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My truck is 91 f150 5.8l 351w with an e40d transmission. i pulled codes and nothing came up. it shifts super hard from 1st to 2nd but shifts completely fine through all other higher gears. i only notice it when driving through a parking lot going about 10-15 mph, the truck shifts hard and seems to shift late? anyone have any ideas about what could cause this problem?
My truck is 91 f150 5.8l 351w with an e40d transmission. i pulled codes and nothing came up. it shifts super hard from 1st to 2nd but shifts completely fine through all other higher gears. i only notice it when driving through a parking lot going about 10-15 mph, the truck shifts hard and seems to shift late? anyone have any ideas about what could cause this problem?
Define nothing..... Did you get the all clear( 11/11 or your truck is most likely 111/111) or as you stated, "nothing". If it is the latter then you have a problem pulling the codes. Try cleaning the STI and ST0 connector pins.
Throttle Position Sensor. It mounts on the bottom side of the throttle-body. Does the problem get worse as the truck heats up? A bad TPS can be heat sensitive.
is your speedo bouncing at all by chance? you might pull the rear abs sensor out of the top of the diff and clean it off good and put back on. when was the last time you serviced your rear diff?
okay so i got a new TPS and i notice a difference but it still didnt fix the problem that i had. it only does this sometimes but it almost seems like the shifter or pedal gets stuck into gear and then all of the sudden it slams back into the right gear? this only happens when going like 5-15mph? it jerks the truck super hard does anyone know what could be causing this?
a hard shift from 1st to 2nd means that it's shifting with full line pressure and not the solenoid. This is what I was told by the Trans shop that used to be known for excellent work. I would check the mpls (SP?) and go from there.
not trying to hijack the thread or anything but my gas pedal will sometimes vibrate during a shift and at low rpms until it shifts again could this be tps?