Faulty cruise or o/d issue? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 09-17-2007, 03:45 PM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Aug 2007
Location: Victoria, B.C. Canada
Posts: 32
Thanked 0 Times in 0 Posts
backhoe is on a distinguished road
Default Faulty cruise or o/d issue?

My bonnie seems to shift into o/d even when the shifter is in d-3, and not in the o/d position, and at hwy speed under acceleration it will shudder until I give it enough throttle to kick it down a gear. I just took this car on a road trip this weekend and thought I may be possibly experiencing a fuel delivery issue as well.I loaded some STP injector cleaner before I left, as I have also noticed some shudder at low speeds as well. Any troubleshooting tips would be much appreciated, as this car is relatively new to me, and I plan to change the f/f first, and possibly the O2 sensor, because the car seems to run rich.
Thanks
backhoe is offline   Reply With Quote
Old 09-18-2007, 01:22 AM   #2
Senior Member
Certified GM nut
 
Join Date: Jan 2007
Location: allentown, pa--brooklyn, ny
Posts: 1,646
Thanks: 0
Thanked 0 Times in 0 Posts
88bonnsse is on a distinguished road
Default

sounds like a gear is slipping in my opinion. may need to take it to a tranny shop for a free estimate. but im sore some more advanced members will chime in and help with other great solutions...
88bonnsse is offline   Reply With Quote
Old 09-18-2007, 03:18 AM   #3
Senior Member
Posts like a Camaro
 
Join Date: Jan 2003
Location: Jenison, MI (Near Grand Rapids)
Posts: 1,070
Thanks: 0
Thanked 0 Times in 0 Posts
theJMFC is on a distinguished road
Default

Are you sure it'* going into OD, and it'* not just the TCC lockup that you're feeling as that fourth shift?

As a test, if you're driving down the road at around 55-65 in "3", and shift it into "OD", you should feel it shift, or hear the RPMs come down. If not, something is up.

It almost sounds like a TCC lockup shudder issue, though I didn't think that was very common at all on these older non-electronic transmissions. The lockup was very abrupt on these things. On newer models, they made it a smooth engagement, and as a byproduct, introduced more slippage... and wear.

The shudder at low speeds: Do you mean at about 35 mph, and again at about 45-50? Those would be speeds where the transmission has just shifted into a higher gear, and so the engine isn't revving very high at all. If you are in need of a tuneup, you will feel some shudder or surging at these speeds. If that'* all it is, new plugs and wires (if necessary) might solve that issue. Might solve the high-speed problem as well, if the transmission is working properly.
theJMFC is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Faulty crank sensor interferes with cruise control PaulDFixr 1992-1999 1 07-14-2007 08:32 AM
faulty Gas Gauge!!! OLBlueEyesBonne 1992-1999 8 08-08-2005 09:08 PM
Faulty Windshield Washer Pump? Merlin 91/97 1987-1991 6 07-30-2004 05:45 AM
Faulty Injectors/Fuel system & backfiring... bonnie94ssei General GM Chat 4 02-06-2004 09:43 PM
How do i check for a faulty o2 sensor? Paulnold 1992-1999 15 05-10-2003 08:44 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:00 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.