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View Full Version : KA/DE FI system problem.


Darkgrey240
12-20-2004, 08:36 AM
Ok, here's the deal:

My car's motor would shake sometimes with an extreme lose of power. It felt like the car was running on 3 cylinders. I replaced plugs, wires, cap and rotor, fuel filter( 300zx tt). Nothing worked. I had the motor compression tested also with results being 181, 184(problem cylinder, will expain), 179, 180. All this on a 200K mile motor. I was happy with that but the car still did it randomly. It could be running fine then all of sudden start shaking then go back to normal. When the motor was doing that I pulled each plug out to see if that would make any difference, sure enough #2 did nothing when I pulled it out. I changed the plug just incase and it was fine for 5 minutes but went back to its old antics. I figured it was the fuel injector. Since me not having time I brought the car to a local gas station to replace the injector( What harm could be done? Injectors are easy to replace) with an autozone one. Well, harm was done. The guy calls me and told me it's still doing the same thing. I am confused at this point and don't know what to do. I take my car and drive it another gas station to get gas( sunoco sucks) well when I get there my car just completely dies, it just turns over and smokes. The injector flooded my motor!!!!WTF. I have the car towed back there. I am really pissed at this point. Why would a NEW injector be WORSE then the old? We both figured it was a shot injector, so I go to nissan and luckly they have one left. So I bring it to where my car is and the guy tell's me he will call me when it is done. ( saturday) He never calls me. My mom ended up going down there and another guy said my car is still having the same problem( not the mechanic, he just decided to leave without calling me) to leave it there till monday. Well this morning comes around and I call him and he tells me to come pick up my car he can't figure out whats wrong, and here we are, monday morning. My car is now sitting in my back yard and it doesnt fuckin run. I can smell the gas fumes hardcore around the car. I am lost on what to do.

He mentioned that he pinched the fuel line and it started to smooth out. Maybe the fuel pump? What else can it be? I am pissed and confused. I dont see why my car is running worse since this douche-bag touched it. Someone help me!

Thank you,
John

Darkgrey240
12-20-2004, 06:27 PM
Can anyone help me?

PinkPanther
12-20-2004, 06:38 PM
make sure you have a full tank of gas and then test the system at the fuel filter for flow and pressure, during engine operation. The shadetree gas station mechanic probably fucked up the injector O-rings during replacement-they are very sensitive to careless installation.

IvanAtSPRacing
12-20-2004, 07:37 PM
Did you ohm the bad injector? Normal ohms should be 12.5 or so. More then 14 ohms and its bad. I would suspect your injector was bad. I would suspect the install of the new injectors was poor. I would second the suggestion that the injector O-ring is jacked. It would be pretty simple for you to pull the injector out and check for yourself. There will be two O-rings, a large one towards the top of the injector and a small one towards the bottom. I would suggest the bottom one is damaged.

Darkgrey240
12-20-2004, 09:20 PM
I replaced the #2 injector with a brand new nissan one. I really dont know what he could have done to make my car worse.

Also, It is going to be hard to check fuel pressure and flow while the engine is running, since it doesnt even want to start anymore.

No Ivan, I did not check the OHM on the bad injector, which I should have done before anything. My mistake. This week when I find some time I am going to make sure I am getting good spark also. I have a Walbro 255lph pump here, that I was going to use for my turbo, but if need be I will install in now.

Darkgrey240
12-26-2004, 09:10 AM
Just for future reference, it was the O-rings. Thanks to guys that helped me!