Leach Posted November 16, 2011 Report Share Posted November 16, 2011 second time this has happened to me since ive owned the car, car runs beautifully and then all of a sudden at take off it has like a missfire and boggs down. its an L14, just like an L16 just smaller crank, running stock hitachi 2bbl carb, with original aircleaner. can anyone tell me why this might be and what it is i should be checking for it idles fine and runs great at high rpm its just under load from stopped it boggs out and doesnt want to go anywhere as soon as i get to a high rpm in second gear it runs perfect again. the first time i just let the car sit for a few days and after that it ran perfect for like 3 months till now. Quote Link to comment
datsunaholic Posted November 16, 2011 Report Share Posted November 16, 2011 Bad accelerator pump, be my guess. That or a clogged jet, but that would be way more than a "bog". Quote Link to comment
datzenmike Posted November 16, 2011 Report Share Posted November 16, 2011 So it works fine at times and at others it doesn't? I had a small flake of crap (casting??) below the primary jet and sometimes (usually after hitting a large bump) it would get sucked up and stick against the jet partially blocking it and ruining any performance. If you could get it revved up into the secondary it ran ok. All I could do was stop and shut it off count to ten (to let it settle down) start and be on my way. The only cure was to remove the carb and unbolt the little primary 12mm 'drain plug' just below the front sight glass. When the gas ran out onto a rag, out came this little flake of aluminum. Never did it again. Quote Link to comment
ggzilla Posted November 16, 2011 Report Share Posted November 16, 2011 This happened to me several times. In my case it was dirty fuel bowl. There was little bits of stuff/water/dust in the fuel bowl -- stuff that got past the fuel filter somewhow. Each time I drained it using the external 12mm plugs, then it would run fine for a few months. The tank must have flushed out because after 9 months it stopped happening. Quote Link to comment
Leach Posted November 16, 2011 Author Report Share Posted November 16, 2011 Ill have to check the carb when I get home from work tomorrow. I thought it might have something to do with my distributor. Quote Link to comment
banzai510(hainz) Posted November 16, 2011 Report Share Posted November 16, 2011 distributor is EZ to ck for looseness, but once loose it will do it all the time. I would look more at the carb. Tana had this same proplem with her stock carb hitachi on a 521. run good then bad ,I also thought it was the dizzy but ckedand swapped in a a weber ran good Quote Link to comment
Leach Posted November 16, 2011 Author Report Share Posted November 16, 2011 distributor is EZ to ck for looseness, but once loose it will do it all the time. I would look more at the carb. Tana had this same proplem with her stock carb hitachi on a 521. run good then bad ,I also thought it was the dizzy but ckedand swapped in a a weber ran good Do you think I should just slapp on a, set off dual 40s I have? can my motor handle dual 40s? Quote Link to comment
ggzilla Posted November 16, 2011 Report Share Posted November 16, 2011 Sure dual 40s are good for small engines. How good depends on the venturi size. Some 40s have small venturis and some have large venturis. But it may not solve the problem.... better to test it first, confirm the problem. But if you really want the 40s, now is the time to do it. Quote Link to comment
Zfighter76 Posted November 17, 2011 Report Share Posted November 17, 2011 dooit! seems like a simple fix though if you were going to save those carbs for your fj20 . i would just rebuild the whole carb, takes like an hour or so and youll be sure to have no more carb problems. Quote Link to comment
ZackTheImpaler Posted November 17, 2011 Report Share Posted November 17, 2011 I'm haveing this same problem right now In fact my truck died out on my way out to oregon today, and is parked in a lot and I rented a car. Seems clogged jet is the consenus on mine too. Happend after I ran fuel system cleaner. Quote Link to comment
Leach Posted November 18, 2011 Author Report Share Posted November 18, 2011 The carb is a nikki not hitachi Looking for a good mechanic in long beach ca area to take a look at her I cleaned the carb and its still doing it, I took apart the whole bowl and it still happening And nvm about the 40s there dual 44s that I have and I think there too big for a 1.4 No I have dual 48s for the fj20 Quote Link to comment
ggzilla Posted November 18, 2011 Report Share Posted November 18, 2011 I cleaned the carb and its still doing it Well there is more than one cause for that symptom. air leak (vacuum leak) can do it. Even a worn distributor shaft could do it. As for the carburetor, check for correct accelerator pump working at very low throttle openings -- or just slap the 40s on. Quote Link to comment
Leach Posted November 27, 2011 Author Report Share Posted November 27, 2011 Accelerator pump arm is worn out so it rotates the pump enough for it to bogg buying a new set of 40 side drafts this week Quote Link to comment
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