Fuel injection with different pulse widths - JKowners.com : Jeep Wrangler JK Forum
LinkBack Thread Tools Display Modes
post #1 of 5 Old 08-15-2017, 09:36 AM Thread Starter
Join Date: Mar 2015
Posts: 2
Feedback: 0 reviews
Fuel injection with different pulse widths

On cylinders 1,3,5 it's at 3200 to 3700 on cylinders 2,4,6 it's up to 4000 to 4200. Is this enough to cause p0300 multi misfire? When i hit the gas while in gear my jk falls flat on its face.
Thanks for any help.
bassment03 is offline  
Sponsored Links
post #2 of 5 Old 08-15-2017, 06:17 PM
Rock God
Guruman's Avatar
Join Date: Feb 2010
Location: Thompson Falls, Montana
Age: 48
Posts: 1,163
Feedback: 0 reviews

My best guess is that the modified PW is a symptom of the misfire, not a cause.

Others might be able to chime in, but when looking for misfires, I think... plugs/coils/carbon deposits/fuel quality/knock sensor... etc...

'76 CJ-7, '43 CJ-2a, '78 Bronco,'78 CJ-7, '75 CJ-5, '78 CJ-7, '80 CJ-7, '78 SJ, '79 SJ, '78 and a '76 FJ-40 , '90 XJ, '91 XJ, '86 CJ-7, '95 ZJ, '68 CJ-101 Commando, '00 TJ, '68 M-715, 2 '86 Military Blazers, '96 LR Discovery, '86 CJ-7, '91 YJ, '99 TJ, 07' JKU Rubi, 1988 YJ, 1973 Commando, 3 Diesel Excursions....
Now back to a 2013 JKU Rubicon with "stuff", planning 37's with minimal lift.

I've tried them all... Jeeps are still the best. (0||||0)
Guruman is offline  
post #3 of 5 Old 08-16-2017, 05:35 AM
Super Moderator
j3ff3ry_j33p's Avatar
Join Date: Jul 2012
Location: Nashville
Posts: 5,804
Feedback: 1 reviews

hear any popping ( electric-like) or crackles underchood or , in complete darkness visual blue arcing under hood around plug wires?
Most replaced item - before I started running heat shielding ,plug boots (& stopped using an antiquated , wire eating set of cheap plug boot pliers that also cut tiny holes in the grey boots ) -on my '11 unlimited was the spark plug wiring . Yours being a multi makes me suspect the wiring and the ignition pack itself .
Plugs can get wider and wider gapping from heat and age, too.
Like mentioned , cleaning top end helps but this sounds like the coilpack may have gotten heat damaged? Just throwing options out for ya

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
j3ff3ry_j33p is offline  
Sponsored Links
post #4 of 5 Old 08-16-2017, 05:55 AM
Rock God
coilrod's Avatar
Join Date: Feb 2010
Location: Lower mainland
Age: 52
Posts: 1,617
Feedback: 0 reviews

Have you left it parked for any extended times? I spent about 6 months away working, then a couple more. I filled ip about 2 times in 2 years. I killed my battery and started getting massive powerloss and misfires. Had the tank drained and all was good again.

Originally Posted by thedirtman View Post
Running 37's as a daily driver is dumb
coilrod is offline  
post #5 of 5 Old 08-26-2017, 08:56 PM
Join Date: Nov 2015
Location: colorado
Posts: 15
Feedback: 0 reviews

also if you have recently fueled up make sure you didnt get bad fuel and have a water in the fuel issue.
if you fuel while the tanker is depositing fuel or right after you can get a lot of crap in the system.
ktwillys is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the JKowners.com : Jeep Wrangler JK 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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

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 On
Pingbacks are On
Refbacks are On

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