Help! 89 Yj bucking and power loss. - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Help! 89 Yj bucking and power loss.

Savvy Billet LED Tail LightsLight up the holidays with LED lights from JeepHutIntroducing MONSTALINER™ UV Permanent DIY Roll On Bed Line

Reply
Unread 03-17-2013, 11:55 PM   #1
duckhunter17
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2012
Location: Long Beach, Mississippi
Posts: 17
Help! 89 Yj bucking and power loss.

Hey guys, got my first jeep bout three months ago ( 1989 yj 2.5l. Manual) and have had little trouble since but about a month ago cranked her up one day and took off and when I accelerated it acted like I wasn't pressing the gas at all, so I pressed it to the floor , still no response let off of it a little and sped up , pressed to speed up again and the jeep bucked forward and made a terrible noise from the engine compartment like a popping noise, any help is appreciated, first time using a forum just need help, also I replaced the fuel injector that I was told could be it but to no avail. Thanks ya'll

duckhunter17 is offline   Reply With Quote Quick reply to this message
Unread 03-18-2013, 08:53 AM   #2
Siva283
Registered User
1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters, WV
Posts: 3,698
You posted this twice. Have you checked your codes yet? Do you know how?
__________________
1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

[QUOTE=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...[/QUOTE]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
Siva283 is offline   Reply With Quote Quick reply to this message
Unread 03-18-2013, 09:49 AM   #3
jokerchief462
Wild Wheeler
 
jokerchief462's Avatar
1989 YJ Wrangler 
 
Join Date: Nov 2010
Location: Sin City, Nevada
Posts: 2,874
I got an 89 and can't get any codesout of mine. Sounds like one of two issues. Fuel starvation or ignition. You need to really check and see how the fuel system is. First a fuel filter change and then you are going to have to check the pulugs cap rotor and wires. While the plugs are out you should do a hot (engine temp normal) compression test. Once assembled start it back up your timing should be at 8 degrees BTDC. Clean up or replace what you don't like and go from there let us know how it progresses. It could just be a a tune-up
__________________
89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

AF Jeep Club Tail #184
jokerchief462 is offline   Reply With Quote Quick reply to this message
Unread 03-18-2013, 09:50 AM   #4
duckhunter17
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2012
Location: Long Beach, Mississippi
Posts: 17
Sorry didnt know I posted it twice , but I didnt kno u could check codes on an 89, is it obd1 ,if so where is it , its really bugging me though thanks
duckhunter17 is offline   Reply With Quote Quick reply to this message
Unread 03-18-2013, 10:05 AM   #5
duckhunter17
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2012
Location: Long Beach, Mississippi
Posts: 17
Thanks joker just changed plugs didnt change wires though guess I should though you think I should do a fuel pressure test for the pump but I am lost on timing so I dont know how to do that thanks
duckhunter17 is offline   Reply With Quote Quick reply to this message
Unread 03-18-2013, 10:25 AM   #6
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,689
Timing is computer controlled. No fault codes on the renix TBI system. Make sure what you are hearing is backfiring and not missing. Backfiring is definitely timing related. Links for the FSM. Download them. If you don't have a meter get one. Backfiring is Distributor (and pickup sensor sold as a unit) or timing chain. You check the chain slack by rotating the crankshaft pulley counter clockwise until the rotor starts to move and then clockwise. You shouldnt see more thean a couple inches of movement.

