loping idle lean fuel mix on left bank & right bank?

2001 CADILLAC DEVILLE
75,000 MILES • V8 • FWD • AUTOMATIC
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FRANK HERDMAN
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trouble code lean fuel mix on left bank & right bank. have replaced iac valve & tp sensor. also has a loping idle. replaced all 3 oxygen sensors, pcv valve & spark plugs. still have loping idle. idle rpms are 575-650. vacuum psi 19 steady.
Dec 12, 2007 at 7:38 PM
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BLACKOP555
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the lean bank code usually means a bad O2 sensor, replace and your problem shoudl go away.

can you provide with the codes?
Dec 12, 2007 at 8:23 PM
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STRAILER
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I don't think so, it sounds like the fuel pump is going out or the fuel filter needs to be replaced, here is the location of the fuel filter and a guide to help you understand what the problem is.

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

Fuel pressure should be

Key On Engine Off 41-47 psi

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Check out the images (below). Let us know how it goes.

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Aug 27, 2024 at 2:01 PM
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