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Trans problem- Update 6-7-2012... finally have the car back
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IffyG
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PostPosted: Sun May 01, 2011 4:10 pm    Post subject:  Trans problem- Update 6-7-2012... finally have the car back Reply with quote

Over the last few weeks I've been having issues with intermittent long shifts from 3 to 4 and difficult 4-3 downshifts on the highway. Yesterday I was merging onto the highway and the it banged through the 3-4 shift.

Today I swapped out my poly motor mounts and brackets with a pair of brackets and rubber bushings I picked up from the junkyard thinking that my mounts might be amplifying the issue. I took it out on the highway and was carefully monitoring the 3-4 shift and the 4-3 shift on both the tach and my Aeroforce. The 3-4 shift seems to go smoothly most of the time aside from the occasional long shift and the bang into 4th I experienced yesterday.

The 4-3 downshift on the other hand seems to be royally screwed. Once the car is cruising in fourth gear (per my Aeroforce), I accelerated to induce a downshift. The RPMs would initially jump with minimal acceleration, the transmission downshifts and the RPMs drop approximately 300-400 before 3rd gear finally catches and the car continues accelerating.

I've been through a few transmission scares, so I have checked everything that caused bad shifts in the past (my trans fluid is full, battery is good, cat is good, MAF is good) and can't come up with anything else easy to check before I haul it to a shop for a diagnostic. Any input would be appreciated.

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Last edited by IffyG on Thu Jun 07, 2012 9:16 pm; edited 7 times in total
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amoffitt
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PostPosted: Sun May 01, 2011 4:23 pm    Post subject:   Reply with quote

I had some problems with the shifts of the transmission last December. I did a transmission flush and filter change and had no problems with it since... Not a transfusion or anything like that, i dropped the pan, drained it out and switched filters and went on my way without issues

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IffyG
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PostPosted: Sun May 01, 2011 4:28 pm    Post subject:   Reply with quote

I should have mentioned I did a pan drop and filter change in August of 2009 and have only put 12k miles on the car since then.

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amoffitt
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PostPosted: Sun May 01, 2011 5:13 pm    Post subject:   Reply with quote

IffyG wrote:
I should have mentioned I did a pan drop and filter change in August of 2009 and have only put 12k miles on the car since then.


Hmm idk then. i have one of those Certa transmission in my car and havent had a problem with it after the fluid and filter change. But if i do the impala is gonna be replaced

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ad0726
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PostPosted: Sun May 01, 2011 8:28 pm    Post subject:   Reply with quote

Maybe a bad transmission solenoid.
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Baywing
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PostPosted: Mon May 02, 2011 9:24 am    Post subject:   Reply with quote

Check the MAP sensor (on top of the PCV). Mine had a defect in the orange, accordian gasket that looked like it was partially blocking the opening (meaning it may not have been getting a timely accurate reading). Tranny did seem to smooth out abit after MAP sensor replacement. Part wasn't too bad, $46 at the dealer IIRC. Got the lead from the TEP website, he lists other things that can cause tranny related issues.
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IffyG
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PostPosted: Mon May 02, 2011 10:48 am    Post subject:   Reply with quote

I know the MAF sensor can cause transmission like symptoms, but this is the first I'm hearing of MAP sensor issues manifesting as transmission problems. I took a look at TEP and he doesn't mention anything about MAP sensors that i can find, only the MAF sensor.

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PostPosted: Mon May 02, 2011 11:56 am    Post subject:   Reply with quote

Sorry, I might have gotten the two confused, re: the TEP site. I do know that my MAP sensor had a flaw and if you think about it, manifold pressure is one of the feedbacks that the computer uses to control the engine/tranny.
Might not mean anything, but it seemed to help mine.
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Bill58
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PostPosted: Mon May 02, 2011 12:27 pm    Post subject:   Reply with quote

ATF smell burned or look "metal flake"?
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IffyG
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PostPosted: Mon May 02, 2011 12:30 pm    Post subject:   Reply with quote

Nope. What I got out of the dipstick looks and smells practically brand new (which is expected since it only has 12k miles on it).

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Bill58
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PostPosted: Mon May 02, 2011 12:39 pm    Post subject:   Reply with quote

Sea Foam Trans Tune....I have never tried it but you might look at their site.
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IffyG
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PostPosted: Mon May 02, 2011 12:47 pm    Post subject:   Reply with quote

I don't think I'm gonna be going the mechanic in a bottle method. I'm thinking I'm well on the way to losing the fourth clutch hub/shaft/whatever the hell it's called that has the crappy ass splines that strip out...

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Bill58
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PostPosted: Mon May 02, 2011 1:34 pm    Post subject:   Reply with quote

I hear you, just thinking it may help and shouldn't do any harm.
Sometimes your out of easy options.
I would expect metal flake if hard parts were being eaten.
'03 was the first year for the hardened shaft?


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PostPosted: Mon May 02, 2011 1:48 pm    Post subject:   Reply with quote

Bill58 wrote:
I hear you, just thinking it may help and shouldn't do any harm.
Sometimes your out of easy options.
'03 was the first year for the hardened shaft?


20004 I think? I believe it was 97-03 with the problems.

EDIT: I lied, you were right.

http://www.tripleedgeperforman....._Gear.html

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IffyG
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PostPosted: Mon May 02, 2011 2:10 pm    Post subject:   Reply with quote

Bill58 wrote:

I would expect metal flake if hard parts were being eaten.


Between the magnet in the trans pan and the fact that I'm only pulling a few drops off the dipstick, I'm not sure how much metal might be in what I have looked at.

Honestly, I'm mostly interested in learning if anyone else has experience the laggy shifts and RPM drops I'm experiencing.

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