Acceleration power loss - HELP! - AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand


Go Back   AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand > JEEP GARAGE > JK Wrangler Australia


Portal Register Forums Trading Your Jeep New Garage Mark All Read

Post New Thread  Reply
 
Thread Tools Search this Thread
  #1  
Old 6 Days Ago
Joshua Walker  Joshua Walker is offline
I just registered
 
Join Date: Apr 2019
Posts: 2
What Jeep do I drive?: JK
Likes: 0
Liked 0 Times in 0 Posts
Default Acceleration power loss - HELP!

Hi guys, just after a bit of advice as I'm near my wits end with my 09 JK.

For about a year now I've had an issue where about a minute after ignition I won't be able to accelerate any faster than the current speed I'm at. This only seems to happen at slower speeds, say when I'm in a 50-60km area, and it usually kicks in when I have to slow right down eg. to give way at an intersection. If I've still got a bit of momentum, I can usually keep it going at around 20km/h. After about 10 seconds, my engine light will flash along with the audible ding, and suddenly it's like a rush of fuel comes back and away we go again as if nothing happened. If my speed is too slow and I can't keep it moving, I just roll to the side of the road out of the way of traffic, turn the ignition off and back on, and most of the time that fixes things until next time.

I've experimented sticking the accelerator flat to the floor whenever this happens, it makes zero difference to my speed, and usually results in a pop/light bang sound coming from who knows where. Then when we're back to normal, you can smell the excess fuel from having had my foot down, like there's been a major blockage. What confuses me is how restarting the ignition or just waiting it out seems to fix things.

Not long before this all started, I had an O2 sensor error code (can't recall which sensor). My local mechanic believed this wasn't related so I didn't pursue replacing it at that point. I'd also been getting "multiple misfire" codes (hence the engine light flashing/dinging) from whenever the power loss occurred, so had all the spark plugs replaced, which has fixed the misfiring, but the power loss remains.

Took it into a Jeep dealer for a closer inspection, they say there's no voltage coming from any of the O2 sensors, and they're guessing the PCM is the issue and needs replacing. Three mechanics and a couple of grand later, I'm hesitant to keep throwing money at it. I'm scared to even trade or sell it on as I'd hate for someone to lose power in the middle of an intersection (as I have a few times now). So I'd appreciate any advice or ideas. I'm not great when it comes to the tech side of vehicles, so let me know if I've not made anything clear or you need more info.

Last edited by Joshua Walker; 6 Days Ago at 09:33 PM.
  #2  
Old 6 Days Ago
spoondog  spoondog is offline
Established Member
 
Join Date: Apr 2015
Location: Townsville
Posts: 201
What Jeep do I drive?: JK
Likes: 6
Liked 58 Times in 34 Posts
Default

Have you tried changing the crank angle sensor? I was getting some hesitation in my JK, replaced the crank angle sensor and that fixed it. $30 delivered from RockAuto. Or if you pm me your address I can send you my old one to see if it improves it any. Mine only had a slight hesitation nothing to the extent of yours. It only takes 5 min to change and could rule out another potential problem.

Sent from my SM-T805Y using Tapatalk
Sponsored Posts
  #3  
Old 6 Days Ago
Joshua Walker  Joshua Walker is offline
I just registered
 
Join Date: Apr 2019
Posts: 2
What Jeep do I drive?: JK
Likes: 0
Liked 0 Times in 0 Posts
Default

Legend, thanks spoondog, PMing you now.

I'm also going to try unplugging all four O2 sensors to see if that makes any difference.
Post New Thread  Reply


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 On


» Advertisements_AS2


Powered by vBadvanced CMPS v3.2.3



All times are GMT +10. The time now is 12:49 PM.




AJOR does not vouch for or warrant the accuracy, completeness or usefulness of any message, and are not responsible for the contents of any message. The messages express the views of the author of the message, not necessarily the views of AJOR or any entity associated with AJOR, nor should any advice be substituted as technical advice replacing that of a mechanic. You agree, through your use of this service, that you will not use AJOR to post any material which is knowingly false and/or defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, religious, political or otherwise violative of any law. You agree not to post any copyrighted material unless the copyright is owned by you or by AJOR. The owner, administrators and moderators of AJOR reserve the right to delete any message or members for any or no reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold harmless AJOR, the administrators, moderators, and their agents with respect to any claim based upon transmission of your message(s). The use of profile signatures to intentionally mislead or misdirect any member on this forum is not acceptable and may result in your account being suspended. Any trip that is organised through the AJOR forum is participated at your own risk. If you or your vehicle is damaged it is your responsibility, not that of the person that posted the thread, message or topic initiating the trip, nor the organisers of AJOR or moderators of any specific forum. This forum and associated website is the property of AJOR.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

AJOR 2002 - 2019 AUSJEEPOFFROAD.COM. All corporate trademarked names and logos are property of their respective owners. Ausjeepoffroad is in no way associated with DaimlerChrysler Corporation or Fiat Jeep.
www.ausjeep.com www.ausjeep.com.au www.midlifemate.com ausjeepforum.com Jeep Wrangler JL Australia release
vB Ad Management by =RedTyger=