why is it taking longer and longer to start? - JeepForum.com

 
LinkBack Thread Tools
post #1 of 10 Old 06-28-2009, 09:55 PM Thread Starter
wmeyer116
Registered User
1997 TJ Wrangler 
 
Join Date: Jan 2009
Location: Chattanooga TN
Posts: 898
why is it taking longer and longer to start?

So recently my tj has been been taking a while to start. It turns over fine, but it just takes a really long time.

sometimes it is faster if i turn the key and let it try for a few seconds, stop, then turn it again, and it will start eventually.

when it actually does start, it kinda sputters at first and has trouble getting up to an idle, but then a couple of seconds later it does just fine, and everything is normal.

spark plugs only have a couple thousand miles, air filter is brand new

ideas?


Quote:
Originally Posted by never monday View Post
Marcus,
Leave your inbred childish comments somewhere else. They are not welcome on JF
wmeyer116 is offline  
Sponsored Links
Advertisement
 
post #2 of 10 Old 06-28-2009, 10:01 PM
theGiantPanda
Swap This...
 
theGiantPanda's Avatar
2006 LJ Wrangler 
 
Join Date: May 2009
Location: SE Michigan
Posts: 1,582
its a fuel pressure issue, do a search on it and you should be able to find it. there was a pretty good thread about it and key things to check just the other day.

basically, your fuel pressure is leaking down while the jeep is sitting and it takes a minute to build the pressure back up to 'start' the jeep. that is also why it sputters. most commonly the pressure valve goes bad and lets the fuel drain back into the tank. you can leave the key forward for a second or two before trying to start it to allow the fuel pump to build up pressure before you try and start it.

Quote:
Originally Posted by CCJ View Post
Jesus. This is what heaven on 4 wheels looks like.
Quote:
Originally Posted by Deacon View Post
Hospital? What, are you suffering from Overextended Jeepaphelia or something? :)
I've never been poor, only broke. Poor is a state of mind. Broke is a condition brought on by Jeep ownership and a heavy right foot.

2006 Unlimited Redicon Panda Edition
RRI Long Arm...14" Fox CO's Front and Rear...D60 KP Front and D60 FF Rear... 5.38s spooled...40" Maxxis Trepadors...
6.1 HEMI...Atlas 5.1

5.7 HEMI 400 hp TJ Build http://www.jeepforum.com/forum/f9/ye...17/?highlight=
6.1 HEMI Ultimate LJ Rubicon Build http://www.jeepforum.com/forum/f9/6-...ayhem-1013800/
2.5 to 4.0L swap and build up http://www.jeepforum.com/forum/f9/he.../#post14946167
4.0 to 2008 5.3L GM LS in the Taco'd TJ [frame off build].....http://www.jeepforum.com/forum/f9/5-...28/?highlight=
My new DD Build, lift, 4.0 motor swap, done in 6 days?....http://www.jeepforum.com/forum/f22/6.../#post15716292

the new shop... http://redrockwiring.com/ conversion, parts and wiring systems
shop email.... info@redrockindustries.net
LIKE US on facebook..... https://www.facebook.com/redrockindustriesinc adding more daily
redrockindustries.net
theGiantPanda is offline  
post #3 of 10 Old 06-28-2009, 10:06 PM Thread Starter
wmeyer116
Registered User
1997 TJ Wrangler 
 
Join Date: Jan 2009
Location: Chattanooga TN
Posts: 898
really? how hard is it to replace the valve?

Quote:
Originally Posted by never monday View Post
Marcus,
Leave your inbred childish comments somewhere else. They are not welcome on JF
wmeyer116 is offline  
post #4 of 10 Old 06-28-2009, 10:25 PM
little_Jeep
Registered User
1998 TJ Wrangler 
 
Join Date: Nov 2006
Location: Louisville, KY
Posts: 5,965
I think this is the thread that Panda is talking about........

http://www.jeepforum.com/forum/f9/starting-issues-cranks-few-times-before-fire-710025/
little_Jeep is offline  
post #5 of 10 Old 06-28-2009, 10:41 PM
DanaJeepTech
Registered User
2002 TJ Wrangler 
 
Join Date: May 2009
Location: Cleveland
Posts: 88
I would connect a fuel pressure gauge and take a reading. Normal fuel pressure running is between 44 and 54 psi. After shut down you want to maintain atleast 24 psi after 5 minutes. If you are leasking down faster, fuel is either flowing back to the tank through a bad pressure regulator or through a stuck open injector.

