Off-Road Forums & Discussion Groups

Off-Road Forums & Discussion Groups (
-   Jeep-Short Wheelbase (
-   -   Engine problems- please help (

Sycho15 09-25-2000 12:21 PM

Engine problems- please help
This was posted on the Full-Size Jeep forum, to reply to the post, click here

I have a Jeep that doesn't run right. Mine is a 76 J10/258 (L6). Symptoms: Won't idle, only runs at high RPM. Starts
ok and runs smoothly until full choke comes off Then it tanks unless I keep my foot in it to keep the throttle open.
Seems smooth, but as soon as engine speed starts to drop it's like someone turned it off, unless I pump the gas and
get the engine speed back up. Seems like it's not running on the idle circuit, only main jets, except when fully choked.

Here's what I've done so far:
- replaced the distributor (old was HEI conversion that was worn out, new is Motorcraft for '78 engine) cap, rotor,
coil & ignition module. I was going to do this anyway, so it's not really a case of throwing parts at it.
- Checked timing.
- disassembled carb (rebuilt last fall) and cleared idle jet passages etc with compressed air, checked idle jets and tubes for clogging - they were clear. I have done the tube bore-out recommended in the FAQ. Did not check float level but did verify that the valve works.
- checked fuel flow both before and after fuel filter.
- disassembled the EGR valve assembly. It does not work at all, due to leaky diaphram. But the valve itself is closed
and this is not recirculating any exhaust gas. I don't think it has worked since I got the engine, and I have not had it
- capped all vacuum ports from the carb to make sure there were no vacuum leaks in the tubing.
- When I pulled a plug (#1, to verify TDC when replacing the dizzy) I observed that it was very clean, looked new. It
is new, has less than 2000 miles on plugs & about 4000 on wires.

Where do I go from here?

Restoring a '74 DJ-5C [img]/wwwthreads_images/icons/cool.gif[/img] Its missing the alternator. At first the Ammeter guage just didn't work but now its missing an alternator [img]/wwwthreads_images/icons/crazy.gif[/img]

**DONOTDELETE** 09-25-2000 04:08 PM

Re: Engine problems- please help
Be sure to check you float levels, I have had this problem with Holley Carbs. It seems that the float tang get bent during hard off-roading. You can also tell by looking down the carb when it idle's, you will see lots of gas laying around and thats what kills you engine.

John S.

sas87yj 09-25-2000 06:01 PM

Re: Engine problems- please help
might think about getting a new rebuilt carb![img]/wwwthreads_images/icons/smile.gif[/img]

do you have a carter?

All times are GMT -5. The time now is 12:35 AM.

Powered by vBulletin® Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.

User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright 1994-2009, VerticalScope Inc. // Off Road forums & discussion groups sitemap
side by side | atv | dirtbike | snowmobile | sandsport | competition | land use | Jeep | Toyota | Ford | GM

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