All times are UTC - 6 hours [ DST ]




Ask A Question Reply   
Author Message
 

contributions: 2
I have a 2003 Montana with 220,000 miles. When the engine warms up the idle will increase from a normal of about 600 rpm to 1500 or more. The transmission shifts at over 3000 rpm, transmission was rebuilt at 190,000 miles problem was there prior. While sitting at a light it may reduce rpms to normal or not. I have had the throttle body cleaned, checked for vacuum leaks none found, replaced the TPS. I have checked the wiring harness for issues and found no issues.


   
Reply with quote  
* Search   
 
User avatar

contributions: 2275
Images: 37
Location: Oregon
Is the check engine light on?

If the check engine light is on it will affect the transmission shifts.

for the idle problem I would connect to a scanner and look at you idle air counts, fuel trims and even though you replaced the TPS, I would look at that reading too.

There have been times when the pcm was bad causing problems like this too but you want to make sure everything else is good first.

Have you tried a hard reset for the computer?


   
Reply with quote  
 

contributions: 2
The check engine light is not on.
I have a scanner so I will take a look the items you suggested.
How do you do a hard reset on the computer?


   
Reply with quote  
 
User avatar

contributions: 2275
Images: 37
Location: Oregon
You can do a hard reset by disconnecting your battery ground cable.
here is a video
https://www.youtube.com/watch?v=W_7Ehz1rdY0

afterwards you will need to drive it around for a while for the computer to relearn everything


   
Reply with quote  
Ask A Question Reply   

   Similar Topics   Author   Replies   Views   Most Recent 
New Articles View the first Pontiac Montana will not idle after head gaskets

in Pontiac Montana

jsnider

1

1653

Thu Dec 20, 2012 8:26 pm

ProTech View the latest

New Articles View the first Pontiac Montana Wont Idle after intake gaskets replaced

in Pontiac Montana

Konnichiwa

1

1292

Sun Dec 23, 2012 11:17 pm

ProTech View the latest

New Articles View the first Fast Idle, drives without touching gas pedal

[ Go to page: 1, 2 ]

in Oldsmobile

amora

10

7845

Tue Jun 21, 2016 1:02 am

carriedi View the latest

New Articles View the first low idle when warm

in Oldsmobile

tfortom

1

1016

Mon May 20, 2013 3:22 pm

ProTech View the latest

New Articles View the first Pontiac Montana 3400 Timing Off

in Pontiac Montana

johnpaint71

1

1991

Sat Jun 19, 2010 10:39 pm

Meccboy View the latest

New Articles View the first 2003 Pontiac Montana O2 sensor removal

in Pontiac Montana

thoric

2

1684

Thu Mar 13, 2014 7:36 am

thoric View the latest

New Articles View the first Pontiac Montana hesitation and govenor sensor

in Pontiac Montana

d bonn

1

1786

Mon May 24, 2010 10:27 pm

BillGMTech View the latest


All times are UTC - 6 hours [ DST ]



Search for:
Jump to:  
Contact Us