Buick When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

whats that shudder @1:24? 95 buick century 480k mi

Old Sep 9, 2021 | 11:06 AM
  #1  
Muaddib78's Avatar
Thread Starter
Member
Posts like a V-Tak
 
Joined: Nov 2019
Posts: 58
Likes: 5
Muaddib78 is on a distinguished road
Default whats that shudder @1:24? 95 buick century 480k mi

audio isnt the best but its what the dashcam will do.


happens every morning, takes about a minute to happen after starting up, lasts ~ 30 seconds and almost never happens again for the rest of the day.

work done recently: air filter, fuel filter, transmission filter, MAF sensor, EGR valve, IAC valve, fuel pump, fuel sender, fuel pressure regulator, injectors radiator, water pump, upper/lower radiator hoses, thermostat, engine coolant temp sensor, plugs, wires, ignition coils.
Reply
Old Sep 9, 2021 | 12:10 PM
  #2  
carfixer007's Avatar
Senior Member


True Car Nut
 
Joined: Dec 2018
Posts: 3,239
Likes: 1,597
From: Flint, MI USA
carfixer007 is on a distinguished road
Default

I would graph the TPS and look for dropouts.
Reply
Old Sep 9, 2021 | 12:14 PM
  #3  
Muaddib78's Avatar
Thread Starter
Member
Posts like a V-Tak
 
Joined: Nov 2019
Posts: 58
Likes: 5
Muaddib78 is on a distinguished road
Default

i notice if i hold the accelerator where it is or floor it the shudder stays like it is or gets worse, if i let off the accelerator for a second or two then give it a bit of gas it clears up.
Reply
Old Sep 12, 2021 | 07:37 AM
  #4  
OldsManiac1990's Avatar
Senior Member
Posts like a Turbo
 
Joined: Apr 2016
Posts: 323
Likes: 136
OldsManiac1990 is on a distinguished road
Default

Few things
FIRST:
Did you replace those components because they were worn or did you replace them because you were trying to fix the issue with the century. if things like the plugs, wires, rad hoses were from age/mileage, thats fine. But IAC, EGR, MAF, coils, regulator, Engine temp sensor, fuel pump, injectors, etc... would you please explain that?

If you did not replace them truly because they were worn, you most definitely could have thrown parts of lower quality or defect at it, and they shouldnt be replaced just cause. now, on an older car with mileage, there is some bend to that rule because plastics and sitting and certain technology can change that from definitely do not to acceptable, but im doubting that to be the case for all of them. Brands of your new parts?
your engine has a lot of miles. do you know if your PCM is original or the PROM chip?
Like posted, the TPS is something to suspect. does your engine have a 3.8??? and do you have a 4t60e?
Reply
Old Sep 12, 2021 | 04:34 PM
  #5  
carfixer007's Avatar
Senior Member


True Car Nut
 
Joined: Dec 2018
Posts: 3,239
Likes: 1,597
From: Flint, MI USA
carfixer007 is on a distinguished road
Default

Originally Posted by OldsManiac1990
Few things
FIRST:
Did you replace those components because they were worn or did you replace them because you were trying to fix the issue with the century. if things like the plugs, wires, rad hoses were from age/mileage, thats fine. But IAC, EGR, MAF, coils, regulator, Engine temp sensor, fuel pump, injectors, etc... would you please explain that?

If you did not replace them truly because they were worn, you most definitely could have thrown parts of lower quality or defect at it, and they shouldnt be replaced just cause. now, on an older car with mileage, there is some bend to that rule because plastics and sitting and certain technology can change that from definitely do not to acceptable, but im doubting that to be the case for all of them. Brands of your new parts?
your engine has a lot of miles. do you know if your PCM is original or the PROM chip?
Like posted, the TPS is something to suspect. does your engine have a 3.8??? and do you have a 4t60e?
Good questions.
TPS was an easy call. It'* about the only thing he hasn't replaced and it can cause these symptoms.
Reply
Old Sep 13, 2021 | 06:33 PM
  #6  
Muaddib78's Avatar
Thread Starter
Member
Posts like a V-Tak
 
Joined: Nov 2019
Posts: 58
Likes: 5
Muaddib78 is on a distinguished road
Default

its the 3.1l with the 4T60E, parts replacement was due to age and mileage its pushing 480k right now.as well as the vehicle is business use and maintenance is a tax writeoff so might as well throw cash at it to save cash later.

all parts are duralast or equivalent OEM, no ebay junk

PCM is factory original as is the PROM
Reply
Old Sep 13, 2021 | 08:01 PM
  #7  
carfixer007's Avatar
Senior Member


True Car Nut
 
Joined: Dec 2018
Posts: 3,239
Likes: 1,597
From: Flint, MI USA
carfixer007 is on a distinguished road
Default

How about that TPS?
Reply
Old Sep 13, 2021 | 08:03 PM
  #8  
Muaddib78's Avatar
Thread Starter
Member
Posts like a V-Tak
 
Joined: Nov 2019
Posts: 58
Likes: 5
Muaddib78 is on a distinguished road
Default

Originally Posted by carfixer007
How about that TPS?
haven't changed it yet as it'* on the bottom of the throttlebody and it'* a bastard to get to without taking the throttlebody off which means draining the coolant first
Reply
Old Sep 16, 2021 | 06:55 PM
  #9  
Muaddib78's Avatar
Thread Starter
Member
Posts like a V-Tak
 
Joined: Nov 2019
Posts: 58
Likes: 5
Muaddib78 is on a distinguished road
Default

Pulled the tps out and replaced, problem solved.

Now onto the next problem.
Reply
Old Sep 16, 2021 | 08:12 PM
  #10  
OldsManiac1990's Avatar
Senior Member
Posts like a Turbo
 
Joined: Apr 2016
Posts: 323
Likes: 136
OldsManiac1990 is on a distinguished road
Default

Originally Posted by Muaddib78
Pulled the tps out and replaced, problem solved.

Now onto the next problem.
best way to look at it is you had to drain some coolant sure but you had the perfect time for a flush and fill with new t stat for winter and attention to the heater core for nice warmth lol
Reply

Thread Tools
Search this Thread

All times are GMT -4. The time now is 02:05 PM.