1998 Chevy Lumina jerking

JAY_89

MEMBER
1998 CHEVROLET LUMINA
6 CYL
FWD
AUTOMATIC
86,000 MILES

Hi I have a chevy lumina 98 with 86000 miles on it
from last couple of weeksi am facing some problem with transmission
when the engine of my car is cool it runs fine but when the temperature reaches upto normal it jerks the first gear only and secondly when im driving at a constant speed like 50 mph and I want to go for more speed it changes the gear from 4th to 3rd than 3rd to 4th it happens for 1 or 2 secsthan it changes and if I am at 50 and I pump the gas harder it doesnt happens it only happens when you want to increase speed gradually
i took my car to 3 tranny specialists and all of them said there is no mechanical or electrical fault in my car
1 said change the whole tranny but if I dont know the exact problem how can I change the tranny

9 Replies

BILLYMAC

MECHANIC
2,204 POSTS

Hi, there is a cable that goes to your throttlebody it is connected where your accellerator cable connects there is a lock that you push down to release so you can adjust this cable.

Adjusting this cable actually adjust the throttlevalve pressure, which adjust the shift pattern this cable should be checked for binding or fraying. Other then that you can service the trans. New filter and fluid

good luck billymac

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Tuesday, June 2nd, 2009 AT 8:15 PM

JAY_89

MEMBER
5 POSTS

Thanks for the information but I guess I cant do that by my self howevere the transaxle oil is perfect, I dont know abt transmissiom filter, can you tell me how to check transmission filter
and if I want this work to be done do I have to take my car to a mechanic or transmission center?
And onething more do the spark plugs have to do any thing with this? Or coiltovers?
Thnx

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Tuesday, June 2nd, 2009 AT 9:34 PM

BILLYMAC

MECHANIC
2,204 POSTS

Hi if the fluid is clean and red filter is ok.
The coils or wires will cause jerking, but usually not just in first gear. If you have old wires yes I would do a tune up. And any shop can adjust the throttlevalve cable and check it. Good luck billymac

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Wednesday, June 3rd, 2009 AT 5:31 PM

JAY_89

MEMBER
5 POSTS

Thnx for you reply
couple of things more
how much will it cost me the throttle body thing
coz I dont want to spend 400 or 500 dollars on this car and secondly if I dont fix this prob for how long I can drive it
i changed my gas and now the prob is I guess 70% finished first it was happening quite often now it doesnt happens until you really want to do that?
I got my car checked and coil towers have some white spot in them so is that mean its bad?

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Wednesday, June 3rd, 2009 AT 5:54 PM

BILLYMAC

MECHANIC
2,204 POSTS

Hi if burnt spots on coils or white spots wires are bad. It should only cost a half hour labor to adjust cable. But if gas changed anything won, t be the trans. Replace wires billymac