leaky fuel injector...?? where from
Thread Starter
Instructor
Joined: Jul 2004
Posts: 186
Likes: 1
From: ny
leaky fuel injector...?? where from
i got my intake manifold all abck on and assembled.... started it up..
and i ahv e apuddle of fuel between #4 and #6 cylinders.... im pretty sur eits #4 injector, bu tit looks like its backing up out of the lower hole... i dont see how this is possible... so i guess it must be from the top right?
any other option besides taking the plenum and fuel rail back off and checking it out? i did replace one injector, but if its pooling when the car is off and not into the chamber, but pooling on the manifold then it is prob the upper o-ring (which i just replaced) right? i had hte car runnign with the exhaust off and jsut manifold so im really sure all are firing...
also do i have to worry about that gas harming my brand new intake manifold gaskets?
tj
and i ahv e apuddle of fuel between #4 and #6 cylinders.... im pretty sur eits #4 injector, bu tit looks like its backing up out of the lower hole... i dont see how this is possible... so i guess it must be from the top right?
any other option besides taking the plenum and fuel rail back off and checking it out? i did replace one injector, but if its pooling when the car is off and not into the chamber, but pooling on the manifold then it is prob the upper o-ring (which i just replaced) right? i had hte car runnign with the exhaust off and jsut manifold so im really sure all are firing...
also do i have to worry about that gas harming my brand new intake manifold gaskets?
tj
Racer
Joined: Aug 2004
Posts: 379
Likes: 170
From: Buffalo Grove IL
Yeah, sounds like the o-ring on top of the fuel injector isn't sealing correctly. Maybe the injector itself has an external leak? I've heard the early Bosch injectors (which I believe are on your '85) can develop external leaks, but I haven't heard of anyone on the forum with that problem.
I'm not sure what else you could do other than pull off the fuel rail and check it
Also, I don't think it would hurt your intake manifold gasket.
Ben
I'm not sure what else you could do other than pull off the fuel rail and check it
Also, I don't think it would hurt your intake manifold gasket.Ben
Thread Starter
Instructor
Joined: Jul 2004
Posts: 186
Likes: 1
From: ny
i was told all i should use was pb blast... so i put them in a bag sprayed it in and took them out one at a time... i guess we will see when i take it apart... i just hope its not the injector...
can you get the plenum and runners off together? i dont think you can...
tj
can you get the plenum and runners off together? i dont think you can...
tj
Racer
Joined: Aug 2004
Posts: 379
Likes: 170
From: Buffalo Grove IL
Some engine oil on the o-rings helps during reassembly 
You can get the injectors out by just pulling the plenum off and then disassembling the fuel rail to get the injectors out. Sam Lam has a good doc on doing this.
Ben
You can get the injectors out by just pulling the plenum off and then disassembling the fuel rail to get the injectors out. Sam Lam has a good doc on doing this.Ben
Thread Starter
Instructor
Joined: Jul 2004
Posts: 186
Likes: 1
From: ny
well its not the upper o-ring... i ahve two leaky injectors... both seem to leak from abive the lower o-ring and up out of the injector hole in teh manifold...
any way to fix leaky ones?
tj
any way to fix leaky ones?
tj
