Question: I am having some trouble with my 78 fj-40. I've only had it for a few weeks and haven't had a chance to drive it much so keep that in mind. It dies out if the choke is pushed in all the way, but runs fine at the half/starts fine at the full out. Is this a symptom of a serious problem or do I need to adjust the carb or idle speed or something. Also, after running for a while (warming up) it loses power when I push the gas and it sputters. I have to pull out the choke more than half way (already at half) to get it smoothed out. Its like its running out of fuel or something. Any thoughts appreciated. Allen Answer: You may have a vacuum leak. Look to see if a vacuum hose fell off somewhere. Other causes of vacuum leaks include carb mounting bolts backing out or manifold not torqued down... Jeff Zepp Answer: Jeff Zepp is correct... I'll bet you it is a vacuum leak. You are describing a classic case of vacuum leak. A vacuum leak causes your carb to see a lean mixture because it is getting too much air (through mixture adjustment AND vacuum leak). Therefore your motor only wants to run if you choke it which is, in fact, making the mixture more rich by restricting air. They are sometimes hard to find but I'll guarantee you have one. BIG Answer: My '78 started doing that one day after I was playing in the water. My voltage regulator was acting screwy, and I had a blown "engine" fuse. I replaced both the voltage regulator and the fuse (and corrected the amperages of fuses PO had installed) and she runs fine! Hope that helps, TJS -- 1978 FJ-40 TLCA #10713 |
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