Hard shifting at times?

T_Reiner

Junior Member
Location
Los Angeles, CA
I have a '95 C2500 4x4
Around 100,000 miles
Last week the "sevice engine soon" light came on and the tranny shifts hard into gear?especially 1st to 2nd
Also when in neutral it idles around 2500 rpms

I've seen some simalar posts refering to a Vacume modulator?
Any help would be nice.

Thanks
 

John DiMartino

PlowSite.com Veteran
Location
Walden,NY
You dont have a vacuum modulator,you have an electronically controled tranny,it sounds like you have a bad sensor,likely the CTS,TPS,or MAP sensor.Hopefully thats all it is,get it to a trans shop,or the dealer ASAP before you do more damage.
 
OP
T

T_Reiner

Junior Member
Location
Los Angeles, CA
right on !!

You hit the nail on the head John,
It was the TPS, little bugger was bad
making the system think it should Idle around 3000 rpms
Cheep enough fix
Thanks for the heads up
 
Top