85 fj60 rough idle help

[another line]

Recently (1 moth ago) I tuned up ( spark plugs, wires, distributor cap, etc...) my rig and it was running great. In the last few days it will barely run at idle and seems to be missing. With a little acceleration it runs fine. It also does not want to run on full choke after it has started for more than a few seconds. I have not replaced the fuel filter in about 6 months. Does this sound like it could be a fuel related problem? I am going to replace the filter this afternoon to eliminate that. Doe anyone have any other thoughts or ideas?

Thanks

 

[Cody Canada]

I would do the filter, if it doesn't help, you might have a dead spot in the carb.

 

[theRash]

Alway start by checking the easy stuff first... I'd say check your vaccum hoses for leaks or disconnection first but since you just recently did a tune up. Check the firing order of the plug wires, then move to vaccum lines. Go back over things you've touch first. Is your timing off slightly? I'd change the fuel filter anyways as part of the tune up but I wouldn't expect that to fix your issue. Also, don't forget to do a search on rough idle as well.

 

[another line]

I would do the filter, if it doesn't help, you might have a dead spot in the carb.

Could you explain a dead spot in the Carb?

thanks

 

[DavidAW]

Junk in the Carb?

I had a similar issue. I did all the Fuel Filter/PCV, vac stuff, etc.

What finally got it to idle was pulling the carb and cleaning it based on some tips I found here on mud.

I had a Gasket for the air horn(top part of the carb) from a rebuild kit the PO left me.
This was the only part I needed since it was destroyed while removing the air horn.
This was not a rebuild.

Heres the steps I did.
Remove Carb- pretty easy
Remove air-horn-careful of float, dont damage it.
Removed each of the jets from bottom part of the carb (3 I think) and clean with carb cleaner and canned air. These just screwed out, look like plastic screws.
Removed and cleaned 1 jet from airhorn.
All jets had a free flow to somewhere, where the cleaner would come out.
Remove the idle mix screw and clean same way, with throttle open.
Cleaned the bowl, and the ports that lead into it.

Remove the float/pin and remove the round cylinder that the pin goes in(need a big screw driver. There was a screen in there that was a bit dirty.

Generally cleaned every surface in the carb I could get to.

Reassembled and re-installed
**The idle mix screw goes back in til it stops hen back out 3 turns. it really should get an adjustment
** You may need to adjust the Float, I did not.

So far the idle has been good. Knock on wood.

Also be sure the 4 carb studs are in good shape. I replaced mine because one started to strip. Got them at AutoZone.

HTH

 

[DavidAW]

I had a similar issue. I did all the Fuel
HTH

Heres a couple pics if they help

There are 2 holes on the front that give access to the jets.

 

[Cody Canada]

Could you explain a dead spot in the Carb?

thanks

Some old carbs get a "dead spot" at some point in the throttle. What I mean by that is that the engine runs poorly at a specific point in the range of the accelerator.

 

[michael.e]

Some old carbs get a "dead spot" at some point in the throttle. What I mean by that is that the engine runs poorly at a specific point in the range of the accelerator.

Mine is doing that at the low end of the powerband. I give it a bit of gas and it has this little stutter....

Also tried to smog it and it was running rich, did not pass..

emee