Bosch fuel injectors - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 11-11-2015, 09:53 PM
Thread Starter
  #1
Jeeper
 
Stevenmuck's Avatar
 
Join Date: Sep 2015
Posts: 83
Bosch fuel injectors

Just upgraded my stock injectors to the 4 hole fuel injectors. The vehicle takes longer to turn over now. Some times it take a few turns of the key to get it started. I dont know what the issue is but once the Jeep is started it drives exceptionally. This wasnt happening with the old fuel injectors though.

Stevenmuck is offline   Quote
Old 11-12-2015, 07:28 AM   #2
Jeeper
 
jape's Avatar
 
Join Date: May 2014
Location: Morgantown, WV
Posts: 329
are your injectors too large of a lb rating? What engine/which injectors? The jeeps start in closed loop until they are warmed up, meaning they aren't reading O2 sensors for rich/lean just a default air/fuel mixture. If your injectors are too large and aren't allowing enough flow until pressure builds it could be why. Have you tried priming the fuel pump (turning the vehicle on and not starting) a couple times first? Also may want to check your fuel pressure at the rail. Wrangler fuel pumps/fuel pressure regulators are known to go and could be a culprit if you find fuel pressure at the rail is too low.

__________________
/l ,[____],
l---L -OlllllllO-
()_)-()_)-o-)_) 2001 Wrangler, 2.5L, 5-speed, 33"x 10.50 BFG KO2, 4" Mixed Lift, 4.88 Gears, Bilstein 5100's.
jape is offline   Quote
Old 11-12-2015, 08:43 AM   #3
Jeeper
 
Join Date: Oct 2011
Posts: 3,958
Quote:
Originally Posted by jape View Post
The jeeps start in closed loop until they are warmed up, meaning they aren't reading O2 sensors for rich/lean just a default air/fuel mixture.
Open loop.
tangofox007 is online now   Quote
Sponsored Links
Advertisement
 
Old 11-12-2015, 09:01 AM
Thread Starter
  #4
Jeeper
 
Stevenmuck's Avatar
 
Join Date: Sep 2015
Posts: 83
I started her up this morning. I did turn the key a few times and it started up normal. I ordered the injectors my my year model so if theyre too big, I was misinformed. I set the old ones and new ones side by side, pretty much an exact match.
Stevenmuck is offline   Quote
Old 11-12-2015, 09:08 AM
Thread Starter
  #5
Jeeper
 
Stevenmuck's Avatar
 
Join Date: Sep 2015
Posts: 83
And I dont have the part number now. What I know is that theyre Bosch 4 hole nossle for 99-04 4.0 I6
Stevenmuck is offline   Quote
Old 11-12-2015, 09:10 AM   #6
Jeeper
 
jape's Avatar
 
Join Date: May 2014
Location: Morgantown, WV
Posts: 329
what website did you order them from? And if you primed the pump first it could be your fuel pressure regulator. Tangofox007: I wasn't 100% on open or closed loop. I though open loop was when it started reading the O2 and making adjustments, hence the loop is open adjusting for data input as opposed to closed using pre-set mixture. Guess i thought wrong, been a while since college and forgot the closed/open loop material
__________________
/l ,[____],
l---L -OlllllllO-
()_)-()_)-o-)_) 2001 Wrangler, 2.5L, 5-speed, 33"x 10.50 BFG KO2, 4" Mixed Lift, 4.88 Gears, Bilstein 5100's.
jape is offline   Quote
Old 11-12-2015, 11:36 AM
Thread Starter
  #7
Jeeper
 
Stevenmuck's Avatar
 
Join Date: Sep 2015
Posts: 83
Precisionautoinjectors.com
Stevenmuck is offline   Quote
Old 11-12-2015, 11:42 AM
Thread Starter
  #8
Jeeper
 
Stevenmuck's Avatar
 
Join Date: Sep 2015
Posts: 83
But the only thing is... It hasnt ever done this before. I changed the injectors and boom the Jeep takes a couple times to start up now.
Stevenmuck is offline   Quote
Old 11-12-2015, 01:32 PM   #9
Jeeper
 
Join Date: Apr 2013
Posts: 12,979
Multiple prime runs helping it start most likely either injector leak or bad check valve in fuel pump assembly

Typically check valve but given recent injector swap suspect leaky injector

Course temporal association only suggests causation

Just pull rail with injectors attached and observe for drips off tip after turning key to on

Careful donT start a fire but a leak will be easy to detect
Digger84 is offline   Quote
Old 12-24-2015, 12:19 PM
Thread Starter
  #10
Jeeper
 
Stevenmuck's Avatar
 
Join Date: Sep 2015
Posts: 83
Sorry, its been a while.
The culprit was a leaky injector from the old O ring being stuck. So there were essentially 2
O rings that compromised the injector.

Stevenmuck is offline   Quote
Reply

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






All times are GMT -5. The time now is 03:53 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC.
Wranglerforum.com is not in any way associated with FCA US LLC.