Car jolts? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


General GM Chat When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made. Chat about all things GM (and related cars). Off-topic stuff should be in the Lounge, and all Model specific mechanical problems should be posted in the proper forum.

Reply
 
 
 
Thread Tools Search this Thread
Old 07-13-2012, 02:01 PM   #1
Senior Member
Posts like a Turbo
Thread Starter
 
espee1989's Avatar
 
Join Date: Dec 2010
Location: New York City
Posts: 394
Thanks: 0
Thanked 0 Times in 0 Posts
espee1989 is on a distinguished road
Default Car jolts?

So, last week, during the hottest days of the year so far, my car had three separate occasions where it jolted forward over 4 days, and I am wondering if anyone can help me figure out what could be wrong.

What pretty much happened was that the car would be at a low speed and when I'd start to accelerate, the car would jolt, this happened twice going uphill, and one on level ground, as I was going under an open fire hydrant (if that matters?).

I imagine it could be any number of things, but it hasn't done this since, and it only happened in the city. Between the occurrences, I drove on the highway and there was no problem for 50 miles. The day after that, I go through stop and go traffic in 100 degree weather and the jolt reappears. Any ideas?
espee1989 is offline   Reply With Quote
Old 07-13-2012, 02:28 PM   #2
BANNED
Posts like a Supercharger
 
Join Date: Aug 2009
Location: Wahpeton, North Dakota
Posts: 183
Thanks: 0
Thanked 0 Times in 0 Posts
zigger21 is on a distinguished road
Default

This could be caused from an oxygen sensor, or a faulty spark plug or wire. If its on a Chevey impala it may be a solenoid in the transmisson that maybe faulty. If it only happens in the city my guess would be oxygen sensor but I would have a shop check them out because they are not cheap to replace on a guess. I would change the plugs and wires if you havent had a tune up in awhile. Change the fuel filter, air filter plug and wires. Thats only if you have'nt had a tune up in awhile
zigger21 is offline   Reply With Quote
Old 07-13-2012, 06:06 PM   #3
Senior Member
Posts like a Turbo
Thread Starter
 
espee1989's Avatar
 
Join Date: Dec 2010
Location: New York City
Posts: 394
Thanks: 0
Thanked 0 Times in 0 Posts
espee1989 is on a distinguished road
Default

The plugs and wires were changed last fall and the rear o2 sensor was changed a year and a half ago, but all of the other things haven't been. I've been wondering if it was all those things as well, but I also want to throw in the possibility that it could be my catalytic converter? Theres a code for it not reaching the threshold or whatever not being reached, could the cat be done and/or fouling the o2 sensor? I'm tired and have work to do tonight, but I'll go out tomorrrow and see what codes there are.
espee1989 is offline   Reply With Quote
Old 07-13-2012, 06:57 PM   #4
Senior Member
Certified GM nut
 
2k2cse's Avatar
 
Join Date: Jan 2011
Location: Newfoundland, Canada
Posts: 2,112
Thanked 18 Times in 17 Posts
2k2cse has a spectacular aura about2k2cse has a spectacular aura about
Default

Is the SES light flashing? Do you notice a lack of power when trying to accelerate?
2k2cse is offline   Reply With Quote
Old 07-13-2012, 07:03 PM   #5
Senior Administrator


Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,641
Thanked 995 Times in 772 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

I really don't think an O2 sensor could cause such an erratic condition that your car is exhibiting. Usually they just fail and you will notice a difference in the smell of your exhaust(rotten egg) maybe and a difference in fuel mileage.

Also, if you do have codes, we pretty much need them before we can continue troubleshooting.
Mike is offline   Reply With Quote
Old 07-13-2012, 07:14 PM   #6
BANNED
Posts like a Supercharger
 
Join Date: Aug 2009
Location: Wahpeton, North Dakota
Posts: 183
Thanks: 0
Thanked 0 Times in 0 Posts
zigger21 is on a distinguished road
Default

I agree with Mike if its an 02 sensor it would be faulty all the time and not just everyonce and awhile. Also you could check your coil packs terminals for rust or corrosion which would indicate a loose connection causing loss of power/
zigger21 is offline   Reply With Quote
Old 07-16-2012, 09:58 AM   #7
Senior Member

True Car Nut
 
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

Another thing that can caused jolting when accelerating from a low speed is the throttle position sensor. Here is an excellent article on trouble shooting the TPS:

Part 1 -Throttle Position Sensor (TPS) Test: GM 3.8L (P0121, P0122, P0123).
2kg4u is offline   Reply With Quote
Old 07-20-2012, 10:46 AM   #8
Senior Member
Posts like a Turbo
Thread Starter
 
espee1989's Avatar
 
Join Date: Dec 2010
Location: New York City
Posts: 394
Thanks: 0
Thanked 0 Times in 0 Posts
espee1989 is on a distinguished road
Default

Sorry its taken a while to get back to you guys. The codes I have are po128, po420 and po446
espee1989 is offline   Reply With Quote
Old 07-20-2012, 04:29 PM   #9
Senior Administrator


Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,641
Thanked 995 Times in 772 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

P0128. Coolant thermostat. The PCM is detecting that the engine is not reaching optimum operating temperature. Possible due to thermostat stuck open.




A code P0420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • A damaged or failed oxygen sensor (HO2S)
  • Downstream oxygen sensor (HO2S) wiring damaged or connected improperly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
  • Leaking fuel injector or high fuel pressure
  • Cylinder misfire
  • Oil contamination
And your P0446

Faulty vent valve
Open, short or excessive resistance on Vent valve control circuit
Blockage of vent valve
Mike is offline   Reply With Quote
Old 07-20-2012, 05:10 PM   #10
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

so i would change the thermostat and coolant, clear the codes and see. the o2 and running weird could be from not being up to temp.

the vent valve probably needs cleaned and shoot some wd40 in and actuate it with a battery a few times see if it works
jwfirebird is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
car dies while driving. and car jolts foward? PROBLEM FIXED. 88bonnsse 1992-1999 56 07-11-2007 01:16 AM
car is hard to start when car is cold zo6vette 1992-1999 16 01-27-2005 01:51 AM
Collector car a must see!!!!!!! Most expensive BIN car!!! killer_cr80r Lounge 6 07-30-2004 10:48 PM
THE PICTURES ARE HERE OF MY LIFE AND MY CAR AND CAR LIFE.... killer_cr80r Lounge 11 05-24-2004 12:24 AM
Car cuts off...Turn the wheel and car starts up 95BonnevilleSESC 1992-1999 2 02-20-2004 02:50 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 01:19 AM.


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.