Results 1 to 17 of 17
Thread: speedometer needle jumping???
-
09-29-2011, 10:43 AM #1
speedometer needle jumping???
It works fine for a couple of mins after I start it up but once I drive after that the needle starts jumping up and down. It does not have a certain speed that it starts jumping just happens whenever. When I come to a complete stop it again jumps up and down just to reach 0. Why is this happening? Also Everything is stock.
-
10-02-2011, 05:47 PM #2
Sounds like a wiring or connection issue.
-
06-02-2012, 07:43 PM #3
- Join Date
- Jun 2012
- Location
- near Augusta, GA
- Posts
- 12
NBM- 2000 Trans Am WS6
-
06-03-2012, 10:35 AM #4
Please correct me if I'm wrong, I haven't had this issue with a newer car but is the speed sensor connected to a gear in the tranny or diff? Sometimes when those gears get stripped it can cause fluctuation. However if it doesn't go back to 'correct' after it jumps and simply bounces then I'd say it's electrical for sure.
-
06-03-2012, 10:41 AM #5
- Join Date
- Jun 2012
- Location
- near Augusta, GA
- Posts
- 12
NBM- 2000 Trans Am WS6
-
06-03-2012, 02:12 PM #6
The only time I saw that happen on my car was a bad alt. And it went crazy continously. You may have a bad BCM. Body Control Module.
-
06-03-2012, 03:21 PM #7
- Join Date
- Jun 2012
- Location
- near Augusta, GA
- Posts
- 12
NBM- 2000 Trans Am WS6
Is the BCM physically located under the hood or in the passenger compartment?
My speedo needle falls when I gradually push on the gas. If I push the gas down hard, it doesn't tend to do it. At lower speeds, it will cause the transmission to downshift. That's really annoying. It's been doing it for quite a while.
-
06-04-2012, 10:03 AM #8
-
06-04-2012, 11:09 AM #9
- Join Date
- Jun 2012
- Location
- near Augusta, GA
- Posts
- 12
NBM- 2000 Trans Am WS6
-
06-04-2012, 11:18 AM #10
you wern't joking when you said a while! well i guess that rules out that as a possibility...
2002 Trans Am WS.6 A-4:
Volant CAI, BBK LTs, BBK ORY, SLP LM2, FROST Tune, A/C Heat Delete, AIR Delete
-
06-04-2012, 01:08 PM #11
I don't have much more to add. I do know that your speedo doesn't have a cable running to the instrument cluster. The cluster just snaps into a wire connector. I would think that somewhere in the tranny there is an actual gear. Maybe that is your problem. Stripped out, or skipping. I reread your first post, and I would say that it most likely is your BCM. It is located up in front of pass foot well. I have no experience with it, but have seen many threads about it. http://www.ls1.com/forums/f6/radio-p...e-time-165868/ Here's one. http://www.ls1.com/forums/f6/electrical-problem-165491/ Here's another one with some helpful pics from Smittro.
-
06-04-2012, 04:41 PM #12
- Join Date
- Jun 2012
- Location
- near Augusta, GA
- Posts
- 12
NBM- 2000 Trans Am WS6
-
06-07-2012, 12:43 PM #13
- Join Date
- Jun 2012
- Location
- near Augusta, GA
- Posts
- 12
NBM- 2000 Trans Am WS6
I got the ECM and installed it. Very straightforward, easy install. Car drove a little funny the first couple miles while the computer was learning. Unfortunately, today is very cool outside so there's no way for me to know yet if it fixed the speedometer problem.
-
06-07-2012, 04:06 PM #14
Keep us posted, im sure this will help someone else down the road.
-
06-07-2012, 04:50 PM #15
- Join Date
- Jun 2012
- Location
- near Augusta, GA
- Posts
- 12
NBM- 2000 Trans Am WS6
Here's a video that shows what happens with the speedo needle. I made the video last month while driving down the interstate.
http://img100.imageshack.us/img100/9810/47c.mp4
-
06-08-2012, 06:56 PM #16
- Join Date
- Jun 2012
- Location
- near Augusta, GA
- Posts
- 12
NBM- 2000 Trans Am WS6
Bad news! The new ECM did not fix the problem. I may just take the car to a shop to have it fixed. No sense in continuing to guess at the cause of the problem. May take a little while though. Our other vehicle got hail damage this week and we just dropped it off for repair.
-
06-19-2012, 06:43 PM #17
- Join Date
- Jun 2012
- Location
- near Augusta, GA
- Posts
- 12
NBM- 2000 Trans Am WS6
Update - after a few days, the new ECM started doing crazy stuff: the AC wouldn't work, the car ran bad and wouldn't start when hot. I pulled the new ECM and put the old one back in. Now the car is right back to where it was before - the speedo needle jumps but otherwise the car works fine. No returns on the ECM so I guess that's just money wasted.
Thread Information
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
Similar Threads
-
Improving Pontiac Speedometer Accuracy - Speedometer Super-T
By Ed Blown Vert in forum Firebird / WS6Replies: 0Last Post: 02-27-2012, 09:10 PM -
maybe jumping ship
By brendan.9 in forum Almost Anything GoesReplies: 14Last Post: 04-01-2011, 11:28 AM -
Spark jumping
By Durango in forum External EngineReplies: 2Last Post: 06-03-2009, 02:18 PM -
Help: Speedometer needle stopped working?
By onetroubledguy in forum Firebird / WS6Replies: 9Last Post: 01-10-2009, 02:51 PM -
Boat Jumping
By ls1camino in forum Almost Anything GoesReplies: 3Last Post: 08-19-2008, 11:42 PM
Bookmarks