Jeep accelerates faster when cold? - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 06-23-2012, 12:37 PM   #1
Jeeper
 
mtb011's Avatar
 
Join Date: Dec 2011
Location: Fburg
Posts: 20
Question Jeep accelerates faster when cold?

I've started to notice my jeep actually accelerates/pulls itself much faster cold then when the engine is warmed up, then when it warms up it feels noticeably slower. Has anyone else experienced this before?/could it be foreshadowing a mechanical issue? -1999 Wrangler sport, I6 manual

mtb011 is offline   Quote
Old 06-23-2012, 01:23 PM   #2
Jeeper
 
Donkerz's Avatar
 
Join Date: Mar 2012
Location: Belize
Posts: 206
Could be a cracked head causing low compression when warm since the crack expands, check stamp on side of engine and see if it's the ll-fated 0331 that cracks almost certainly between 50-100k miles. good luck

__________________
Just because you can doesn't mean you should.
Donkerz is offline   Quote
Old 06-24-2012, 09:48 AM   #3
Jeeper
 
jgorm's Avatar
 
Join Date: May 2010
Location: San Diego
Posts: 1,924
ITs common on most vehicles. The air is denser, and most ECUs will add timing when the coolant temp is below about 40-150 depending on the engine and brand. But its not good to beat on cold engines! Let the pistons expand for good ring seal.
__________________
my 06 LJ rubicon
2.5" SL, 1" BL, DIY highline, 35s with double beadlocks.
jgorm is offline   Quote
Old 06-24-2012, 09:58 AM   #4
Jeeper
 
Vroooom's Avatar
 
Join Date: Jun 2010
Location: Sin-Tex
Posts: 1,715
make sure your airbox (air filter container) is intact and you arent asperating heated air from the engine compartment.

As stated above, cool air expands more during combustion (more power) and warm air expands less (less power).

If your intake is breathing hot air from the engine compartment..as the engine warms up...the surrounding air gets hotter...expands less during combustion...you get less power.

No. Im not advocating the Cold Air Intake gimmicks....just make sure what you have is connected properly.
__________________
Threads wander aimlessly....always refer back to post #1
2012 Black Unlimited Sahara (mine)
2011 Black Corvette 3LT (wife's)
2005 Black Suzuki C50T (ours)
"Hope" is NOT a strategy
Vroooom is offline   Quote
Reply

Tags
cold , engine , power , speed

Thread Tools

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




Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 11:25 PM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC