I HATE MY 258!!! - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 10-16-2000, 06:37 PM
**DONOTDELETE**
Guest
 
Posts: n/a
I HATE MY 258!!!

What is wrong with my engine. I just had the 258 rebuilt. All emissions were stripped, and a REBUILT carb was put on without the stepper motor. The engine will not idle any more, especially when it is cold. I wish I could just fire it up and let it run without holding the gas pedal to make it warm up. Any advice?

1987 YJ Laredo/3" Body/30X9.5" All Terrains/Rebuilt 258/BA 10/5
Rylan D.
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 10-16-2000, 07:30 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: I HATE MY 258!!!

I feel your pain - really, because my 258 does the same thing, just not as bad. I rebuilt my Carter Carb myself, and it runs a bit smoother. If you rebuilt the engine yourself, did you put all the vacuum hoses on right?
What I can't figure out on mine is if it's getting too much fuel (flooding), or not enough (starving). I put in a new fuel pump and filter, which I assume you did as well, and no change...

Jedidiah Smith
1980 Jeep CJ-7 I-6, 258 stock for now
post #3 of (permalink) Old 10-16-2000, 07:45 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: I HATE MY 258!!!

Before I killed my 258 which had the Carter carb... I put in a manual choke and was able to deal with the idle problems that way. Good Luck.

Sponsored Links
Advertisement
 
post #4 of (permalink) Old 10-16-2000, 07:46 PM
Keyboard Implanted
 
pontiac58's Avatar
 
Join Date: Jul 2000
Location: southern new jersey
Posts: 2,818
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: I HATE MY 258!!!

Did you but your heat tube on that warms up with the exhaust so the carb get warm air at first start up. Is the choke working. My brother in law had the same problem until i relized it didnt have that flexible air heat tube (or what ever they call it)>

pontiac58 is offline  
post #5 of (permalink) Old 10-16-2000, 08:06 PM
JMZ
Journeyman
 
JMZ's Avatar
 
Join Date: Feb 2002
Location: gonzales,TX
Posts: 189
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: I HATE MY 258!!!

Sounds like a vacuum problem.

82 cj-7,258,hei,weber,np435,D-300, superior axles
JMZ is offline  
post #6 of (permalink) Old 10-16-2000, 08:42 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: I HATE MY 258!!!

Rylan, your 258 is an inanimate object, it can't choose, by it's own free will, to run or not run.
Direct your anger towards the source of the problem, the "so called" mechanics who work on your engine.
I currently maintain 7 258's for myself and family members and have zero problems!
An engine can't choose to run good for me and not run good for you.
When all its systems are functioning properly an engine has to run good, it doesn't have a choice,
fuel, compression, and ignition causes an explosion in a confined place with only 1 place to go, it moves the piston.
Assuming all else is good, the fuel system is the usual culprit for the symptoms you describe.
Here's what I do , rebuild the carb, disable the stepper motor, check the choke pulloff for vacuum leaks, eliminate all vacuum related emmission controls, the only vacuum lines going to the carb are the dist. advance,the PVC, and the EGR is optional. Check the vacuum advance for leaks and tighten the intake manifold, the rear bolts always loosen on me. Make sure the choke is working right. In other words eliminate ALL vacuum leaks.
If your fuel system is clean, freshly rebuilt properly with no vacuum leaks it has to work right , it does not have a choice.

CTjeepnut

Funny thing is, the more I practice, the luckier I get
post #7 of (permalink) Old 10-16-2000, 08:48 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: I HATE MY 258!!!

check this out:http://www.jeeptech.com/engine/carter.html

[img]/wwwthreads_images/icons/cool.gif[/img]http://members.home.net/paul5696[img]/wwwthreads_images/icons/cool.gif[/img]
Paul's Datsun Project
79 Datsun p/u 620
post #8 of (permalink) Old 10-16-2000, 10:13 PM
 
Join Date: Nov 1999
Posts: 553
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: I HATE MY 258!!!

Rylan, all I have to say is to check ALL of the vacuum lines and make sure there are no leaks.
Replace them if you have to.
If none of this works for you and you are looking for a fairly easy fix for your problem I would look into the manual chokes.
I know it might look kind of odd on your jeep, but if it makes it work properly then I would go for it.
On my Willys I just start it, set the choke at a given position, let it run for a few minutes and then get off to wherever I need to go.

One thing I did to the Willys is I disabled the motor driven fuel pump and I put on an electric fuel pump.
This will always keep between 2 P.S.I. and 4P.S.I of fuel waiting to be used at your earliest convienience.
This last weekend I climbed a hill that is very rocky with a few ledges.
With the normal fuel pump it would stall when the motor started idling slow because the fuel pump was not going fast enough for it.
With the electric fuel pump it just idled right on up the hill like it was no sweat off its back.
Anyway, I hope this helps you out.
Take care and happy jeepin'.

"I see." the blind man said to the deaf woman.[img]/wwwthreads_images/icons/wink.gif[/img]
redbeard is offline  
post #9 of (permalink) Old 10-16-2000, 10:26 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: I HATE MY 258!!!

Is your Emissions Canister Hooked UP?.. Everyone tells me without this central control the engine will never run perfectly? Somehow its like a central vacuum port. Maybe if you hooked all the emission crap up and ran new vacuum lines you would see a big difference?

<font color=blue> Muddynut</font color=blue>
<font color=red>[img]/wwwthreads_images/icons/cool.gif[/img]'79 CJ7 "Issues"-304-35s</font color=red>[img]/wwwthreads_images/icons/cool.gif[/img]
post #10 of (permalink) Old 10-17-2000, 11:27 AM
I Might Just Know What I'm Talking About
 
Pete88YJ's Avatar
 
Join Date: Sep 1999
Location: BOSTON
Posts: 1,748
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: I HATE MY 258!!!

There's not much left, if you've done all that.

1) Make sure the choke is closing when it's cold, and opening when it warms up.

2) Do the typical tests to see if the throttle shaft bushings are bad on your "rebuilt" carb - a lot of cheesy rebuild shops won't replace them.

3) I installed a permanent vacuum gage under the hood of my Jeep - it's probably the most important tool for an inline 6 that's prone to vacuum leaks. You should have a steady 16-22 in Hg. (mine's about 20) at idle.

4) How new is your fuel pump? It could be not supplying enough fuel.

5) Fuel filter in good shape?

6) What is your ignition situation? Did you do the "take the computer out of the loop" thing when you put on the non-stepper carb?

Bottom line - I still say that any half-complete system will not run well. When I put the weber carb on my 258, I left as many emissions things connected on my Jeep that I could, and it ran pretty well - way better than that BBD ever did. Then I did the nutter, because the computer was still varying the timing a little, and [email protected] the whole system, and it ran like crap. Then I put in the HEI and haven't looked back since. Weber, GM HEI, EGR, PCV, and it's great. [img]/wwwthreads_images/icons/smile.gif[/img]

Good luck, the 258 is a nice motor, but a half-together system will never run well, in my opinion.
Pete

88YJ, 4"susp, JKS 1.25" body lift, 33"BFGMT, 9000# winch, homemade rear tire carrier, reb. 258, 999 auto, 4.10 axles, weber 32/36 carb w/adj. reg., GMHEI, CJ dash, ...and one moonguy[img]/wwwthreads_images/icons/cool.gif[/img]
Pete88YJ is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups 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 email address for yourself.

Email Address:
OR

Log-in










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



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 On
Pingbacks are On
Refbacks are On

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