97 lesabre lean on bank one help!! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-15-2014, 02:48 PM   #1
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Default 97 lesabre lean on bank one help!!

I had my uim crack and hydro lock my engine at 100000 miles, changed all the gaskets, fixed that. Now I'm at 114000 and constantly have have a check engine light for lean bank one. Any ideas. I've already changed out the MAF sensor
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Old 02-15-2014, 03:47 PM   #2
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did you change the lower too, alot of times lean codes are vacuum leaks. check fuel pressure?
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Old 02-15-2014, 03:51 PM   #3
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did you change the lower too, alot of times lean codes are vacuum leaks. check fuel pressure?
I replaced the upper and lower. And the fuel pressure is good.
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Old 02-15-2014, 04:01 PM   #4
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mostly just leaves vacuum leak
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Old 02-15-2014, 06:07 PM   #5
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That'* what I'm afraid of, I was getting a code for a vacuum leak, and it took me forever to figure that one out, now I just get the lean bank one code. I'm going to try and change the injectors out
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Old 02-15-2014, 07:43 PM   #6
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Check your EGR flex pipe. They are know to crack and leak, causing a nasty code such as yours.
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Old 02-15-2014, 09:07 PM   #7
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the injectors are almost never a problem. and when they are you get misfire codes. thats why i said vacuum leak, there are tons of spots prone to leaks
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Old 02-19-2014, 09:41 PM   #8
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I am having the same problem with my 99 Park Ave. I replaced the fuel injectors and nothing changed. Save your money, keep looking for the vacuum leak. I have been doing some research on introducing smoke into the intake manifold and watching for it to escape thru the leak. if I am able to find the leak I will post it hear.
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Old 03-20-2014, 10:24 PM   #9
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Mike, have you had any luck finding your leak? I found that the bolts had backed out on the UIM I installed 3 or 4 years ago. Some of them were only finger tight. I removed the fuel rail and re-torqued the bolts and the problem went away.
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Old 03-21-2014, 02:29 PM   #10
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Code can be misleading, to some......makes you think the odd numbered side has the leak.....but since this only has one O2 sensor for fuel mixture, it'* related to the whole engine.....

As the guys have said, yes a vac leak can cause a lean condition, but that is only one of many.....

Problem could be the O2 sensor signal(harness grounded) or a bad sensor, itself....

Fuel.....low fuel pressure or bad injector....contaminated fuel...

An exhaust leak, especially at the "doughnut"....

You say you changed out the MAF...just recently(if yes, new?)? If you have a scan tool and can observe pre O2 data, see if the lean condition is gone with the MAF disconnected.....

When you took apart the upper plenum, did you remove/replace the PCV valve? Have you checked to see if the black and orange o-rings are in place?
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