Couple of questions for folks. Hopefully somebody can help.
My truck (1986 FJ60) all of a sudden won't idle. It was running fine, then I drove it about 50 miles and stopped for groceries (going camping). When I started up again, it wouldn't idle or if it does idle its VERY rough. Off idle it runs good and pulls strong, although sometimes a small amount of surging/hesitation.
I've checked the float level, fusible link, and vacuum modulator. Also replaced the air cleaner, put some Seafoam through the gas tank, and sprayed down the carb with cleaner. No dice.
I found a broken wire on the idle solenoid, fixed that and verified the solenoid clicks, but it made no difference. Also, if I unplug the fixed idle solenoid, there's no change in behavior - it still dies.
Then I found the VTV valve connected to the carb was plugged, so I replaced that. No difference. If I take out the VTV and plug the lines I can get the truck to idle OK around 1,000 RPM but there's a slight misfire coming from the exhaust. That doesn't mean anything to me, but maybe it's a clue for one of you guys.
I know there are numerous posts about rough idle and hesitation. I've read them all and they're helpful, but none are the same problem that I'm dealing with.
Any and all ideas about what might be causing this would be SUPER helpful. Anyone?
I just bought a vacuum gauge and some hose, and am starting to go through the emissions manual. One thing that I don't understand is in the upper right corner of the diagram below(circled in red). What and where are those connections? I don't see anything that looks like that under the hood.
Thanks in advance for the advice and help!
My truck (1986 FJ60) all of a sudden won't idle. It was running fine, then I drove it about 50 miles and stopped for groceries (going camping). When I started up again, it wouldn't idle or if it does idle its VERY rough. Off idle it runs good and pulls strong, although sometimes a small amount of surging/hesitation.
I've checked the float level, fusible link, and vacuum modulator. Also replaced the air cleaner, put some Seafoam through the gas tank, and sprayed down the carb with cleaner. No dice.
I found a broken wire on the idle solenoid, fixed that and verified the solenoid clicks, but it made no difference. Also, if I unplug the fixed idle solenoid, there's no change in behavior - it still dies.
Then I found the VTV valve connected to the carb was plugged, so I replaced that. No difference. If I take out the VTV and plug the lines I can get the truck to idle OK around 1,000 RPM but there's a slight misfire coming from the exhaust. That doesn't mean anything to me, but maybe it's a clue for one of you guys.
I know there are numerous posts about rough idle and hesitation. I've read them all and they're helpful, but none are the same problem that I'm dealing with.
Any and all ideas about what might be causing this would be SUPER helpful. Anyone?
I just bought a vacuum gauge and some hose, and am starting to go through the emissions manual. One thing that I don't understand is in the upper right corner of the diagram below(circled in red). What and where are those connections? I don't see anything that looks like that under the hood.
Thanks in advance for the advice and help!