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Dying at start, rough idle, erratic tach, I'm at a loss

 
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macleod348
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PostPosted: Wed Jan 18, 2012 10:05 pm    Post subject:  Dying at start, rough idle, erratic tach, I'm at a loss Reply with quote

Well, the A/C hasn't been coming on of it's own volition again so maybe that was just a freak thing. I cleaned the MAF sensor and the P0171 code has gone away.


Buuuuut the P0455 is back. Now the car feels like it is choking at start up, sometimes it will stall, sometimes not. If I give it some gas it will settle in between 600 and 1200, depending on if the motor is warm or cold. I noticed while backing out of the driveway today that it would jump up without me touching the gas causing a jerky acceleration. This is especially troublesome since I am not touching the gas pedal at the time, and we live across the street from a school so I don't want it to jump accidentally and I hit a kid, or some parent's car. Tonight I noticed while driving that the tach is jumping around somewhat erratically while driving. At stops it is jumping to around 12-1300 and then settling down to 650ish. If I am driving and let off the gas while rolling it does the same. Once while waiting in the center lane to merge it dropped down to the 650 range and started shuddering violently. I am at my wits end with this car, it somehow knows when I will be getting an overtime check and starts crapping out on me.

Clear as mud? If I can do a better job describing anything please let me know.

Forgot to mention, this is an 05 LS 3800 V6
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IffyG
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PostPosted: Wed Jan 18, 2012 10:42 pm    Post subject:   Reply with quote

Have you checked the idle air control valve? Sounds like it might be sticking.

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macleod348
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PostPosted: Wed Jan 18, 2012 10:57 pm    Post subject:   Reply with quote

Any help on where that would be? My Haynes manual seems to have gone missing at the moment as well. I'm close to setting the car on fire.
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IffyG
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PostPosted: Wed Jan 18, 2012 11:02 pm    Post subject:   Reply with quote

It's on the throttle body. There are three connectors 1) the MAF, 2) the TPS and 3) the IAC. The MAF is on top and the other two are on the front but I don't remember which one is which off the top of my head. It's pretty easy to take off and check if you have the right security torx bits.

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billy101
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PostPosted: Wed Jan 18, 2012 11:15 pm    Post subject:   Reply with quote

Could also be a vacuum leak possibly?

This picture can help you identify the IAC Valve.


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2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
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macleod348
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PostPosted: Wed Jan 18, 2012 11:31 pm    Post subject:   Reply with quote

Thanks for the photo! Found my Haynes manual, how it got under the couch will probably never be known. I may try to mess with the IAC at the firehouse tomorrow. Next step would be figuring out how to check for a vacuum leak. Fortunately I have a guy there who is pretty much a savant in these matters.
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billy101
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PostPosted: Wed Jan 18, 2012 11:39 pm    Post subject:   Reply with quote

macleod348 wrote:
Thanks for the photo! Found my Haynes manual, how it got under the couch will probably never be known. I may try to mess with the IAC at the firehouse tomorrow. Next step would be figuring out how to check for a vacuum leak. Fortunately I have a guy there who is pretty much a savant in these matters.


Check to make sure that hose coming off the throttle body right to the left of the TPS isn't cracked or broken. I know they like to dry rot and break. Had it happen to mine twice.

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2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
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macleod348
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PostPosted: Wed Jan 18, 2012 11:46 pm    Post subject:   Reply with quote

Will do, I know I have had that apart when I replaced the t-stat last year.

Also, the last time I accessed the throttle body I noticed the "mesh" on the non engine side had some gouges in it. Is that a replaceable part?
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billy101
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PostPosted: Thu Jan 19, 2012 12:16 am    Post subject:   Reply with quote

macleod348 wrote:
Will do, I know I have had that apart when I replaced the t-stat last year.

Also, the last time I accessed the throttle body I noticed the "mesh" on the non engine side had some gouges in it. Is that a replaceable part?


To be honest. I removed mine because the fins were all messed up, I haven't had any adverse effects

_________________
2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
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IffyG
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PostPosted: Thu Jan 19, 2012 12:19 am    Post subject:   Reply with quote

That's the last line of defense for stuff that get into the air intake system plus it 'even out' the air flow before it hits the MAF. I wouldn't remove it and would probably replace it if I knew it wasn't in there.

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billy101
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PostPosted: Thu Jan 19, 2012 12:45 am    Post subject:   Reply with quote

IffyG wrote:
That's the last line of defense for stuff that get into the air intake system plus it 'even out' the air flow before it hits the MAF. I wouldn't remove it and would probably replace it if I knew it wasn't in there.


Hmm, okay. What if I don't know where the retaining clip is for it? Would it be OK if I just placed it back in there?

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2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
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2001Ls
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PostPosted: Thu Jan 19, 2012 1:00 am    Post subject:   Reply with quote

My car was rumbling like a tank. Replaced the cat.
Check out my thread....
http://www.naioa.com/v2/module.....mp;t=45970
I'll respond if you think you're problem might be the same and I can help.



Also I was just thinking, any thoughts on it being a bad fuel pump, how old is the fuel pump and when you have been driving for about 30 mins and stop to get gas or something then turn the car back on in a matter of minutes does it choke and have a hard time starting. Im just thinking... if it was a bad fuel pump you'd prob have a hot restart problem.

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macleod348
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PostPosted: Thu Jan 19, 2012 8:45 am    Post subject:   Reply with quote

Yep, I read through your thread prior to posting mine. I have not had any of the acceleration issues that you are experiencing. When I put the pedal down my car accelerates without issue.

As for the fuel pump, it is original equipment.

I tried soemthing I read somewhere on the interweb last night when I left for work this morning. Someone had suggested placing the key in the "on" position for approx 15 seconds prior to trying to start as a check for the IAC. I did this and did not experience any issues. Anybody know if that is an accurate check of the IAC or not?
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