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Old 06-29-2013, 03:45 PM   #11
cowman79
 
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Vehicle: 1996 Mustang GT
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fuel trims are calculated and adjusted from the upstream o2 sensor, not the rear.

Since it appears that I have a fuel air problem I guess I will check a little closer for vacuum leaks. The previous owner installed an aftermarket BBK throttle body and a BBK CAI. He didn't install the BBK mass air flow sensor it appears that he reused the factory one. I have already checked the mass air to make sure that it is clean and there was no debris or oil on the wires.


This is a picture of the CAI and throttle body

http://i1146.photobucket.com/albums/...ps63f93dd8.jpg
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Old 06-30-2013, 12:32 PM   #12
art02gt
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Originally Posted by cowman79 View Post
Since it appears that I have a fuel air problem I guess I will check a little closer for vacuum leaks. The previous owner installed an aftermarket BBK throttle body and a BBK CAI. He didn't install the BBK mass air flow sensor it appears that he reused the factory one. I have already checked the mass air to make sure that it is clean and there was no debris or oil on the wires.


This is a picture of the CAI and throttle body

http://i1146.photobucket.com/albums/...ps63f93dd8.jpg
a mass air fault would cause both banks to run rich/lean. you have a bank specific problem. since you're running rich it could be a leaky injector on bank 1 or maybe something clogged that won't let proper airflow in to a cylinder in bank one. it is very rare, but maybe your upstream o2 could be at fault. or even rarer, it could be your pcm. I worked on an f-150 with your problem. I took the injectors out and turned the key on (engine off) and injector #2 would slowly start to form a little drop of fuel (leaking), BUT as soon as I would electronically disconnect the injector the leaking would stop. so it was a pcm problem. if it would have continued to leak disconnected, then it would have been a bad injector.
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Old 06-30-2013, 05:18 PM   #13
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I've never worked on injectors like this before can you lift them all off while connected to the fuel rail and perform the test you are talking about. Also how do you test these injectors. Or is there a certain lifespan for these Injectors. The car has about 150k on it.
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Old 06-30-2013, 07:42 PM   #14
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I've never worked on injectors like this before can you lift them all off while connected to the fuel rail and perform the test you are talking about. Also how do you test these injectors. Or is there a certain lifespan for these Injectors. The car has about 150k on it.
you can remove the fuel rail with the injectors still on it. just make sure they are still seated in to the rail when you turn the key on or the fuel pressure will pop them out of the rail. and remember you are only turning the key on DO NOT crank the engine. See if you can actually get some proper o2 readings first, I usually leave these kind of tests for last.
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Old 06-30-2013, 07:45 PM   #15
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I will check the o2 volts tomorrow. I though they were running around the same as bank 2. maybe .7 volts
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Old 06-30-2013, 07:47 PM   #16
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When I was watching the switching on the graph it appeared the there was a little bobble at the top of the sine wave on bank 1. The bobble wasn't there all of the time but occasionally I saw it. Not sure what caused that.
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Old 06-30-2013, 07:47 PM
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