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Hey guys, i'm having an issue with the carb on my 22r. it has an aftermarket National brand carb (supposed to be a direct oem replacement). My issue is when the truck is parked facing downhill after the engine is warm the engine will stumble and sputter and nearly stall out when starting from a stop (low rpms) it idles normally, and accelerates normally once it gets past that point, around 2000 rpms or more is fine. it takes a good stretch of road where you can drive it harder and it will go back to normal. It mostly only happens when parking downhill, sometimes more often on very hot days, and makes it almost impossible to do any sort of slow speed offroading. none of my fuel lines are too close to the engine or anything very hot but when it is happening you can smell fuel, which makes me think the float bowl is flooding, but whenever i check the level, it is always in the middle of the sight glass.it only happens when starting from a stop or shifting into second, any situation where i might be using the low end rpm, it seems like it is getting far too much fuel, do you think my carb might just need a rebuild? could it be the AAP (auxiliary accerator pump)? or something more?
Hey kaalsb,It sounds like it could be the AAP. As I remember you can carefully remove it with 3 screws. It’s a little tricky to get to. It has a rubber diaphragm that fails because it gets a hole in it and allows excess fuel into the mixture.http://www.offroadforum.cz/toyota/aarc.epnet.com/application/8578/8578R04_Auxiliary_Acceleration_Pump__AAP.htmlhttps://www.google.com/search?q=22r+carb+rebuild+kit&rlz=1C1AOHY_enUS708US708&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjd-_fJs4LQAhXogVQKHc7aDUAQ_AUICSgC&biw=1024&bih=633#tbm=isch&q=22r+carb+AAP&imgrc=vKa1UZ8O_QZq_M%3ACheck the vacuum hose as well.http://www.autozone.com/repairguides/Toyota-Pick-ups-Land-Cruiser-4Runner-1989-1996/EMISSION-CONTROLS/Auxiliary-Acceleration-Pump-AAP-System/_/P-0900c15280060d7fHave you physically checked the float level?Gnarls.
Thanks for the reply Gnarls. i haven't physically checked the float level, just peeked at it through the wee sight glass. i will source a new AAP diaphragm and pop it in and report back.
well, i got the new diaphram in, the old AAP looked to be intact. it looked like it may have had a tiny pinhole in it, but i couldn't tell. i parked the truck facing downawards in my driveway for 15 minutes and took it out for a drive and it seems to be operating correctly, but it will take a week of driving to tell for sure.
Whelp, week of driving down and the issue re-appeared today. i was stopped on a steep downhill at a red light for a minute or so, and about 2 blocks later my truck starts to sputter at low rpms again, I parked the truck for about 15 minutes and went to start it again and it was tough to start, issue persisted until I got out for a short stint on the highway and it went back to normal.i guess i'll check the vacuum line next. what was it about checking the float level again?maybe a carb cleaning is in order.
This sounds like the carb is flooding? Does it act like the choke is on and blowing black smoke?Gnarls.
http://board.marlincrawler.com/index.php?topic=81651.0Gnarls.
...hopefully this cheapo fuel pump doesn't give out too soon!
Where do i find a kyosan pump? The link gnarls left me for 22reperformance only lisys it as a "OE part" having a tough time finding an actual kyosan pump
I agree, but OEM and OE can mean different things. OE can stand for original equivilent (likely junk), or original equiptment. hard to say, i know 22re performance is a pretty reputable source, but, Parts geek (which i haven't ordered from before) is listing the pump as a kyosan for a bit cheaper.
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