others?

Anyone had this problem?

I know if I don't figure this out it's gonna lead to another blown motor.

 

what injectors? check your wiring.

 

racetronix 42 lb/hr, wiring looks alright...it still works, the pulse just isnt as strong.

 

Is the car tuned?

Definitely check the wiring.

 

yeah tuned on crome, im gonna go through the wiring tomorrow.

 

Has the car ever run well on the tune?

 

Yeah ran perfect for over a year then started hesitating, which lead to the motor blowing, now trying to figure out the issue before it blows again

 

Try swapping the ECU - the injectors are powered by dual transistor banks, 1 per set of 2 injectors, which can go bad. Next time swap your injectors before buying a replacement to see if the problem "moves" with the injector ;-)

 

is there a way to check the transistor banks?

i just did a power check, each plug is sending 13.1x volts to the injector and each injector has 17 ohms of resistance on a 2000 scale... the injector on cylinder 2 still sounds different from the other 3. i'm stumped.

 

You will see 12v on the injector plugs but the ECU actually grounds them to pulse them - not the other way around so your best bet is to still run another ECU in your car or your ECU in another car.

 

changed the ecu, still having the same issue. also checked the voltage at the ecu, its fine as well.

 

it was the distributor!! thanks for your help guys