New engine Hesitation - Jeep Wrangler Forum

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

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 08-04-2008, 11:53 PM   #1
06R1Raven01TJ's Avatar
Join Date: Nov 2007
Location: Las Vegas
Posts: 77
New engine Hesitation

Got a question, anyone know what might be causing theese symptoms? I put a new 4cyl engine in my 97TJ, when I first started it up it was fine, now it takes just a bit longer to actually start, then it runs for about 30 second then sounds like it running on three cylinder, you give it gas it goes away an d runs fine after that. It only does it when it hasent been started for a couple hours or in the cold state. The fuel sat for about 6 month without a addidtive, but its been about six month of it running and still does it. Any help would be appreciated.

06R1Raven01TJ is offline   Quote
Old 08-05-2008, 08:39 AM   #2
N5XL's Avatar
Join Date: Jun 2008
Location: Phoenix, AZ
Posts: 24
I could certainly see that a gummed up fuel injector or a leaking fuel injector would cause this problem. You could try to run some fuel injector cleaner through the engine, but if the injector is really bad, you might have to have it professionally cleaned or even replaced. The injectors themselves are fairly cheap so even if you replace all 4 it wouldn't be too bad. Before you go that route though, you should have someone check the fuel system pressure and see if it is specification for bleed down and overall system pressure. I'm also sure you've put new plugs, wires, cap / rotor already right? That's the first thing anyone should do for a general engine performance issue.

N5XL is offline   Quote
Old 08-06-2008, 12:41 PM   #3
Join Date: Mar 2008
Posts: 189
Could also be the idle motor or vacuum leak.

4cyl | 3.5 RE | 35" Trxus | 8.8 | 4:88's
Gilez is offline   Quote

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
rebuilding your engine?? Get Stroked!!! jeeper95yj YJ General Discussion Forum 6 01-01-2014 05:47 PM
D35 strength?? GrnTJ TJ Tech Forum 37 07-31-2013 02:47 PM
Engine Swap 90cheroeke 4.0 Auto Into 94 Wragler 4.0 Manual rich solberg TJ General Discussion Forum 8 06-14-2011 08:56 AM
Couple engine questions jcarlos YJ Tech Forum 3 06-07-2008 04:00 AM
YJ Engine Swap Fuel Question ckonash YJ Tech Forum 3 10-15-2007 08:59 PM

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 11:49 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. is not in any way associated with the Chrysler Motors LLC