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What stops my transmission from staying engaged when i let off the throttle? when i acceloerate the rpms have to catch up to the speedof the van,it still up shifts like it should
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If old van you have a carb. Jet plugged with trash. If you have fuel injection or throttle body injection, one or more of your jets is partially blocked. Try a cleaner added to your fuel tank. May end up replacing the part/s
People this is a scooter. The problem is that your idle screw on the Carb needs adjustment. The idle screw can be adjusted with a Philips screw driver. Follow your throttle cable to the carb. You'll see a screw that pushes a pulley down raising your rpms. This will lower your idle causing the rpms to drop and since your scooter transmission is propelled my higher RPMs the bike will stop thrusting you forward when you stop at red lights.
The speed sensor on the transmission along with the throttle position sensor on the engine deliver the signals to the transmission computer dtermining shift timing, the throttle position sensor is probaly out of wack, there should be a stored trouble code however this transmission code can only be read by a transmission shop or the dealership, I guess you could change out the TPS sensor easy enough however this is merley an educated guess on my part to be sure have the computer checked for stored trouble codes.
Seems you may have a varnished up transmission valve body, try the conservative approach first, have the trans serviced and flushed with transmission conditioner additive installed along with new fluid...
Ford : back the truck up 10ft put truck in neutral and disengage four wheel low. (You can't drive in four wheel low cause its a pulling gear and you won't do over 3-5 mph.)
Nissan: start truck see if it idles normal. If so rev motor and check throttle for sticking and check EGR valve make sure its not stuck open or malfunctioning when you drive it..
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