backfire thru the intake - Jeep Cherokee Forum
Jeep Cherokee Forum


backfire thru the intake

Reply
 
 
 
Thread Tools Search this Thread
Old 06-24-2009, 05:17 PM   #1
CF Veteran
Thread Starter
 
claygrassmann's Avatar
 
Join Date: Dec 2008
Location: eaton ohio
Posts: 1,533

View claygrassmann's Photo Album My Photos
Default backfire thru the intake

just like the title says, any idea what it could be or what it usually is when it does this
claygrassmann is offline   Reply With Quote
Old 06-24-2009, 06:52 PM   #2
CF Veteran
 
98 JeepJeep's Avatar
 
Join Date: Oct 2008
Location: Stafford,VA
Posts: 2,543

View 98 JeepJeep's Photo Album My Photos
Default

back-firing thru the intake is normally a sign of timing out of wack.......
98 JeepJeep is offline   Reply With Quote
Old 06-24-2009, 07:03 PM   #3
CF Veteran
Thread Starter
 
claygrassmann's Avatar
 
Join Date: Dec 2008
Location: eaton ohio
Posts: 1,533

View claygrassmann's Photo Album My Photos
Default

but you cant time the 4.0 can you? the cps controls all that right?
claygrassmann is offline   Reply With Quote
Old 06-24-2009, 07:10 PM   #4
CF Veteran
 
98 JeepJeep's Avatar
 
Join Date: Oct 2008
Location: Stafford,VA
Posts: 2,543

View 98 JeepJeep's Photo Album My Photos
Default

I have seen the Distributor gears wear thin causing pops and misses.

Last edited by 98 JeepJeep; 06-24-2009 at 07:17 PM.
98 JeepJeep is offline   Reply With Quote
Old 06-24-2009, 07:15 PM   #5
CF Veteran
Thread Starter
 
claygrassmann's Avatar
 
Join Date: Dec 2008
Location: eaton ohio
Posts: 1,533

View claygrassmann's Photo Album My Photos
Default

and how do i go about adjusting that and checking the gears?
claygrassmann is offline   Reply With Quote
Old 06-24-2009, 07:24 PM   #6
CF Veteran
 
98 JeepJeep's Avatar
 
Join Date: Oct 2008
Location: Stafford,VA
Posts: 2,543

View 98 JeepJeep's Photo Album My Photos
Default

Quote:
Originally Posted by claygrassmann View Post
and how do i go about adjusting that and checking the gears?
Ign timing for the 4.0 is none adjustable.....
Here is what i normally do for a condition like yours

1. check plugs/wires/cap/rotor.
2.Check fuel pressure.
3.for removal of the Dist(if you decide to pull it) you need to mark the base of dist and the block so it goes in exactly like it came out...then next mark the rotor point to the side of the dist. to insure it is pointing in the right spot. remove dist hold down/wires then pull it out....
98 JeepJeep is offline   Reply With Quote
Old 06-24-2009, 07:27 PM   #7
CF Veteran
Thread Starter
 
claygrassmann's Avatar
 
Join Date: Dec 2008
Location: eaton ohio
Posts: 1,533

View claygrassmann's Photo Album My Photos
Default

that sounds easy enough and i got a buddy that went to UTI so i think if i eff it up he could fix it. distributers are cheap enough i might just go ahead and do that, what should my fuel psi be at? what do i need to check that?
claygrassmann is offline   Reply With Quote
Old 06-24-2009, 07:36 PM   #8
CF Veteran
 
98 JeepJeep's Avatar
 
Join Date: Oct 2008
Location: Stafford,VA
Posts: 2,543

View 98 JeepJeep's Photo Album My Photos
Default

Being that you have a 95 and earlier you should have a schrader valve on your fuel rail....kinda looks like a big valve stem....should have a cap on it. that is where your gonna hook up a fuel pressure guage(0-60psi). and since you have a vacuum asst regulator you should see 31 with line on and 39psi with it off.
98 JeepJeep is offline   Reply With Quote
Old 06-24-2009, 07:39 PM   #9
CF Veteran
Thread Starter
 
claygrassmann's Avatar
 
Join Date: Dec 2008
Location: eaton ohio
Posts: 1,533

View claygrassmann's Photo Album My Photos
Default

dude are you a mechanic? or just know that much about jeeps lol

would this work?

http://www.sears.com/shc/s/p_10153_1...0070921x00003a

Last edited by claygrassmann; 06-24-2009 at 07:41 PM.
claygrassmann is offline   Reply With Quote
Old 06-24-2009, 07:42 PM   #10
CF Veteran
 
98 JeepJeep's Avatar
 
Join Date: Oct 2008
Location: Stafford,VA
Posts: 2,543

View 98 JeepJeep's Photo Album My Photos
Default

Quote:
Originally Posted by claygrassmann View Post
dude are you a mechanic? or just know that much about jeeps lol
I am a diesel mechanic during the day....work on the mustang and jeep as a hobby. when im not fixing everyone elses cars around the neighborhood.......
98 JeepJeep is offline   Reply With Quote
Old 06-24-2009, 07:43 PM   #11
CF Veteran
 
98 JeepJeep's Avatar
 
Join Date: Oct 2008
Location: Stafford,VA
Posts: 2,543

View 98 JeepJeep's Photo Album My Photos
Default

Quote:
Originally Posted by claygrassmann View Post
thats the one i have....it will work on any fuel pressure system that uses a schrader valve......
98 JeepJeep is offline   Reply With Quote
Old 06-24-2009, 07:45 PM   #12
CF Veteran
Thread Starter
 
claygrassmann's Avatar
 
Join Date: Dec 2008
Location: eaton ohio
Posts: 1,533

View claygrassmann's Photo Album My Photos
Default

score thanks for the help man i really appreciate it
claygrassmann is offline   Reply With Quote
Old 06-24-2009, 10:56 PM   #13
CF Veteran
 
tampaviking's Avatar
 
Join Date: Sep 2008
Location: Ft. Lewis, Wa
Posts: 1,053

View tampaviking's Photo Album My Photos
Default

tampaviking is offline   Reply With Quote
Old 07-14-2009, 11:51 PM   #14
Newbie
 
Join Date: Jul 2009
Posts: 10

View Westy661's Photo Album My Photos
Default

I am having the same issue as this. What ended up being the resolve to your issue?

I have new plugs, wires, dist cap, rotor.... Missing/Backfiring under heavy accel and around 1800 rpm.
Westy661 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Skyhunter Paco182 Jeep Builds 14 12-27-2016 06:52 PM
Where did the Cowl Intakes go? Sethers775 Modified Cherokee Tech 36 03-09-2016 11:06 AM
Southeast Pa. here 99xjBill Introductions 6 10-08-2015 09:59 AM
ARB onboard air mounting xjcherokee2000 Modified Cherokee Tech 4 09-29-2015 08:28 PM
2001 jeep cherokee mods DirtyKurty Cherokee Chat 3 09-29-2015 01:46 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 03:20 PM.