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Post by digdaddy on Jul 30, 2014 12:24:57 GMT -6
it all started with a P0131 O2 Sensor Circuit Low Voltage Bank 1 Sensor 1 code. in the last two months it has not left the drive way as soon as it is put into drive and any throttle it applied it bogs down and starts to back fire, most of the time it runs fine in park. can hear what sounds like a vacuum leak while engine idle but cannot locate.thank you for and help in advance.
everything that has been replaced/inspected:
AC Delco spark plug wires(they were 3 years old and #2 was not sparking) AC Delco spark plugs (3 years old and bad) fuel filter ( had got some bad gas and clogged filter black fuel and particles came out of filter) checked and cleaned small amount of debris from fuel pressure regulator BOSCH Oxygen sensor B1S1,B2S1,B2S2 water pump (went bad) AC compressor (went bad) air filter (verry old) inspected and cleaned MAF sensor with MAF sensor cleaner replaced both corner boots for vacuum line had small cracks (runs from top of engine over to valve cover by cylinder 1) checked OHMs reading for all four coil packs (reading at .005)
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bobsblue95
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Scars of pleasure, scars of pain. Atmospheric changes make you sensitive again.
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Post by bobsblue95 on Jul 30, 2014 12:46:28 GMT -6
clogged cat?
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Randy T.
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☯ AURORA GXP ☯
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Post by Randy T. on Jul 31, 2014 6:09:26 GMT -6
Is this a '97 Aurora?
You may want to check your backfire valve in your intake, they are known to leak and cause problems, the valve itself is changeable, so you don't have to change the intake, it is behind the power steering pump, you can see it with a flashlight. You may also have a bad coil pack, you can compare the ohms of the 4 coil packs by checking between the posts of each individual coil pack, sometimes that shows the culprit.
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Randy T.
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☯ AURORA GXP ☯
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Post by Randy T. on Jul 31, 2014 6:25:15 GMT -6
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Post by digdaddy on Jul 31, 2014 9:32:04 GMT -6
It's a 1996, reading for all Coil packs at .005 ohm's. Never heard of a antibackfire valve thanks for the suggestion gonna look into it.
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Post by sall on Jul 31, 2014 11:16:53 GMT -6
Yes, that valve makes for a large vacuum leak. Spray around the intake manifold carrier gaskets as well. Have you tested fuel pressure?
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Post by digdaddy on Jul 31, 2014 18:57:18 GMT -6
It sounds like the leak is coming from the antibackfire valve, thank you for the link I have the same movement as shown in video. Was thinking of doing a fuel pressure test but would have to buy a gauge first. Hopefully the seal is the culprit of the problem and fuel pressure test is not needed. Sprayed throttle body cleaner around the whole intake manifold and the antibackfire valve with no change.
Thank you
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Randy T.
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☯ AURORA GXP ☯
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Post by Randy T. on Aug 1, 2014 5:57:45 GMT -6
Most parts stores have rental tools, leave a deposit and you can borrow them. Harbor Freight pressure testers are cheap and work pretty decent. Fuel Injection Pump Tester
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