replaced fuel injector failled. bad piston? help??! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

ipodfreak93gh · 11-21-2012, 05:07 AM

Hey guys I’m having a problem with my ka24dei recently have had a misfiring problem going on with my car like in the video:
1991 nissan 240sx engine shake problem - YouTube

And I would get very little power from the engine and shaky car while at an idle.

So I thought it would be something spark related so I replaced the spark plugs with new ones and had the same problem,

Then I thought it could be something with the fuel-line, so I pulled out the electrical connections from the fuel injectors while the car was running. And the first two made the rpm die down like expected, but the third one didn't do a thing so I thought bad fuel injector.

So after that I replaced the third fuel injector with a new one and my car ran great with full power again and even stopped shaking. Then I went to the store and it started shaking again not even 3 miles in. so I popped the hood and take the recently replaced injector out and notice its all wet with a lot of gasoline and the bottom seal is broken.

I replace the bottom seal ring with the old fuel injector and put it back in. the car works great again and drive it far like a 40 min drive and it starts doing the same thing again.

Then again I take out the replace injector and the seal is broken again. So I think its a bad injector with wrong timing of fuel. So I go get another fuel injector and replace it with the one with the broken seal. I try to start the car but its very flooded so I turn the key hold for 10 sec and etc. I get the car unflooded and started!

Finally I think the car is fixed and was all due to the bad injector, which I replaced it with. The car runs smooth and has full power. It runs great for another 40 min drive. Then I get the shaking problem again but still have full power. The engine smelled like gasoline and when I turn it off then on it barely started.

SO NOW I’m stuck. And I think it might be a bad piston. What do you guys think?

Croustibat · 11-21-2012, 06:14 AM

If you keep frying injectors, i would take a look at your wiring and your ECU (the injector driver is in the ECU).

If your car is overfueling, i'd say :
1/boost leak
2/mapping not adapted to the current injector / MAF setup

11-21-2012, 05:07 AM	#1
ipodfreak93gh Leaky Injector Join Date: Oct 2012 Location: california Posts: 99 Trader Rating: (2) Feedback Score: 2 reviews	replaced fuel injector failled. bad piston? help??! Hey guys I’m having a problem with my ka24dei recently have had a misfiring problem going on with my car like in the video: 1991 nissan 240sx engine shake problem - YouTube And I would get very little power from the engine and shaky car while at an idle. So I thought it would be something spark related so I replaced the spark plugs with new ones and had the same problem, Then I thought it could be something with the fuel-line, so I pulled out the electrical connections from the fuel injectors while the car was running. And the first two made the rpm die down like expected, but the third one didn't do a thing so I thought bad fuel injector. So after that I replaced the third fuel injector with a new one and my car ran great with full power again and even stopped shaking. Then I went to the store and it started shaking again not even 3 miles in. so I popped the hood and take the recently replaced injector out and notice its all wet with a lot of gasoline and the bottom seal is broken. I replace the bottom seal ring with the old fuel injector and put it back in. the car works great again and drive it far like a 40 min drive and it starts doing the same thing again. Then again I take out the replace injector and the seal is broken again. So I think its a bad injector with wrong timing of fuel. So I go get another fuel injector and replace it with the one with the broken seal. I try to start the car but its very flooded so I turn the key hold for 10 sec and etc. I get the car unflooded and started! Finally I think the car is fixed and was all due to the bad injector, which I replaced it with. The car runs smooth and has full power. It runs great for another 40 min drive. Then I get the shaking problem again but still have full power. The engine smelled like gasoline and when I turn it off then on it barely started. SO NOW I’m stuck. And I think it might be a bad piston. What do you guys think?

11-21-2012, 06:14 AM	#2
Croustibat Nissanaholic! Join Date: Aug 2011 Location: France - Toulouse Age: 44 Posts: 1,851 Trader Rating: (0) Feedback Score: 0 reviews	If you keep frying injectors, i would take a look at your wiring and your ECU (the injector driver is in the ECU). If your car is overfueling, i'd say : 1/boost leak 2/mapping not adapted to the current injector / MAF setup