Pulled spark plugs - possible leaking injectors
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Joined: Jun 2007
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Pulled spark plugs - possible leaking injectors
So I pulled my spark plugs today hoping to find out why my gas mileage have been so poor lately. When I pulled out cylinders 5, 7, 4, and 6 spark plugs, there was a very strong smell of gas with lots of carbon deposits on the plugs end were visible. So I'm pretty sure that those injectors are leaking when the car sits. Am I right? I think there are newer style replacement injectors that will handle the ethanol better that's in the gas now, what are these called? Since I will eventually have the upper part of the engine apart to replace the injectors, are there performance packages that include better flowing plenum/runners, intake manifold, and injectors that I can get? I thought I saw them somewhere. Thanks!!
Burning Brakes
Joined: Feb 2008
Posts: 988
Likes: 7
From: Sarasota Fl
So I pulled my spark plugs today hoping to find out why my gas mileage have been so poor lately. When I pulled out cylinders 5, 7, 4, and 6 spark plugs, there was a very strong smell of gas with lots of carbon deposits on the plugs end were visible. So I'm pretty sure that those injectors are leaking when the car sits. Am I right? I think there are newer style replacement injectors that will handle the ethanol better that's in the gas now, what are these called? Since I will eventually have the upper part of the engine apart to replace the injectors, are there performance packages that include better flowing plenum/runners, intake manifold, and injectors that I can get? I thought I saw them somewhere. Thanks!!
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
A fuel pressure test will rule out or confirm the problem - if it's normal, the other cause would be an inoperative evaporative emission control system. A check valve should be holding fuel vapors in the tank when it's stopped. If it's failed or if the canister if full of fuel, vapors can enter the plenum and find their way through an open intake valve. Your sniffer test only tells you something is up - you need to find out what's causing it.
