O2 and MAF OBD data specs needed
#21
08-07-2011, 10:51 PM
Response to SPARKENGAP
RESPONSE FROM MAT:
I have been wondering about the fuel injector positioning with the bottom o-rings. I placed all of the injectors in the fuel rail first and then pushed the injectors into the manifold on both sides of the car. Who knows if the bottom O-rings did not sit. I was concerned about the upper O-rings sealing for fuel. The only way to see if the fuel injectors fully-seated would be as you said remove the fuel injector manifold from the intake manifold and look underneath. Hopefully then re-seating each injector back into the fuel rail will not pull up the injector to unseat the bottom O-ring. The air bypass could be there. But I would think it should not affect it the vacuum to much since it is a sealed chamber if the top and middle gaskets seal. Let me get up the courage to again remove all of the injectors. order gaskets for the fuel injector manifold and lift it up.
<<<Mathew>>>
I have been wondering about the fuel injector positioning with the bottom o-rings. I placed all of the injectors in the fuel rail first and then pushed the injectors into the manifold on both sides of the car. Who knows if the bottom O-rings did not sit. I was concerned about the upper O-rings sealing for fuel. The only way to see if the fuel injectors fully-seated would be as you said remove the fuel injector manifold from the intake manifold and look underneath. Hopefully then re-seating each injector back into the fuel rail will not pull up the injector to unseat the bottom O-ring. The air bypass could be there. But I would think it should not affect it the vacuum to much since it is a sealed chamber if the top and middle gaskets seal. Let me get up the courage to again remove all of the injectors. order gaskets for the fuel injector manifold and lift it up.
<<<Mathew>>>
Mathew:
Do I remember correctly that you have had the fuel injectors out to test? If that is right, I suggest you take the manifold off, and the fuel injector assemblies and check for a pinched o-ring or gasket. It will go much quicker the second time you do it and cost much less than the garage will charge. And it will probably lead you to the problem. Another method to find a \leak is to watch the stft numbers while "spraying" the gas from an UNLIT propane torch around the intake plenum. When the engine begins sucking propane instead of air, the trim numbers will take a dive down. The O2 sensor voltage will rise.
Do I remember correctly that you have had the fuel injectors out to test? If that is right, I suggest you take the manifold off, and the fuel injector assemblies and check for a pinched o-ring or gasket. It will go much quicker the second time you do it and cost much less than the garage will charge. And it will probably lead you to the problem. Another method to find a \leak is to watch the stft numbers while "spraying" the gas from an UNLIT propane torch around the intake plenum. When the engine begins sucking propane instead of air, the trim numbers will take a dive down. The O2 sensor voltage will rise.
#22
08-08-2011, 04:57 AM
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