Can you determine the richness of an individual cylinder?

[vancouverbc]

I disconnected the electrical connector at fuel injector(one-by-one) and got the following voltage readings at O2 sensor. When I disconnected the two worst injectors at the same time, I got a lean condition. These were the two injectors closest to the fuel regulator. Im not sure if this means anything.

1) .870 volts at the o2 sensor(cylinder 1 disconnected)2) .870 volts (cylinder 2 disconnected)3) .730 volts (cylinder 3 disconnected)4) .808 boltsThe biggest drop in richness occurred when I disconnected the electrical connector to third fuel injector. when I disconnected the two worst injectors, the reading was steady at .130 which is lean. When I disconnected the two best injectors, the reading was around .560 and was climbing very slowly.

[PapaSmurf2k3]

soo... you just answered your own question? The only other way I could think of would be to take off your exhaust mani and see which cylinder had tons of fuel coming out... which would be very dangerous... and lots of flames would shoot out. In other words, make sure you have lots of beer around when you do it!

[Florida240sx]

Have oyu ran seafoam through your system to try to clean things up?

[vancouverbc]

If I disconnect the injectors for cylinder 1 and 2 at the same time, I get a rich condition of around .550 but if I disconnect 3 and 4 I get a lean condition of under .200.

[psi240]

soo... you just answered your own question? The only other way I could think of would be to take off your exhaust mani and see which cylinder had tons of fuel coming out... which would be very dangerous... and lots of flames would shoot out. In other words, make sure you have lots of beer around when you do it!

http://www.youtube.com/watch?v=i-rID0vPWDI

can u tell which cylinder'S have 50 compression ? lol u cant tell anything by this

[PapaSmurf2k3]

http://www.youtube.com/watch?v=i-rID0vPWDI

can u tell which cylinder'S have 50 compression ? lol u cant tell anything by this

no, but if you run it briefly, and then see which cylinders are pissing fuel out of them (more than the others), you can tell.

I've done it. Besides... who said anything about compression?

[bruinbear714]

Unfortunately that doesn't tell you much. The O2 is a slow responding sensor, and the fuel injector signal is a PWM based signal. Also, the ecu runs in a close-loop system with the O2 readings.

You can't really infer anything from the measurements below.

I disconnected the electrical connector at fuel injector(one-by-one) and got the following voltage readings at O2 sensor. When I disconnected the two worst injectors at the same time, I got a lean condition. These were the two injectors closest to the fuel regulator. Im not sure if this means anything.

1) .870 volts at the o2 sensor(cylinder 1 disconnected)2) .870 volts (cylinder 2 disconnected)3) .730 volts (cylinder 3 disconnected)4) .808 boltsThe biggest drop in richness occurred when I disconnected the electrical connector to third fuel injector. when I disconnected the two worst injectors, the reading was steady at .130 which is lean. When I disconnected the two best injectors, the reading was around .560 and was climbing very slowly.

[vancouverbc]

I dont have the O2 sensor hooked to computer. With all 4 injectors operating, i get a rich condition of .95 volts. As long as I keep the O2 sensor clean, I think i get good readings. If I just let idle, the O2 sensor gets covered in carbon and starts reading lean by at least .2 volts. The reading is instantaneous. HOw does pulse width monitor affect me?