FJ60-No Idle-Now Running on 3 cylinders?

[DavidAW]

First, thanks to everyone on Mud. I have found a lot of good info here. Until now I have not had to actually ask for help since most of my issues have already been covered.

85 FJ60, Bought a couple months ago, has been running fine after a few minor fixes.

Recent changes: half way thru tank of gas with SeaFoam added.

She sat for 4 days, when started she would idle rough. Drove fine but stalled at stop lights about half the time.

At rest, it will sometimes idle, but a rev or two will cause it to stall out.

Runs OK at Hi revs.

Been meaning to replace all vac hoses, so I changed them all out, double checked proper connections.
Changed fuel filter
Re-checked timing. OK
Bypassed the fuel cut circuit, (I think) by connecting the green wire to ground.

I read a similar post that mentioned junk in the carb bowl. I had a gasket kit so I pulled the top part of the carb and did find some junk there. It may have been gasket. There was also fine particles, like sand, in the bottom, cleaned it out.

After reassembly, I still have bad idle. But I also have another issue.
It is running rough
It appears that I am only running on cylinders 4, 5, 6.
I can force an idle using the choke. I can pull any of spark plug wires on 1, 2 , 3, with no change in the engine.
I can pull all 3 at the same time with no change.
I verified that I have spark, I can hear the discharge when I pull the wires. I also swapped a plug from 5 to 3.

I assume that 123, are on the same side of the manifold.

Is it possible that I cause this messing with the carb?

Is it possible not to get fuel to the 1st 3 cylinders.
Thanks for the help,
Dave

 

[DavidAW]

Update,

It looks like cylinder 3 is actually running OK.
1 and 2 are still an issue.
I can pull the sparkplug wire from either 1 or 2 (or both) with no change in the engine.
Pull any other wire and the engine slows/dies.

I replaced the plugs. I cant find any wires locally, so I swapped 5 and 6 with 1 and 2, same issue.
I verified that I have spark on 1 and 2.
I dont have a way to check compression, but there is no water or fuel in the oil.

The idle problem comes and goes, ranging from a good 650 RPM to stuttering at ~400, do stalling on decel.

Anyone got a recomendation for the next step?
Perhaps the valves are a problem on 1 and 2.
Maybe the intake, since 1 and 2 share the same port?
Could it all be a carb issue?

Thanks in advance.
Dave

 

[cruiser88]

Maybe a valve adjustment issue?? Strange being three?

And you are sure it is firing?

I forgot..did you run a compression check?

 

[DavidAW]

Thanks Cruiser88,
It's actually 1 and 2 that are missing, 3 turned out OK.
Yes I am getting spark, tested against the valve cover with a spare plug installed.
I have not done a compression test, need the guage.

I saw a couple treads concerning valves. I guess 1 and 2 could need adjustment or be sticking.

Someone suggested adding seafoam directly to the intake, and/or to the crankcase to free up valves.

Anyone have any first hand exp doing this? Would you pour straight thru the carb to get to the intake manifold?

Thanks, Dave

 

[fliphkd778]

If it's sputtering on decel, and it's got spark or timing, it's either an air/fuel issue or compression. I doubt it's a compression issue. The egr valve may be carboned up and not seating fully, leading to there not being enough oxygen. I had a similar problem on mine where it would run at higher rpm's fine, but not lower. It turned out to be that the vacuum control valve for ignition advance was advancing it for high rpm, then keeping it advanced, even when it needed to lower to return to idle. Try disabling the egr by the emissions procedure, and try checking the vacuum control valve for the ignition advance.
Here are some manual excerpts

 

[fliphkd778]

I'll have to get the vcv one up later

 

[sdbrassfield]

Read something in here about 5-6 mos ago about a condition related to the carb that makes it dump fuel into cylinders 1&2. The solution was also posted in a toyota trails mag IIRC...

Anyone remember ?