1G injectors problems?

[asd_gst]

ok i changed my fuel pump, fuel filter, and cleaned the fuel system, i had dirt in my gas from a gas station, so i think it messed up my injectors, i have a walbro 190 and brand new fuel filter, and that car runs lean i hooked it up to my data logger, if i put octane booster in it it runs a little better so im thinking that the motor isnt getting enojgh gas, so i think injectors since ive upgraded everything else i can think of

 

[->PrOjEcTGS<-]

Why are you so convinced it's running lean? What does the o2 sensor read? Have you replaced that recently? It could be going out. What do all of your fuel trims read? Is your 190 rewired? It's possible your not getting the proper voltage to your pump.

 

[asd_gst]

ill have to show you what it logged, but i showed the guy who sold me and he said it had a lean spot, but no it hasnt been rewired, im new to the whole tunning and electronics, so can i tell if the o2 is going bad by the data logger?

 

[->PrOjEcTGS<-]

Yes, if your O2 sensor is going out it will read a low voltage on the logger. But that will force the ECU to richen things up since it thinks it's running lean. So, have you been getting bad gas mileage? If so I believe you may have a dead O2 sensor.

 

[asd_gst]

yea i havent been getting good milage at all, what is low volts? ill check it when i go out tomorrow

 

[asd_gst]

ok this is what the logger reads, idk how to get it on here so i have to type it out
2781rpm knock 0 timing 37 deg o2 0.76 volts throttle pos. 19%
3812rpm knock 1 timing 29 deg o2 0.67 volts throttle pos 42%
4437rpm knock 14 timing 18 deg o2 0.86 volts throttle pos 68%
4625rpm knock 21 timing 10deg o2 0.86 volts throttle pos 67%
4750rpm knock 16 timing 37 deg o2 0.86 volts throttle pos 9% (i let off)
then
4187rpm knock 0 timing 17 deg o2 0.88 volts throttle pos 74%
4812rpm knock 0 timing 18 deg o2 0.86 volts throttle pos 64%

if you want anymore imformation such as air flow or fuel trim let me know

 

[->PrOjEcTGS<-]

When did this problem start? How did you get dirt in your gas tank? Do you know anyone else with a DSM? You can swap parts back and forth to find the problem. Here are some things to check:

O2 Sensor: What does it read at idle? Does the voltage fluctuate back and forth from about .06v - .78v

MAS: Swap it out with a friend's sensor. It giving a bunk reading will throw off your O2v.

Injectors: You already suspect the injectors. Why not swap them out with some known good ones.

Fuel pump o-ring: The o-ring that goes on the top of the pump into the line sometimes if you're not careful can get lodged incorrectly and leak back into the tank.

FPR: The Fuel Pressure Regulator could have went bad. Check the vacuum line that runs to it. If the vacuum line is disconnected you will run lean on the top end since it won't have a boost reference. If that's not the case swap it out with a known good one preferably a NT one. (Higher Fuel Pressure.)

ECU: Pull the ECU out and check for leaking capacitors. When you open it up it might smell like seafood indicating something is not right.

 

[asd_gst]

i filled up at the gas station, the pump was really slow then my car ran really bad, i took it out to my brothers shop were he works he said that the gas tank might have had a crack in it, he said he has people come in all the time when they get bad gas or gas with dirt or water in it from gas stations... i was talking to the person who sold me the datalogger he said that "my ignition timing is off and you can see timing is a little high, and the o2 is wayy lean at .67"

 

[->PrOjEcTGS<-]

I would double check your base timing then. It should be set to 5 degrees BTDC. And on a stock car your timing curve should start at about 17 deg at WOT and end up at about 20-21 deg by redline. That is if there is no knock. BTW, how much boost are you pushing?

 

[asd_gst]

honestly i dont know, the guy i bought the car from did a bcs removal, i have a autometer boost gauge dont, but i dont have any thing to mount it in. so i have no clue, a little more then stock

 

[->PrOjEcTGS<-]

Well, you need to find out the amount of boost you are running just to make sure you aren't too high. I doubt that's the problem but it's a crucial thing to know. I would check all those things mentioned before and then let us know where you are at. Shoot, even your knock sensor could be going out also giving a false reading.

 

[asd_gst]

so check my timing, figure out my boost? and my knock sensor?

 

[->PrOjEcTGS<-]

O2 Sensor: What does it read at idle? Does the voltage fluctuate back and forth from about .06v - .78v

MAS: Swap it out with a friend's sensor. It giving a bunk reading will throw off your O2v.

Injectors: You already suspect the injectors. Why not swap them out with some known good ones.

Fuel pump o-ring: The o-ring that goes on the top of the pump into the line sometimes if you're not careful can get lodged incorrectly and leak back into the tank.

FPR: The Fuel Pressure Regulator could have went bad. Check the vacuum line that runs to it. If the vacuum line is disconnected you will run lean on the top end since it won't have a boost reference. If that's not the case swap it out with a known good one preferably a NT one. (Higher Fuel Pressure.)

ECU: Pull the ECU out and check for leaking capacitors. When you open it up it might smell like seafood indicating something is not right.

And all of these things.

 

[asd_gst]

i know for a fact my ecu is good just bought it, my old one was leaking