Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

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

Join Wrangler Forum Today


Thread: Engine Pulsing Reply to Thread
Title:
  
Message:
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

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.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
08-02-2013 06:37 PM
apannone Ok, sorry for the delay. Here's a link to the video/sound clip I was able to get. You'll need headphones to catch the pulsing I'm referring to.

Jeep Pulsing

Sorry if the video ends up sucking. Please let me know if you guys notice what I'm talking about or if I'm going crazy. lol
07-31-2013 10:55 AM
bustedknuckles Kindof sounds like what mines doing. Just at idle. Small hicup. But give it any gas it's smooth as can be. Mines an auto tho. Not that it matters.
07-31-2013 10:47 AM
apannone I'll try to upload a video or sound clip later.
07-31-2013 10:01 AM
1979WagoneerLTD Idle hunting is when the engine cannot maintain a stable idle, as if it were "hunting" for the correct.

Can you take a video and youtube since armchair diagnostics are like shotgun blasts.
07-31-2013 09:50 AM
apannone I'm not sure what you mean by idle hunting.
07-31-2013 09:37 AM
1979WagoneerLTD
Quote:
Originally Posted by apannone View Post
Hey Everyone,

Lately I've been noticing my 4.0L is pulsing slightly at idle. Along with this it has a slight hesitation when first shifting into gear. Other than that it runs pretty good. Here's what I've done to the jeep so far:

New Plugs
New Plug Boots
Cleaned TB
Cleaned IAC
New Cat-back Dynomax Exhaust
New Air Filter
New Fuel Pump

I don't have a CEL on, so I'm just wonder if there's any way to determine why it's pulsing. It also just passed CT emissions for what it's worth. I'm thinking an injector issue or possibly the coil pack gone bad, but I'm open to other suggestions. Maybe it's nothing? Thanks in advance for the input!
Is it like "idle hunting"?
07-31-2013 09:31 AM
apannone Sure did.
07-31-2013 08:50 AM
Robertsk1 It doesn't sound like a hung up pulley though. My first guess would be the IAC, but you said you cleaned that. Did you pull back the sleeve and clean it with carb cleaner when you did it?
07-31-2013 08:42 AM
apannone The pulsing is only noticed while idling at a stand still. If I hold the rpms at 1500 there's no pulse. There's also no pulse while driving. I'll have to take the belt off this weekend and check that all the pulleys are spinning free.
07-31-2013 07:37 AM
Robertsk1 You'd have much worse problems if your alternator was bad. To rule out your idler pulley, loosen up the tension on your serpentine belt and wiggle around the pulleys it runs on. All the wheels should spin freely without hanging up anywhere. Could just be a bad bearing in one of them. Does this pulsing go away, speed up, etc.. when you rev the engine while not moving?
07-31-2013 07:19 AM
apannone Both. I can see the tach moving up and down, albeit a small movement. But the tach movement coincides with the pulsing sound I hear. Could it be a bad idler pulley or alternator?
07-31-2013 07:02 AM
Robertsk1 When you say pulsing, do you mean the rpm's jump up and down? Or is just a sound that the motor makes?
07-31-2013 06:24 AM
apannone
Engine Pulsing

Hey Everyone,

Lately I've been noticing my 4.0L is pulsing slightly at idle. Along with this it has a slight hesitation when first shifting into gear. Other than that it runs pretty good. Here's what I've done to the jeep so far:

New Plugs
New Plug Boots
Cleaned TB
Cleaned IAC
New Cat-back Dynomax Exhaust
New Air Filter
New Fuel Pump

I don't have a CEL on, so I'm just wonder if there's any way to determine why it's pulsing. It also just passed CT emissions for what it's worth. I'm thinking an injector issue or possibly the coil pack gone bad, but I'm open to other suggestions. Maybe it's nothing? Thanks in advance for the input!

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


All times are GMT -5. The time now is 12:39 PM.



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