i have Nov/'85 FJ60, desmogged, runs rough on startup (fine with 3/4-full choke) and for the first 3-4 miles, low power at the beginning of 1st gear and 2nd gear. 3rd and 4th ok but seems the low end is having trouble. Once it gets up to full temp its fine. Was thinking i might rebuild the carb to clean out the jets, inspect the floats etc, but looks like you can get a replacement full carb assembly for just a little more than a carb kit. What do you guys recommend? fyi, i replaced a new fuel filter, new plugs (properly gapped) and has an upgraded DUI dizzy+wires. nothing seems to positively impact the performance. (plugs looked great also when i pulled the old ones)
Rebuild with kit or just replace-FJ60 Carb
- Thread starter Rokketz
- Start date
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don't cheap out on the carburetor. The City Racer is a good idea.
There are some easy checks you can do before rebuilding or replacing:
There are some easy checks you can do before rebuilding or replacing:
- Idle Mixture: see if you can adjust it to improve your idle experience
- accelerator pump: I don't know how to quantify it, but you can check to see if it is working. remove your air cleaner and with the engine off, move the throttle linkage by hand and see if fluid squirts out into the primary bore. fluid should start coming out almost as soon as you start moving the linkage.
- Secondary Diaphragm. The throttle plate on the secondary bore is controlled by vacuum. There is a large vacuum diaphragm on the front of the carb with linkage that attaches to the secondary throttle shaft. There is a "paperclip" test where you put a paper clip on the linkage tight against the diaphragm body. Go drive around under conditions where the secondary throttle should open (up a hill). check to see where the paper clip is. if it has moved down the linkage, then the diaphragm is pulling the throttle plate open. If the paperclip is more or less in the same place your diaphragm may not be working.
- Thread starter
- #4
thanks! those are some good troubleshooting ideas, the idle seems fine, its just when its under load ( from 0-10mph in first gear, it wants to bog down and stalls out unless i rev up the rpms or have the choke at 3/4 or so.....then after i shift to second same thing, the first little bit after i shift to 2nd it wants to bog down. once the vehicle gets up to operating temps the symptoms go away but it just seems like somethings not right.
What size tires are you running. Yes, I realize this question sounds weird...
- Thread starter
- #6
31x10.5 on stock rims.
Asking because these engines, with their gearing, were tasked with rolling on 28” diameter tires. Going larger will require revving higher to get into 1st & 2nd gear. 31’s aren’t too bad though. I was trying to think outside of the box in case we were missing something. Carry on!
- Thread starter
- #8
going to do a carb swap this weekend hopefully and see if that helps any,,,,,if it does then i will rebuild the OEM one and keep it ready for when the aftermarket one craps out...might be a few years though
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