Later model TJ's (2000-2004) had an issue with injector number three where fuel vapor would get trapped in the injector from exhaust heat. You would get a pretty noticiable misfire for the first minute after a hot soak and I had seen where it cause a longer crank time too although that was less common.

-Dana
DanaJeepTech is offline  
post #6 of 10 Old 06-29-2009, 06:11 AM
TheBoogieman
Disturbed.
 
TheBoogieman's Avatar
2003 TJ Wrangler 
 
Join Date: Aug 2006
Location: CharlottesHELL
Posts: 33,161
Leaking anti drainback valve.http://dailydriventj.com/fuel_pump.shtml
TheBoogieman is offline  
post #7 of 10 Old 06-29-2009, 09:19 AM
jgorm
Web Wheeler
 
jgorm's Avatar
2006 LJ Wrangler 
 
Join Date: Aug 2007
Location: San Diego
Posts: 2,355
Sometimes we remove the anti drain back valves (pprv) on high powered mustangs (its a major restriction and we get almost another 10% duty cycle, as well as removing a hesitation issue). The key is to turn the key to on for about 2 seconds before starting. If you are on a hill (nose up) then you can turn the key to on, off, on, then start and it will prime the system faster.
jgorm is offline  
post #8 of 10 Old 06-29-2009, 10:27 AM
Scotch740
Web Wheeler
 
Scotch740's Avatar
2005 LJ Wrangler 
 
Join Date: Apr 2004
Location: Charlottesville VA
Posts: 2,334
That was the first sign of my battery dieing.

To determine if the fuel drain back is the issue turn you key on for a few seconds (5 or so). That lets your fuel pump prime the fuel. Then try to start it. If that is the problem your jeep should start right up.
Scotch740 is offline  
post #9 of 10 Old 06-29-2009, 11:29 AM
Jerry Bransford
Administrator
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California
Posts: 65,011
Quote:
Originally Posted by jgorm View Post
Sometimes we remove the anti drain back valves (pprv) on high powered mustangs (its a major restriction and we get almost another 10% duty cycle, as well as removing a hesitation issue). The key is to turn the key to on for about 2 seconds before starting. If you are on a hill (nose up) then you can turn the key to on, off, on, then start and it will prime the system faster.
Removing that check valve would allow all of the fuel to drain back down into the fuel tank and in the TJ's case, turning the key on two seconds before turn it to Start won't be nearly enough time to get the fuel back up to the fuel injectors. Removing that check valve would be a bad idea in the TJ's case.

Getting Savvy...

When you have a choice, buy American.
Jerry Bransford is offline  
post #10 of 10 Old 06-29-2009, 11:41 AM
jgorm
Web Wheeler
 
jgorm's Avatar
2006 LJ Wrangler 
 
Join Date: Aug 2007
Location: San Diego
Posts: 2,355
Quote:
Originally Posted by Jerry Bransford View Post
Removing that check valve would allow all of the fuel to drain back down into the fuel tank and in the TJ's case, turning the key on two seconds before turn it to Start won't be nearly enough time to get the fuel back up to the fuel injectors. Removing that check valve would be a bad idea in the TJ's case.
I don't know too much about the jeeps fuel pump, but all the fuel drains out of my lines on the mustang too (pressure drops to 0 within 1 sec of key off). But then i have 2 high powered pumps and 2 sec of key on before starting works every time. I just gave this as a suggestion that it won't really cause any trouble if the OP doesn't fix it, other than a harder start and possible rough running for a few seconds.
jgorm is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Takes longer to start up.... superslayer TJ Wrangler Technical Forum 10 08-12-2011 07:39 AM
Changed oil, now engine takes longer to start. SqueakyYJ YJ Wrangler Technical Forum 7 05-13-2009 10:47 PM
Starting issue...taking longer to crank dbdragracing YJ Wrangler Technical Forum 7 03-27-2009 06:52 PM
Starting to take longer to start... wwiihistory YJ Wrangler Technical Forum 7 05-02-2006 07:19 PM
Taking longer to start oldNdirty TJ Wrangler Technical Forum 16 08-18-2005 12:18 PM

Posting Rules  
You may post new threads
You may 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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome