'92 with Shudder
Thread Starter
Team Owner
Joined: Mar 2012
Posts: 27,118
Likes: 135
From: Montgomery, Alabama
2017 C6 of Year Finalist
'92 with Shudder
My '92 automatic drives and accelerates up through the gears fine however when I punch it to pass it will shudder. It does it typically when it is cruising in overdrive at 55mph or so.
The only code showing is 32 (EGR Valve).
The only code showing is 32 (EGR Valve).
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
Check the Fuel Pressure...
Tape a Fuel Pressure gauge to the windshield and go for a drive. Then, punch it to see if the fuel pressure decreases. If it does, your fuel pump might need replacing.
Tape a Fuel Pressure gauge to the windshield and go for a drive. Then, punch it to see if the fuel pressure decreases. If it does, your fuel pump might need replacing.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
This sounds like something in the transmission. I agree, check fuel pressure, but I just feels like a torque converter or something within the gearbox.
When was the last time the transmission was serviced?
When was the last time the transmission was serviced?
Thread Starter
Team Owner
Joined: Mar 2012
Posts: 27,118
Likes: 135
From: Montgomery, Alabama
2017 C6 of Year Finalist
I have owned it for about 3 years and don't know when the tranny was serviced last. I changed all fluids except the tranny last year. I guess I need to change the fluid and filter in it. I've heard that you should replace only half of the fluid amount. Is this correct?
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
When you drain a trans there is still a lot of fluid in the torque converter and the various passages and valves in the trans. Your trans will drip for DAYS if you take off the pan and just leave it open.
Just drain it all and replace it. Make sure you measure the level when the fluid is HOT. I found that it takes about a minute of idling after driving for the level to settle down and stay consistent.
Thread Starter
Team Owner
Joined: Mar 2012
Posts: 27,118
Likes: 135
From: Montgomery, Alabama
2017 C6 of Year Finalist
There is a myth running around that the old fluid somehow coats the trans parts and that somehow magically allows the transmission to work better. The myth says that the detergent in the new fluid washes away (to where?) the magic coating and then the trans fails.
When you drain a trans there is still a lot of fluid in the torque converter and the various passages and valves in the trans. Your trans will drip for DAYS if you take off the pan and just leave it open.
Just drain it all and replace it. Make sure you measure the level when the fluid is HOT. I found that it takes about a minute of idling after driving for the level to settle down and stay consistent.
When you drain a trans there is still a lot of fluid in the torque converter and the various passages and valves in the trans. Your trans will drip for DAYS if you take off the pan and just leave it open.
Just drain it all and replace it. Make sure you measure the level when the fluid is HOT. I found that it takes about a minute of idling after driving for the level to settle down and stay consistent.
Le Mans Master
Joined: Dec 2000
Posts: 5,761
Likes: 47
From: munising MI USA
buddy owns a transmition shop and he doesnt recomend a total flush if you have more then 60k on the existing fluid. He says its about a guarantee of a leak at least. He tells me either change it every 50k with a flush or if you have more miles then that just drop the pan and change the filter and replace the fluid you lost doing that. He makes money off of a flush and im sure hed like to make that money but is reputable enough to pass on it.
Drifting
Joined: Dec 2007
Posts: 1,647
Likes: 4
From: Argillite KY
I had some serious TCC shudder on my old '89 Silverado. I do not believe in additives but a friend of mine said to try some Lubeguard, Dr.Tranny Instant Shudder Fix. With nothing to lose I tried that and the shudder quit within 5 minutes. It did come back about 20,000 miles later and I did it again. Gone and was still working when I sold the truck.
Does the shudder happen on the 4-3 downshift. When you're cruising in 4th gear with the torque converter locked and you floor it the torque converter unlocks and you'll probably downshift into 3rd. Is that where it's shuddering?
Does the shudder happen on the 4-3 downshift. When you're cruising in 4th gear with the torque converter locked and you floor it the torque converter unlocks and you'll probably downshift into 3rd. Is that where it's shuddering?
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Thread Starter
Team Owner
Joined: Mar 2012
Posts: 27,118
Likes: 135
From: Montgomery, Alabama
2017 C6 of Year Finalist
I had some serious TCC shudder on my old '89 Silverado. I do not believe in additives but a friend of mine said to try some Lubeguard, Dr.Tranny Instant Shudder Fix. With nothing to lose I tried that and the shudder quit within 5 minutes. It did come back about 20,000 miles later and I did it again. Gone and was still working when I sold the truck.
Does the shudder happen on the 4-3 downshift. When you're cruising in 4th gear with the torque converter locked and you floor it the torque converter unlocks and you'll probably downshift into 3rd. Is that where it's shuddering?
Does the shudder happen on the 4-3 downshift. When you're cruising in 4th gear with the torque converter locked and you floor it the torque converter unlocks and you'll probably downshift into 3rd. Is that where it's shuddering?
Thread Starter
Team Owner
Joined: Mar 2012
Posts: 27,118
Likes: 135
From: Montgomery, Alabama
2017 C6 of Year Finalist
buddy owns a transmition shop and he doesnt recomend a total flush if you have more then 60k on the existing fluid. He says its about a guarantee of a leak at least. He tells me either change it every 50k with a flush or if you have more miles then that just drop the pan and change the filter and replace the fluid you lost doing that. He makes money off of a flush and im sure hed like to make that money but is reputable enough to pass on it.