Bumpy Hesitant acceleration w/ check engine light on and mystery poof noise..

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Old 24 Jan 2013, 10:56 pm   #1 (permalink)
hzohdy708@gmail.com
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Default Bumpy Hesitant acceleration w/ check engine light on and mystery poof noise..

Hello Everyone.

I have a 1998 Lexus GS 300 w/ 191,000.

I don't know how to exactly describe the problem but here goes.

Check engine light is one w/ p1071 code - too lean condition.

The car idles fine. No stalling. No issues.

The car revs fine w/o issue in park.

When I accelerate, I can accelerate normally as long as I go SLOW.

If I give a lot of gas the car revs for a few seconds, you can hear a POOF sound come from the engine and then it eventually accelerates fast like it's supposed to.

I just changed out spark plugs and changed Valve cover gaskets but this problem existed before that. When I change the spark plugs out, I found them drowned in motor oil. When looking into the holes from where the spark plugs go, a lot of "crud" can be seen.

Anyone have a suggestion or can explain the POOF Sound ??

Much appreciated !
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Old 25 Jan 2013, 01:40 pm   #2 (permalink)
hzohdy708@gmail.com
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Default Re: Bumpy Hesitant acceleration w/ check engine light on and mysterypoof noise..

I also did replace the MAF sensor but issue still exists...
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Old 01 Feb 2013, 06:52 am   #3 (permalink)
Zotto
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Default Re: Bumpy Hesitant acceleration w/ check engine light on and mystery poof noise..

May be there is some air passing trought aspiration circuit, with a hole
opening under pressure.

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