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Whoa this isn't good
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barnettimpala
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PostPosted: Tue Jan 08, 2013 6:00 pm    Post subject: Snif ! Whoa this isn't good Reply with quote

Today I went WOT and noticed something really bad. First of all, car is 3400. It will normally shift into second at 45mph wot. From a stop, wot it seems normally, but a little slower, then all of a sudden at 35mph it loses acceleration almost completely. The car doesn't stop trying tho. It keeps going and very slowly gets to about 42mph and is screaming and can't even get itself to second. Something (transmission I'm assuming?) is making the car not accelerate. But it's like it has no clue and it just keeps trying. The engine doesn't bog. The transmission doesn't feel like it's slipping. There are no check engine lights. It's halfway thru a tank of gas so I'd throw bad gas out. And I did WOT on the freeway this morning and it didn't do it, so it all of a sudden started and has done it ever since, hot or cold. When I rev it in park, seems to be perfectly fine. All fluids are good. Actually transmission fluid was a bit low (on the bottom hole) but not much so that shouldn't be it at all. Sound wise, it roars way more than its supposed to, like all I hear is intake roar and when it gets to the high rpm at about 40mph i hear kind of a metal tinging sound. I can't describe that.
I need help fast because I have no idea where to go on this. I can't afford to take it to a dealer just to find out whats wrong.
Thank you in advance

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VictoryRed09
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PostPosted: Tue Jan 08, 2013 7:43 pm    Post subject:   Reply with quote

The Tinging sound might be octane knock. It can be caused by a lean condition check the fuel Filter .. might be plugging up.

Other items MAF sensor could be getting dirty giving a signal to run lean.

or gas that is under octane or has too much ethenol in it.

just a thought 3 .
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barnettimpala
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PostPosted: Tue Jan 08, 2013 7:50 pm    Post subject:   Reply with quote

Started happening half way thru a tank. And I'm not talking about just a noticeable decrease in accelerating. Something is definately wrong. No cel, not even any stored. Shouldn't a lean condition cause a light?

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Frank
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PostPosted: Tue Jan 08, 2013 7:55 pm    Post subject:   Reply with quote

Have you ever replaced the cat? I haven't experienced it, but it could potentially be a clogged cat.

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barnettimpala
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PostPosted: Tue Jan 08, 2013 8:37 pm    Post subject:   Reply with quote

That's what I was thinking but it happened all of a sudden and there's no codes so I don't know. Literally a few hours before it didn't do it

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topgun
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PostPosted: Tue Jan 08, 2013 8:57 pm    Post subject:  not good Reply with quote

I'm leaning to cat problem. remove the O2 sensor before the cat and drive it. It will be very noisy but you'll get to see if it makes a difference. Cool

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00impala123
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PostPosted: Tue Jan 08, 2013 10:53 pm    Post subject:   Reply with quote

I was going to say cat as well

just cut it off and see if it gets better Laughing

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barnettimpala
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PostPosted: Tue Jan 08, 2013 11:49 pm    Post subject:   Reply with quote

Dang that upstream O2 sensor was a pita to get out last time. So take it out and drive? That's not really much of a opening is it?

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PostPosted: Tue Jan 08, 2013 11:55 pm    Post subject:   Reply with quote

No it's not, but it's all you need to see if there is an improvement.

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Lingenfelter
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PostPosted: Wed Jan 09, 2013 12:45 pm    Post subject:   Reply with quote

Frank wrote:
Have you ever replaced the cat? I haven't experienced it, but it could potentially be a clogged cat.


I was thinking this. But it seems like I point at the catalytic converter so often I feel like a broken record Laughing

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Frank4202
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PostPosted: Wed Jan 09, 2013 1:45 pm    Post subject:   Reply with quote

Lingenfelter wrote:
Frank wrote:
Have you ever replaced the cat? I haven't experienced it, but it could potentially be a clogged cat.


I was thinking this. But it seems like I point at the catalytic converter so often I feel like a broken record Laughing


My first thought too. Odds are shes clogged. You gotta test for back pressure to confirm this.

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PostPosted: Wed Jan 09, 2013 3:21 pm    Post subject:   Reply with quote

Had similar problem on my 02LS, was fine going to work, on way home it crapped out. Ended up being the cat.

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barnettimpala
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PostPosted: Wed Jan 09, 2013 4:28 pm    Post subject:   Reply with quote

I guess all of a sudden it could break and collapse. What are my options if it ends up being bad cat. I dont want to spend a bunch of money and I don't really care about performance, but if a downpipe will be a noticeable difference and isn't expensive I may go that route

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PostPosted: Wed Jan 09, 2013 6:00 pm    Post subject:  not good Reply with quote

If it proves to be bad, cut the under side open, dig out the crap and weld back up. Cool

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PostPosted: Wed Jan 09, 2013 6:10 pm    Post subject:   Reply with quote

barnettimpala wrote:
I guess all of a sudden it could break and collapse. What are my options if it ends up being bad cat. I dont want to spend a bunch of money and I don't really care about performance, but if a downpipe will be a noticeable difference and isn't expensive I may go that route


OEM cats are expensive (600+ bucks). Your best bet is an aftermarket downpipe and a tune to get rid of the codes.

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