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2002 Corolla fuel injector o-rings keep breaking


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N.A.K.
New User

Aug 11, 2016, 5:40 AM

Post #1 of 2 (1460 views)
2002 Corolla fuel injector o-rings keep breaking Sign In

Car info:
2002 Toyota Corolla
4cyl/1.8L
~280,000 miles

So, a few weeks ago, I took out the fuel injectors to test the resistance as part of cylinder misfire troubleshooting. However, after putting it back together, I've had continuous problems with the fuel injector on cylinder four. The small rubber o-ring at the top of the fuel injector keeps tearing either after I put it in, or when I start the car (unsure). I've broken 3 or 4 o-rings trying to get this right. I've tried lubricating them and not lubricating them. I've done it as gently as I can. But I keep getting fuel gushing out as soon as I start the car, and when I take it apart again the o-ring is shredded. I didn't have this problem with any of the others. Is there a special technique or something to make sure this doesn't happen? I wasn't able to find anything specifically about this elsewhere on the internet.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 11, 2016, 5:59 AM

Post #2 of 2 (1457 views)
Re: 2002 Corolla fuel injector o-rings keep breaking Sign In

First make sure there are no pieces of the old one stuck in the fuel rail. The use a new O-ring and put a little silicone based grease on it, not regular grease. Make sure there is not dirt on either part.

I don't know why you removed them in the first place. they can be tested right in the car.



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