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injectors rattling??????

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Old 07-11-2007 | 06:59 PM
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kowboy59's Avatar
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From: kissimmee fl
Car: 88 iroc-z z-28
Engine: 383
Transmission: th400
Axle/Gears: 3.42
injectors rattling??????

When I took out my injectors to get 2 of them replaced, I realized that all my other ones rattle where the nozzle is I guess? I'm not sure what to call it but its at the bottom where the injector shoots into the mainfold. Here's a link to show what I'm talkin bout. It's internally the bottom part. http://www.efi101.com/img/injector-diagram-vertical.gif

well thanx fo helping me in advance
Old 07-11-2007 | 09:34 PM
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Re: injectors rattling??????

Can you twist that lower piece while holding the injector. I have run across many that the crimp somes loose and eventually it causes a fuel leak onto the manifold.
Old 07-11-2007 | 10:50 PM
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From: kissimmee fl
Car: 88 iroc-z z-28
Engine: 383
Transmission: th400
Axle/Gears: 3.42
Re: injectors rattling??????

well none of them were leaking except the 2 that I have fixed. I was just nervous if they were all gonna go on me. They aren't twisting when I do what you said to do. The nozzle thing on the bottom of the internals are all brown and stuff. Is that okay?

Last edited by kowboy59; 07-11-2007 at 10:57 PM.
Old 07-12-2007 | 09:53 AM
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Car: '91 Z28 convertible
Engine: TPI
Transmission: T5
Axle/Gears: 3.27 posi disc
Re: injectors rattling??????

They should not rattle, they should be pushed in tightly. They have two O-rings, one for the manifold and one for the fuel rail. The injectors should have no play. I mean, you might be able to turn them slightly but not wiggle them left-right in the hole or up-down.
I'd check the lower O-rings (in the intake manifold). If they are shot, you'd have a hell of a vacuum leak.

Lou
Old 07-12-2007 | 02:17 PM
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From: kissimmee fl
Car: 88 iroc-z z-28
Engine: 383
Transmission: th400
Axle/Gears: 3.42
Re: injectors rattling??????

It's not the exterior thats rattling. its the internals that rattle. If you look inside you can actually see them rattle very slightly. I'm wondering if they are going because my two front ones lost the whole internals. the car also previously was shot with nitrous. So I'm wondering if theyre burnt up or sumtin
Old 07-12-2007 | 02:19 PM
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From: Austin, Tx
Car: 2005 Pontiac GTO
Engine: 364ci LS2
Transmission: 6 speed
Axle/Gears: 3.46
Re: injectors rattling??????

they arent the stock injectors? they might just be done for... i would assume that if 2 of your injectors came apart internally that all the other 6 are going to go as well
Old 07-12-2007 | 02:23 PM
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From: kissimmee fl
Car: 88 iroc-z z-28
Engine: 383
Transmission: th400
Axle/Gears: 3.42
Re: injectors rattling??????

This sucks. haha Well I was figuring this is what happened. I'm thinkin bout buying the venom injectors. They seem a good price and I have heard good things bout them. I am tempted to buy the Autozone brand, but i figured they wont be too great performance wise, because I will be porting my intake after I recoop from this injector thing
Old 07-12-2007 | 02:23 PM
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Car: '91 Z28 convertible
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Axle/Gears: 3.27 posi disc
Re: injectors rattling??????

Sorry, I misunderstood your post.
They should not rattle if you shake them. And when they're injecting, they make a ticking/clicking sound.

Hope this helps a bit.
Lou
Old 07-12-2007 | 03:35 PM
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From: kissimmee fl
Car: 88 iroc-z z-28
Engine: 383
Transmission: th400
Axle/Gears: 3.42
Re: injectors rattling??????

ya thanx alot guys. the internals are rattling when I shake em. Time for new injectors. What is bad is I just bought this car bout 2 months ago. Well I stole it practically when I bought it.
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