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Old 09-26-2009, 07:03   #1 (permalink)
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97 GM running lean

My 97 GM is running very lean, it bogs badly when I stand on it. If I ease into it, it's some what better. I didn't get any codes until the other day. My mechanic told me the code said and it's in his words one of the banks is running lean. NO kidding huh? It's a low miler 42k, and as result a keeper. I changed the fuel filter, but other then that, I have no idea whats up? Oh also the mechanic cleared the code and it hasn't come on since. It's been a couple of weeks. It also has a hesitation. I had a 94 and compared to it this car really sucks performance wise. Any idea's? I should also mention I put a new air filter in it.
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Old 09-26-2009, 07:42   #2 (permalink)
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Re: 97 GM running lean

Try cleaning the throttle body, MAF and ICS. There's a special cleaner for the MAF. It's possible you have a vacuum leak too, but start by cleanlng them.
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Old 09-26-2009, 08:21   #3 (permalink)
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Re: 97 GM running lean

I guess I should have mentioned I did that first. I took it to Ford and they said without codes they wouldn't touch it They did suggest the cleaning which I did and ran some carb cleaner in the gas. The mechanic said he could feel the hestation, but with out codes it would be expensive..lol. I'm wondering if there's a program that can check the tolerances on the various sensors, my mechanic suggested that one or more of the sensors may be out of spec, but not showing a code.
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Old 09-26-2009, 08:53   #4 (permalink)
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Re: 97 GM running lean

Did they tell you which sensors to spec out? Do you have a Haynes or Chilton manual?
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Old 09-26-2009, 12:30   #5 (permalink)
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Re: 97 GM running lean

Naaa, it was purely speculation. But I did a search for some free software, which I did find. Just have to buy a cable to run from my laptop.
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Old 10-26-2009, 18:31   #6 (permalink)
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Re: 97 GM running lean

well apparently I didn't listen well enough, I cleaned the mas and wow, runs like a dream. All my problems are gone.
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Old 10-26-2009, 19:06   #7 (permalink)
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Re: 97 GM running lean

Glad you got it fixed. Thanks for letting us know.
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