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Registered
Join Date: Sep 2015
Posts: 656
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911 SC loose fuel injector?
Found this issue while doing my plugs. Google searched, searched pelican and read my Bentley. Couldn't find an answer or solution. Is there an oring or something missing??
https://youtu.be/PC1tJ3VOnlk
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‘70 911E ‘82 911 SC Targa ‘86 944 Turbo ‘90 OM606 Swapped SWB 300GD IG: @JackSchroederCreative |
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10-06-2017, 03:07 PM
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Reiver
Join Date: Nov 2011
Posts: 57,376
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I don't know the answer but am interested in what it might be from our friends here.....hazarding a guess...if the plugs all look alike it appears it is sealing...
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10-06-2017, 03:19 PM
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Registered User
Join Date: May 2012
Posts: 139
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The injectors sit in a plastic sleeves with an o-ring to seal, and this assembly is staked into the aluminum runner with three little square "punches" around the top edge. There's also an o-ring between the housing and the aluminum runner (you can see this one in the attached pic) So your loose injector is either bad o-ring(s), or the assembly is loose in the housing itself.
Let the car sit overnight and loosen and remove the metal fuel line and see if you can pull the injector out by hand. You should be able to see what's going on by doing that. cheers 
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10-06-2017, 04:07 PM
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Join Date: Jul 2012
Location: Mississippi
Posts: 2,354
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Quote:
"The Tooth" told me don't worry, they are held in place by engine vacuum. |
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10-06-2017, 04:27 PM
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Reiver
Join Date: Nov 2011
Posts: 57,376
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Quote:
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10-06-2017, 04:30 PM
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Join Date: Jul 2012
Location: GA
Posts: 919
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That's a very common problem and just comes with age. The o-rings and the phenolic seats fail over time and that loose one will probably be leaking air causing a lean condition with your fuel mixture.
I removed my entire CIS from the top of the engine and replaced all the sleeves, o-rings, runner gaskets, mounts (sagging) and vacuum lines because all of mine were leaking. I found my air box had also failed on the bottom glue seal so I replace that too. Slippery slope. If you remove the fuel line and just pull on the injector then the whole thing will probably just pop right out. Then you can just replace the sleeve and o-rings. The safest thing to do is remove the runners and tap them out by hand from the intake side of the runner. Careful because if the sleeve is really perished and you pull on it then you risk it crumbling apart and dropping pieces into the intake. In my experience I didn't need to bother with the staking. All of mine just popped right out tapping from behind on the bench and I installed the new ones past the stakes with some petroleum jelly. Some of the seat peeled off where it scraped against the stake during the install but it didn't affect the seal at all. It's not hard to remove the CIS. It just takes some time. If you do a partial drop it's not bad at all. It's possible without a partial drop but it's a tedious back breaker. Here's the thread that documented the last time we went through this --> Air leakage from intake manifold sleeves If you can easily drop the engine it's a very easy job to R&R the CIS. Last edited by gazzerr; 10-06-2017 at 04:43 PM.. |
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10-06-2017, 04:31 PM
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