2000 Chevy Prism/Corolla 0171 Lean Code - The HuntingPA.com Outdoor Community
 
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post #1 of 7 (permalink) Old 07-31-2012, 07:55 PM Thread Starter
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2000 Chevy Prism/Corolla 0171 Lean Code

Hey guys. The engines in these cars seams to give people fits with the 0171 Lean Code. I have changed the MAF sensor and keep it sprayed, changed out the Bank 1 Oxygen Sensor, changed out the PCV Valve and sprayed all thru the vaccum lines and intake butterfly. In helps for a while and then comes right back to the 0171 code within a day-1 week.

When you start it, it is hard starting and then when it does start the idle stays high for longer than usual. The engine shakes and then catched and then the high idle, sometimes it stalls the first time. Some times the gas peddle has a delay and seams too lose power. The gas mileage has gone down. It`s not as bad at high speed. I am thinking the problem is sending the engine into default model and the oxygen sensor can`t do it`s job properly.

It is on it`s second set of plugs, but that was before the new oxygen sensor or new MAF sensor. Maybe new plugs again? They are expensive and really hard to change in this car as they are Irridum and buried under a coil-dumb design.

I`d kinda like to solve this as we are selling it.

Any help would much appreciated!! Thanks.

Jack

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post #2 of 7 (permalink) Old 07-31-2012, 08:05 PM
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Re: 2000 Chevy Prism/Corolla 0171 Lean Code

I dont know but changing plugs again, unless you've gotten some miles (my some I mean like, fifty thousand), sounds like treating the symptom not the problem.

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post #3 of 7 (permalink) Old 07-31-2012, 08:10 PM
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Re: 2000 Chevy Prism/Corolla 0171 Lean Code

One thing that's happened to me is when the O2 sensors go bad and the engine runs lean too long is that it can actually melt the honeycombs in the Cat converters and cause it to run rough and lose power.

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post #4 of 7 (permalink) Old 07-31-2012, 11:32 PM
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Re: 2000 Chevy Prism/Corolla 0171 Lean Code

These engines are a pain for the common man(and many mechanics) to work on. I have an '08 Nissan with 57K and the light keeps coming on for emissions system leak. I usually trade way before four years old. But, I really like the truck and it is paid off.
I tell kids to become mechanics. Mechanics are in high demand and it will only get better with how complicated the engines are, especially diesels.

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post #5 of 7 (permalink) Old 08-01-2012, 12:50 AM
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Re: 2000 Chevy Prism/Corolla 0171 Lean Code

I'll fess up to being a Toyota tech. From what you're describing I'd bet bottom dollar that the intake manifold gasket is leaking. Plastic intake manifolds are noted for this and cause the problems mentioned. A slow responding rear O2 sensor can cause the lean condition but the high idle/stalling indicates a vacuum leak. BTW...pretty easy & inexpensive repair to replace the intake manifold gasket.
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post #6 of 7 (permalink) Old 08-01-2012, 08:25 PM Thread Starter
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Re: 2000 Chevy Prism/Corolla 0171 Lean Code

Thanks fellas!! I have heard about the intake gasket going bad as well.

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post #7 of 7 (permalink) Old 08-01-2012, 11:45 PM
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Re: 2000 Chevy Prism/Corolla 0171 Lean Code

If it was colder I would guess plugs but since you say they are somewhat new I don't know. If its a Chevy I would bet the farm a bad gasket. Chevy went way cheap with them for awhile. That's what happened with my s10. Cheap gaskets.

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