Skip the auto shop - Our mechanics make house calls

Q: Repeated Fuel Injector Seal Failure

asked by on

I've got a p0302 code, misfire on cylinder 2. Changed the spark plugs, wires, and coil pack to no avail. Pulled the number 2 injector and swapped it with one I pulled at a salvage yard. Problem was fixed for about 50 miles, car ran great, no misfire. Then code came up again with a rough idle and gas smell. Pulled the injector and the upper o ring had ripped. Repeated this 4 times. I'm using OEM o rings from injectors I'm getting at the yard, but they keep failing. I really want to know the underlying cause for all these failed o rings before I swap any more. Any ideas?

My car has 190000 miles.
My car has a manual transmission.

A: O-rings on fuel injectors have to be libera...

O-rings on fuel injectors have to be liberally lubricated with engine oil prior to installation. Installation is typically made with a twisting motion as you push the injector into the bore on the fuel rail. Be sure the aluminum surface (bore) in the fuel rail appears polished and perfectly smooth with no nicks. If you install with engine oil and use a twisting downward motion you should have no problem. If you want to have this checked, or would like to have an expert install new injector o-rings for you, a certified pro from YourMechanic can come to your home or office to perform this.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Won't start - not getting fuel into the injectors

Hey there, thanks for writing in. Lack of fuel pressure here often points out a clogged fuel filter. I would have an experienced technician inspect the fuel system and check pressure at the fuel feed line under the hood. The...

Q: Obd1 code 45 car miss firing and stalling

The carburetor on these cars have a mixture control solenoid that goes bad and I would suggest replacing the solenoid if you got a Code 23 with or without Codes 44 and 45. Since you overhauled the carburetor, the adjustment...

Q: Car starts very weakly after filling up with gas.

Hello and thank you for contacting YourMechanic. Sometimes the gas cap vent tends to get stuck shut making the fuel system go into a vacuum. Check the gas cap for the seal to ensure that it is sealing. Make sure...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...