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Installed new Denso (toyota) TPS today, problem solved. Beware of aftermarket TPS's.

Its been almost a week with the old worn out TPS installed and adjusted, and the bucking/jerking has completely vanished. I will report back once i get the new toyota TPS. Hope this post helps someone with a similar issue. Lesson learned; even newly installed parts should be questioned.

that's something else i've pondered.the connector is questionable, its cracked up a little from heat, and the metal bail is missing from it, but you have to give it a tug to get it to come off of the sensor. any idea if toyota sells a new pigtail for the tps? My shift quality is still goofy...

thanks nick, that confirms what i thought understood about the function of the idle contacts. I tried setting the questionable tps so that the idle contacts would open if you even gave the throttle a dirty look, and same thing occured (the jerk) . Tried setting it so the idle contacts were...

Thanks for the reply , Nick. I dont have access to a scope, only a digital multimeter, so its a real pain trying to test a potentiometer of any sort. The replacement TPS (the one in question) felt much lighter and of cheaper construction than the OE unit. In retrospect ,the replacement tps...

Edit- performed resistance test on tps terminals VTA and E2, found 4k-5k instead of .2-1.2 per tsrm. Tried to fine tune that value, and found that it would spike to 15k with very slight movement, idle switch still closed. Reinstalled worn OE sensor and readjusted. I've put on 30 miles so far...

Hi, this is my first tech post, hope i'm doing everything according to hoyle. I've got an 86.5 n/a automatic, 104,000 miles on the odo, and when its up to operating temp, and i'm cruising under light throttle, i get a quick "buck" or hesitation, then it's fine for awhile sometimes, sometimes...

---------- Post added at 10:16 PM ---------- Previous post was at 10:13 PM ---------- It's an 86.5 n/a ,automatic, hardtop , white, with 104,000 miles. It's ready for some work to be done on the suspension, but otherwise in pretty good shape, no rust underneath. It's also got an annoying...

Hi Everyone, glad to be a part of the community. I basically came here hoping to soak up some knowledge , and maybe even share a little with the noobsters. I've always driven Japanese imports , big fan of the durability. I've had ASE certification in engine performance and engine repair (for...

Gnarles_Manson/Eric