Here is a link for the FSM. Follow the adjustments on all the sensors.
http://dl.dropbox.com/u/40590346/87-88%20YJ%20Jeep%20Wrangler%20FSM%20manual.pdf
http://dl.dropbox.com/u/40590346/1990%20Jeep%20Factory%20Service%20Manual.pdf
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 03-18-2013, 10:47 AM   #7
duckhunter17
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2012
Location: Long Beach, Mississippi
Posts: 17
Icant tell whether its backfiring or missing but the noise is really loud oriellys told me it could be the tps but ill try what u told me thanks for.the links
duckhunter17 is offline   Reply With Quote Quick reply to this message
Unread 03-18-2013, 12:10 PM   #8
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,689
Loss of power can be a few things. Catalytic coverter blocked would be another good one to check out. Backfiring is very specific that is why I asked.
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 03-18-2013, 12:23 PM   #9
duckhunter17
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2012
Location: Long Beach, Mississippi
Posts: 17
Might have to check cat out then and does anyone know where my tps is on my jeep think I might check it out to pic would be great but not neccesary . Thanks
duckhunter17 is offline   Reply With Quote Quick reply to this message
Unread 03-18-2013, 12:42 PM   #10
jimsahm
Registered User
1989 YJ Wrangler 
 
Join Date: Sep 2010
Location: Navarre, Florida
Posts: 36
Drop your tank and clean it out... I had the EXACT same issue. Mine would idle fine, travel low speeds fine... go to accellerate on the highway and it would start to buck... finally die out (float bowl was empty)... I tried everything... new fuel pump, plugs, wires, etc...

The "sock" at the bottom of the fuel pickup tube was overgrown with crap... Also, for some reason the pickup tube itself was full of what looked like rust particles... It's not a tough job, but certainly the tank must be very close to empty....

Cheers,
Jim
jimsahm is offline   Reply With Quote Quick reply to this message
Unread 03-18-2013, 01:19 PM   #11
duckhunter17
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2012
Location: Long Beach, Mississippi
Posts: 17
Thanks jim plan on doinh some work on it yhis weekend just one more thing im gonna try this weekend thanks ya'll
duckhunter17 is offline   Reply With Quote Quick reply to this message
Unread 03-20-2013, 10:40 AM   #12
duckhunter17
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2012
Location: Long Beach, Mississippi
Posts: 17
Aight guys so yesterday i did some things to see what would help so i changed my plug wires,fuel filter (filthty) , distributer cap and rotor and it seems to have got rid of the bucking problem but still have power loss any suggestions now, but someone told me it could be either the tps or cps no clue?
duckhunter17 is offline   Reply With Quote Quick reply to this message
Unread 03-20-2013, 11:20 AM   #13
schaef89
Registered User
1989 YJ Wrangler 
 
Join Date: Mar 2010
Location: Pittsburgh, PA
Posts: 846
Does it act up when the engine is cold or when the engine is warm? or both?

If it does it when the engine is warm and doesn't do it when the engine is cold, it's most likely a sensor. If it's both then it's probably something that isn't sensor related
__________________
89 YJ S, 2.5L/AX-5/NP231
99 WJ Limited, 4.0L/42RE/NP247
93 YJ, 4.0L HO/32RH/NP231 - Sold
schaef89 is offline   Reply With Quote Quick reply to this message
Unread 03-20-2013, 11:25 AM   #14
duckhunter17
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2012
Location: Long Beach, Mississippi
Posts: 17
Actually runs better cold dont know why but it does
duckhunter17 is offline   Reply With Quote Quick reply to this message
Unread 03-20-2013, 11:27 AM   #15
schaef89
Registered User
1989 YJ Wrangler 
 
Join Date: Mar 2010
Location: Pittsburgh, PA
Posts: 846
Quote:
Originally Posted by duckhunter17 View Post
Actually runs better cold dont know why but it does
Start running sensor checks with a multimeter per the FSM Que gave you.

The list of sensors is: TPS, WOT, ISA motor, O2, CTS, MAT (any other I'm missing from the FSM)

You'll find one is wrong most likely
__________________
89 YJ S, 2.5L/AX-5/NP231
99 WJ Limited, 4.0L/42RE/NP247
93 YJ, 4.0L HO/32RH/NP231 - Sold
schaef89 is offline   Reply With Quote Quick reply to this message
Reply

Tags
bucking , jeep , jerking , YJ

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.