how much injector leak is too much - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

S13squirrel · 04-23-2005, 10:50 PM

okay so I used the handy search function and learned from your guys how to check for leaky injectors by pulling the fuel rail and then turning the ignition on. This is because lately I have had occasional starting problems, but my starter, battery, alternator, plugs, wires, distributor cap, and rotor are all fine. What happens is my car starts and then immediately dies, then it will not fire at all unless I let it sit for several hours (or push start it). So I did the injector test and none of them were conbstantly spraying or dripping, but I did smell fuel, and injector #4 did seem to let out a couple of drips. It was hard to tell because I did this by myself, so I had to turn the key and then run over to the injectors to look. Is just a couple of drops upon fuel pressurization enough to cause a flooding problem? Is this a cause for concern, or is it likely that my problem lies elsewhere? I don't wanna drop $70 on a new injector if I can help it.

rancid240 · 04-24-2005, 02:57 AM

Check your ECT, check your maf. ECT is easy, follow your radiator hose to the intake manifold and those two sensors, the big one is it. Pull it and see if its dirty, or you can test the resistance per the FSM. Check the MAF also behind the intake. I dont know if a fuel drops is bad or not (you cant perform the same test on KA24E).

Mine had similar problems, I ended up replacing all the injectors but the problem still persisted. Then I cleaned my ECT and it was fine.

S13squirrel · 04-24-2005, 03:33 PM

Okay so I don't think my injectors are leaking after all, after doing a second test, so it must be something else. I looked at the ECT, if that's the little red sensor on the intake mani immediately downstream from the radiator hose. It looked a bit dirty, so I cleaned off both ends of the connector and reattached it.. Then I removed my MAF sensor and that looked perfectly fine on the inside, so clean you can eat off it. What am I supposed to be looking for when I look at my MAF? The connectors look clean, as well as the little filament-looking sensors.

04-23-2005, 10:50 PM	#1
S13squirrel Join Date: Jun 2004 Location: Kentucky Posts: 21 Trader Rating: (0) Feedback Score: 0 reviews	injector leak... ECT.. MAF? okay so I used the handy search function and learned from your guys how to check for leaky injectors by pulling the fuel rail and then turning the ignition on. This is because lately I have had occasional starting problems, but my starter, battery, alternator, plugs, wires, distributor cap, and rotor are all fine. What happens is my car starts and then immediately dies, then it will not fire at all unless I let it sit for several hours (or push start it). So I did the injector test and none of them were conbstantly spraying or dripping, but I did smell fuel, and injector #4 did seem to let out a couple of drips. It was hard to tell because I did this by myself, so I had to turn the key and then run over to the injectors to look. Is just a couple of drops upon fuel pressurization enough to cause a flooding problem? Is this a cause for concern, or is it likely that my problem lies elsewhere? I don't wanna drop $70 on a new injector if I can help it. Last edited by S13squirrel; 04-24-2005 at 03:29 PM..

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04-24-2005, 02:57 AM	#2
rancid240 Post Whore! Join Date: Jan 2002 Location: Irvine CA Posts: 2,770 Trader Rating: (72) Feedback Score: 72 reviews	Check your ECT, check your maf. ECT is easy, follow your radiator hose to the intake manifold and those two sensors, the big one is it. Pull it and see if its dirty, or you can test the resistance per the FSM. Check the MAF also behind the intake. I dont know if a fuel drops is bad or not (you cant perform the same test on KA24E). Mine had similar problems, I ended up replacing all the injectors but the problem still persisted. Then I cleaned my ECT and it was fine.

04-24-2005, 03:33 PM	#3
S13squirrel Join Date: Jun 2004 Location: Kentucky Posts: 21 Trader Rating: (0) Feedback Score: 0 reviews	Okay so I don't think my injectors are leaking after all, after doing a second test, so it must be something else. I looked at the ECT, if that's the little red sensor on the intake mani immediately downstream from the radiator hose. It looked a bit dirty, so I cleaned off both ends of the connector and reattached it.. Then I removed my MAF sensor and that looked perfectly fine on the inside, so clean you can eat off it. What am I supposed to be looking for when I look at my MAF? The connectors look clean, as well as the little filament-looking sensors.