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 Tranny Problems??? 98Riviera!!

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Angeles98
Newbie


Name : Alex Angeles
Joined : 2019-09-12
Post Count : 1
Merit : 0

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PostSubject: Tranny Problems??? 98Riviera!!   Tranny Problems??? 98Riviera!! EmptySun Nov 17, 2019 11:06 pm

Soo I was doing some pulls with my other fellow 3.8 friends and during one pull, when my car was about to shift out of 3rd gear my Rpms stayed high for about a second before a shift. A raced my friend with a regal moments after and this time my rpms bounced for a second before they shifted. I did check my tranny fluid which seems to be a little low but not sure if that's the real problem, thanks for the help , new at this 3.8 stuff, my car also reads a P0420 code, any ideas?
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DeepFrozen
Enthusiast


Name : Dmitry
Joined : 2016-08-28
Post Count : 105
Merit : 5

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PostSubject: Re: Tranny Problems??? 98Riviera!!   Tranny Problems??? 98Riviera!! EmptyMon Nov 18, 2019 2:10 am

It could be your ATF got all bubbled up after several enthusiastic pulls.
Code P0420 is about the low efficiency of catalytic converter.
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dbriviera
Amateur
dbriviera

Name : Dave Derhak
Location : VANCOUVER ISLAND
Joined : 2014-07-08
Post Count : 26
Merit : 2

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PostSubject: Re: Tranny Problems??? 98Riviera!!   Tranny Problems??? 98Riviera!! EmptyThu Dec 05, 2019 2:43 am

Is the transmission stock and are all the shift points and pressures stock settings in the powertrain control module? .if it's all stock it's a good chance it's going to need repairs soon. There's nothing you can do really other than replace the fluid and filter for maintenance. If the trans if flaring between shifts it could be a worn clutches. If it's an all of the sudden occurrence it could be debris floating around in the transmission ( think metal filings usually) . These are cars built for comfort not high performance so each shift is timed generally at .750 sec for smooth comfort but it's not meant for a performance shift. This 4t65E is basically a heavy duty electronic version of a 4t60E in a car that could have used a more robust 4t80E transaxle . Anyhow, because the shifts are timed as such the line pressure is increased, as throttle position, torque and road speed are increased simultaneously and shift points are moved to higher rpm as well..its all on tables written within the programming of the PCM ....So run hard and shifts ate commanded quicker and with more line pressure. So if you have a clutch issue in a pack or sh!t caught in the fluid flow...it may cause a flair during a shift generally speaking.(see diagnostic pages below) ...I have altered all my transmission shift points, line pressures, shift speeds (.250 sec) as well as torque converter operation and removed all speed governors using HP Tuners software. I altered it 5 times until I had it set just right. It was a learning experience. My trans shifts crisp and clean, releases the TCC under less throttle, downshifts quicker and holds third gear up to 43 mph under normal throttle ..this makes the car feel allot less sluggish and accelerating quicker under light to moderate throttle also it will shift to 4th gear at 125 mph under full throttle . Only brave enough to try it twice!


Last edited by dbriviera on Thu Dec 05, 2019 3:34 am; edited 1 time in total
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dbriviera
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dbriviera

Name : Dave Derhak
Location : VANCOUVER ISLAND
Joined : 2014-07-08
Post Count : 26
Merit : 2

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PostSubject: Re: Tranny Problems??? 98Riviera!!   Tranny Problems??? 98Riviera!! EmptyThu Dec 05, 2019 3:03 am

Keep in mind that the shifts are all timed and controlled via solenoid pack in the side case. Here are some diagnostic charts and diagrams to help out ...Tranny Problems??? 98Riviera!! 20191214
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dbriviera
Amateur
dbriviera

Name : Dave Derhak
Location : VANCOUVER ISLAND
Joined : 2014-07-08
Post Count : 26
Merit : 2

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PostSubject: Re: Tranny Problems??? 98Riviera!!   Tranny Problems??? 98Riviera!! EmptyThu Dec 05, 2019 3:15 am

Troubleshooting Tranny Problems??? 98Riviera!! New_do12
Tranny Problems??? 98Riviera!! New_do13
Tranny Problems??? 98Riviera!! New_do14
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