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Old 07-18-2004, 00:19   #1 (permalink)
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Left hand bank running rich?

Replaced all spark plugs earlier this morning. Four drivers side plugs were light grey, but the four plugs that came off the pasenger side were black. Does this mean that the passenger side bank of cylinders are running rich? can this be possible?
I thought the fuel delivery was all one system, ie: one fuel rail for all eight injectors.
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Old 07-18-2004, 00:27   #2 (permalink)
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Re: Left hand bank running rich?

It's the one fuel rail, however you have an oxy sensor for each bank. Possible one sensor is buggered, but at $150, don't go ripping it out on my advice.
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Old 07-18-2004, 00:32   #3 (permalink)
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Re: Left hand bank running rich?

Yeah sounds like a stuffed oxygen sensor to me.
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Old 07-18-2004, 00:48   #4 (permalink)
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Re: Left hand bank running rich?

Quote:
Originally Posted by psycho chicken
It's the one fuel rail, however you have an oxy sensor for each bank. Possible one sensor is buggered, but at $150, don't go ripping it out on my advice.
If it's one fuel rail for all 8 injectors, how can one buggered O2 sensor make it's bank run rich? Sorry I'm not disagreeing with you, just looking for more info.
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Old 07-18-2004, 00:51   #5 (permalink)
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Re: Left hand bank running rich?

I'd say the left O2 sensor is giving a lean signal, so the ECU ups the output for the left bank.
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Old 07-22-2004, 18:07   #6 (permalink)
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Re: Left hand bank running rich?

On mine I have 2 fuel rail lines and a return line
One to the left bank and one to the right bank
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