FJ40 won't idle

[killer1954]

1974 FJ40 F-engine, stock carb. I just replaced the fuel pump and fuel filter. The pump was leaking out of the bottom. The cruiser runs fine except it won't idle. I come to a stop sign and it just dies. Tonight I will re-check the idle mixture. Other than that, I haven't made any changes in adjustment. Any ideas? Mechanical skills are nominal but always willing to learn.

 

[killer1954]

I should add that it has been de-smogged.

 

[3_puppies]

will it run with the choke pulled out abit? if so probably a vacumn leak

 

[killer1954]

choke out

yes, in fact, it does run with the choke pulled out a bit. where might I check for this possible leak?

 

[desertdude]

intake manifold, anywhere you had smog vacuum lines to the carb. Loose carb? A Vac pressure tester could help you out here.

 

[65swb45]

The timing of your changes and your problem suggest to me the possibility that in changing the fuel pump, you jogged some shellac loose from inside the lines that made its way into the idle circuit of the carb. As a carb rebuilder, I've seen it happen before!

Mark

www.marksoffroad.net

 

[killer1954]

won't idle

Well, upon further inspection, I found that the idle solenoid does, in fact, click on turning the key, and that the hose from the PCV valve was not tightened down. I took it for a test drive and all was well for a couple of miles, engine kept running at stoplights, etc. Then, just as I felt satisfied I had resolved my problem, it reoccurred. Wouldn't idle at stoplights. So the problem is intermittent. I have yet to look into the carb. I bought a vacuum gauge last night, so I will check my vacuum pressure tomorrow.

 

[killer1954]

now it idles

Well, I guess it must have been some crud in the fuel somewhere, as the problem has left as mysteriously as it arrived. Spent a good week with the problem. No apparently it's gone. Thanks to all for their insightful suggestions.