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Harsh shifts between 3rd&4th gear?
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PostPosted: Tue Aug 16, 2011 8:00 am    Post subject:  Harsh shifts between 3rd&4th gear? Reply with quote

Hello all... I know there are many tranny related threads, but I figured I'd add my issue into the mix here...

I have noticed, over the past few days, what feels like a quick hesitation at highway speeds... What it seems to be is, for example, cruising at 65MPH with tranny in 4th gear (overdrive?)... Then I let off the throttle to slow a little and then re-apply some gas... It seems like the shift between 4th & 3rd (or maybe 3rd to 4th?) is laggy or clunky... Feels exactly like a hesitation... Lower gears at lower speeds feel perfect...

About 3 years ago I had a problem with laggy or clunky shifting in the lower gears... I poured a can of Sea Foam Trans-Tune in the tranny, drove for a week and then had the pan dropped and changed out the filter and fluid... Replaced the fluid with Dexron VI... Since then, every few months, I suck out 1 quart of tranny fluid from the dip stick tube and replace with a new quart of Dexron VI... Tranny has been shifting perfectly over these past 3 years...

But now I feel this laggy shift, or hesitation, between 3rd and 4th at highway speeds... Comments? Suggestions? (2001 Impala LS w/101,000 miles)

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Arvetus
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PostPosted: Tue Aug 16, 2011 9:07 am    Post subject:   Reply with quote

well, which is it? laggy or harsh? Subject says one thing, post says another.

The pressure control solenoid is a common part to need replaced on the trans., but usually what happens is that is bangs into the next gear.

One of my first transmissions on the car when I owned it experienced some very long shifts and wound up having a chewed up sun gear, amongst other things...

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PostPosted: Tue Aug 16, 2011 9:19 am    Post subject:   Reply with quote

Arvetus wrote:
well, which is it? laggy or harsh? Subject says one thing, post says another.

The pressure control solenoid is a common part to need replaced on the trans., but usually what happens is that is bangs into the next gear.

One of my first transmissions on the car when I owned it experienced some very long shifts and wound up having a chewed up sun gear, amongst other things...


Yeah, you're right... I said 2 contradicting things...

Laggy would mean a delayed shift, as in RPM's increase above a normal range before the shift occurs?

Harsh would mean banging into gear?

Of those two, what I feel is a "harsh" shift... I feel like a quick hesitation, or quick shudder, and then it finds the gear... The RPM range during the shift seems normal...

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PostPosted: Tue Aug 16, 2011 11:38 am    Post subject:   Reply with quote

How frequently is it doing it? Do you have a way to scan for codes (you might find a p1811)? Have you checked your fluid for metal shavings?

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PostPosted: Tue Aug 16, 2011 1:28 pm    Post subject:   Reply with quote

IffyG wrote:
How frequently is it doing it? Do you have a way to scan for codes (you might find a p1811)? Have you checked your fluid for metal shavings?


It is intermittent... This morning on my 15 mile drive to work (mostly highway) it did it once... Last evening on my drive home it did it twice...

I did scan for codes last night, after my drive home... No codes... Scanned again this morning after driving into work... No codes...

Fluid is clean as a whistle, as best I can see...

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PostPosted: Tue Aug 16, 2011 6:11 pm    Post subject:   Reply with quote

I dont know the answer to your question but i also have some transmission issues, Not to steal your thread but i think people would be happier if i posted here than make another post right above it.

Mine sometimes after driving for about and hour sometimes when i come to a stop and try to take off it seems like the car is in a higher gear and takes off very slow, Sending alot of vibrations and banging through the car, Then if i turn the car off for about 2 minute then start it up its perfect.? Anyone else have any problem like this?
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PostPosted: Wed Aug 17, 2011 9:33 am    Post subject:   Reply with quote

Just a quick update from me... Tranny shifted perfectly during the drive home last night and during the drive into work this AM... So this seems to be an intermittent problem... Confused

EDIT: Harsh shifts happening more often now between 3rd & 4th gears. Leaving the car at my mechanic tonight with fingers crossed.

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PostPosted: Mon Aug 22, 2011 8:45 am    Post subject:   Reply with quote

Probably need the pressure control solenoid or solenoids changed. Is there only 1 PCS or several in this tranny? Also suspect is the TCC/PWM solenoid but I'm told you need a GM Tech 2 machine to read the codes. I found this pic which shows several solenoids.

http://i5.photobucket.com/albu.....ebody2.jpg

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PostPosted: Mon Aug 22, 2011 10:56 am    Post subject:   Reply with quote

There is only 1 PCS... 4 solenoids total

2 Shift, 1 Pressure Control, 1 Torque Converter

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PostPosted: Mon Aug 22, 2011 11:14 am    Post subject:   Reply with quote

bbengineer wrote:
There is only 1 PCS... 4 solenoids total

2 Shift, 1 Pressure Control, 1 Torque Converter

BBEngineer


The PCS seems to be the most likely issue. But doesn't it make sense to change them all once you've already invested all the labor time to gain access to them?

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PostPosted: Mon Aug 22, 2011 4:55 pm    Post subject:   Reply with quote

Yeah, the PCS will cause a very harsh and abrupt shift from 3-4, and sometimes other gears as well. It seems to happen quite a bit with these transmissions

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PostPosted: Wed Aug 31, 2011 1:59 pm    Post subject:   Reply with quote

Arvetus wrote:
Yeah, the PCS will cause a very harsh and abrupt shift from 3-4, and sometimes other gears as well. It seems to happen quite a bit with these transmissions


The transmission specialist I have the car with just called me. He says that, although the transmission does show some signs of wear, he doesn't think what I am feeling is a tranny issue and he is not reading any tranny related codes. He hooked the car up to his fancy $10,000 code reader and is reading codes about the MAF and fuel pump relay. Could either of these cause me to feel a "hesitation" or what I've been calling a harsh shifting feeling??

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PostPosted: Wed Aug 31, 2011 2:02 pm    Post subject:   Reply with quote

A bad MAF can absolutely feel like a transmission problem.

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PostPosted: Wed Aug 31, 2011 2:09 pm    Post subject:   Reply with quote

IffyG wrote:
A bad MAF can absolutely feel like a transmission problem.


This. Go buy some CRC MAF Cleaner and spray down the MAF sensor. I was getting some harsh shifts intermittently and watching the MAF sensor readings while keeping the RPM's constant it was all over the place. Cleaned it up, now reads correct and the shifts are on point every time. Good thing to check before going straight to a transmission problem.

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PostPosted: Wed Aug 31, 2011 2:25 pm    Post subject:   Reply with quote

IffyG wrote:
A bad MAF can absolutely feel like a transmission problem.


Interesting...

I have cleaned the MAF with the CRC MAF spray cleaner in the past... It's probably been a year since I did it last and it's probably the original MAF sensor... But I already gave the mechanic the OK for a new MAF and fuel pump relay since those are the code history readings he is seeing... So I'll take the dollar "hit" for these replacement parts if it fixes the problem... Still ALOT cheaper than a tranny rebuild...

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