Transmission Probs

alblogg · #1 10-07-2006, 10:25 AM

Well I found my noise fixed that tuned her up runs great now I have a new prob. When you pull out and kick down it will not change out of 1st gear into 2nd until you let up off the gas and the RPMs drop back down to about 6 or 700. '01 4sp V-6 3.1

MT-2500 · #2 10-07-2006, 10:36 AM

Quote:

Originally Posted by alblogg

Well I found my noise fixed that tuned her up runs great now I have a new prob. When you pull out and kick down it will not change out of 1st gear into 2nd until you let up off the gas and the RPMs drop back down to about 6 or 700. '01 4sp V-6 3.1

What one is it.
Make model and trans?
Mileage and service history?
What noise did you fix?
How is the fluid and fluid level?
Any check engine lights?
Is the i-2 shift the only one that is not working right?
MT

alblogg · #3 10-07-2006, 11:33 AM

'01 Maibu LS
3.1 V6
4 sp auto
127K
Noise was unrelated PS pump, tran fluid full,changed 15K ago,No check engine, I have had this car 1 year it was a thief recovery car I bought at auction with front end damage I fixed the shop adopted it for a parts getter I change oil regularly just tuned it up. Other than that not needed nothing.

tractorboy · #4 10-07-2006, 08:43 PM

You have the 4T40E trans probably. Ummm I would check the fluid level. I know you just had it changed. I would just check it anyway. You have to check it like a differential or transfer case / manual transmission. It more than like ly is @ the correct level, though I would check. Did it always do this or did it just start or you never noticed. Umm the trans is pretty much controlled by the PCM , the OS in the PCM has cells that go from one rpm to another . The cells dictate when the trans will shift, you have rpm and mph, both have to be met for the trans to shift or downshift. Are you going WOT when it will not upshift ?

alblogg · #5 10-07-2006, 11:51 PM

I have checked the fluid level it is full. I was thinking about the 1st 2nd shift sensor being bad. I don't know. Answer to your question as long as you hold gas down it will not shift out of 1st you have to let all the way off of gas and let RPM drop all the way down before it will shift and this just started two weeks ago.

slls · #6 10-08-2006, 05:53 AM

Put it on a transmission capable scanner and see what codes and scann for operation.

tractorboy · #7 10-08-2006, 08:26 AM

is just at WOT ( wide open throttle ) that it will not shift from 1st to second ?
because at WOT on my Impala 1st to 2nd does not happen to close to 40 mph. Does the engine run smootly, it is not misfiring or anything ? Does the trans shift from 2nd to 3rd in WOT ? If you put the gear selector in 1st gear and do a WOT and manually move it to 2nd, will it upshift. There is a lot it can be, odd that you are not getting a MIL ( CEL) .
It could be a shift solenoid , pressure valve , torque converter , I am thinking more like the PCM. The PCM is at front of the car , wasn't the car in a front end accident. ? Like I said earlier it could be something else like the MAF being dirty, or the MAP not regestering the correct vacuum ? I do not know if GM uses those in it's calcs for the transmission. You may have met your match and it may be time for the dealer and a scanner.

alblogg · #8 10-08-2006, 09:55 AM

Quote:

Originally Posted by tractorboy

is just at WOT ( wide open throttle ) that it will not shift from 1st to second ?
because at WOT on my Impala 1st to 2nd does not happen to close to 40 mph. Does the engine run smootly, it is not misfiring or anything ? Does the trans shift from 2nd to 3rd in WOT ? If you put the gear selector in 1st gear and do a WOT and manually move it to 2nd, will it upshift. There is a lot it can be, odd that you are not getting a MIL ( CEL) .
It could be a shift solenoid , pressure valve , torque converter , I am thinking more like the PCM. The PCM is at front of the car , wasn't the car in a front end accident. ? Like I said earlier it could be something else like the MAF being dirty, or the MAP not regestering the correct vacuum ? I do not know if GM uses those in it's calcs for the transmission. You may have met your match and it may be time for the dealer and a scanner.

I know a friend of mind that been doing trans as long as I been doing body work so I think I am going to take it to him one day this week let him hook it up and see what he finds out. Whole lot cheaper to let him find the one prob than me trying this and this.

tractorboy · #9 10-08-2006, 12:12 PM

sounds like a plan

alblogg · #10 10-26-2006, 03:53 PM

Well here is the update on my transmission problems of not shifting out of 1st into 2nd without letting completely off of the gas (never saw this coming). Took it to my buddy at the trans shop he checks it out puts it on his scanner finds nothing, takes it to the Chevy place they put it on their scanner plugged CAT converter. I would never have thought that a plugged exhaust would keep my trans from shifting.

MT-2500 · #11 10-26-2006, 04:02 PM

Quote:

Originally Posted by alblogg

Well here is the update on my transmission problems of not shifting out of 1st into 2nd without letting completely off of the gas (never saw this coming). Took it to my buddy at the trans shop he checks it out puts it on his scanner finds nothing, takes it to the Chevy place they put it on their scanner plugged CAT converter. I would never have thought that a plugged exhaust would keep my trans from shifting.

Thanks for posting back with the fix.
Glad you got it going good.
Yes the engine has to be running good for the transmission to work good.
Cats carry a 80k 8 year standard mmisions warranty and some have been extended more.
MT

alblogg · #12 10-26-2006, 04:07 PM

Quote:

Originally Posted by MT-2500

Thanks for posting back with the fix.
Glad you got it going good.
Yes the engine has to be running good for the transmission to work good.
Cats carry a 80k 8 year standard mmisions warranty and some have been extended more.
MT

Well I am over the warranty but I am glad to find out what was wrong and soooo happy I don't have to get any thing done to the tranny.

dgallo_2000 · #13 03-28-2007, 11:20 AM

Do you have to drop the trans to replace these sensors? My 2000 Malibu 3.1 will not shift out of 2nd. It shifts from 1-2 just fine, but not 2-3. I have been dealing/driving this for a while now, thinking I need a new trans, but fter reading this, I was hoping just a sensor. I had it checked before, and my mechanic says, the computer shows it shifting, but it is not physically shifting!

Thanks...

MT-2500 · #14 03-28-2007, 11:38 AM

Quote:

Originally Posted by dgallo_2000

Do you have to drop the trans to replace these sensors? My 2000 Malibu 3.1 will not shift out of 2nd. It shifts from 1-2 just fine, but not 2-3. I have been dealing/driving this for a while now, thinking I need a new trans, but fter reading this, I was hoping just a sensor. I had it checked before, and my mechanic says, the computer shows it shifting, but it is not physically shifting!

Thanks...

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