Engine misfire disappeared - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 07-15-2013, 10:23 AM   #1
Senior Member

True Car Nut
Thread Starter
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,804
Thanked 220 Times in 181 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default Engine misfire disappeared

When driving at a steady speed of 60 to 70 MPH, if I tried to accelerate slightly the engine would buck a bit. If I accelerated more aggressively it would kick down a gear and there would be no bucking. I originally thought it was a transmission problem, but came to believe it might be a bad throttle position sensor. I changed the TPS last this past weekend, and the bucking problem was eliminated. Not only that, throttle response is hugely improved. If feels like the car woke up a little.

Now the strange part.

My Bonneville has had a single cylinder misfire that has been getting worse over the last couple of weeks. It would stumble under WOT, but the CEL did not flash and it did not throw any codes. My LS1M scanner will scan for misfires, so after I installed the new TPS I hooked up the scanner and went for a ride. No misfires. I scanned all the way to work this morning, including a few WOT'* up to 80 MPH, and not one single misfire.

All I did was change the TPS. How can that correct a misfire? Maybe it was just the temperature and humidity conditions this morning and the misfire will come back, but I don't think so.
2kg4u is offline   Reply With Quote
Old 07-15-2013, 11:09 AM   #2
Retired Administrator

True Car Nut
 
GunsOfNavarone's Avatar
 
Join Date: Apr 2009
Location: Williamsport, PA
Posts: 2,856
Thanked 167 Times in 129 Posts
GunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud of
Default

Roy,

Good stuff. Wonder if replacing the TPS at 200k is a good preventative maintenance action.
GunsOfNavarone is offline   Reply With Quote
Old 09-18-2013, 10:51 PM   #3
Junior Member
 
Join Date: Sep 2013
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
smadd38 is on a distinguished road
Default

Quote:
Originally Posted by GunsOfNavarone View Post
Roy,

Good stuff. Wonder if replacing the TPS at 200k is a good preventative maintenance action.
Our car does the same thing except the RPM'* would go down to 0 and then back up. Replaced the TPS but still doing it. Any suggestions? We have replaced The MAF Checked all and I mean all the wiring. Even went as far to changed the PCM in it. It seems to effect the car more at lower speed.
smadd38 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Calling all engine gurus-Help w/rough idle, misfire, knock Daron97SSE 1992-1999 26 11-29-2005 03:43 PM
DTC P0300 Engine Misfire Detected Wargamer 1992-1999 26 05-01-2005 02:57 PM
2K SSEi Engine misfire Ricky5.0L 2000-2005 22 09-22-2004 03:43 PM
Engine misfire? Or something else Luke Greffen 1992-1999 9 07-03-2003 02:39 AM
Engine Misfire - safe to drive? StoopidSavant 1992-1999 12 12-23-2002 02:23 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 04:23 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.