20V Missing - Help?

[Sanxta]

Yo, so as above my car is bogging down/missing when the accelerator goes down. Ive done the leads and spark plugs, and the air intake isn't blocked or restricted.

What else could be the cause of this? I'm gonna reset the ECU tonite but I doubt that will do anything for my case . . .

Cheers for any help,
Adam

[pc]

Not sure, but could this be a faulty TPS? (throttle position sensor)

[Sanxta]

possibly - the car goes no where for a bit then suddenly jerks - does that sound like the kind of symptom caused by a faulty TPS?

[Fuct Munkey]

sounds kinda like what mine is doing on mid to full throttle it will misfire till it feels kinda like vvt is engaged. but mine only does it when warmed up. so it makes it all or nothing. sad part is, just put a new engine in, to try fixing it ive just done plugs, leads, cap, rotor, coil, ignition module. . . no such luck. checking wiring next, then ecu, also replaced tps, and adjusted numerous times, also tried adjusting timing.

[slowke]

same thing is happeneing with my mates legacy. in his case it is the afm not running properly, check that

[Mr. Mainstream]

do you need the throttle position sensor on 20V's? On B6T they can go in the bin

[bad20v]

sounds kinda like what mine is doing on mid to full throttle it will misfire till it feels kinda like vvt is engaged. but mine only does it when warmed up.

If it does it @ bout 3500 rpm when you slightly back off the throttle then, according to sum technician guy @ toyota, its a factory fault. I had the same problem in my ae101, he said it's a change from the engine being on vvt and coming off vvt. Sort off like the opposite effect of when vvt kicks in. Thats jst wat ive ben told.

[offensive]

my 101 used to do it, especially when it was warming up, when it was at running temp it would settle down abit. Back then it was running a blacktop with silvertop ecu, afm etc. As soon as it got running blacktop ecu, map it stopped doin it, runs sweet now.

[Fuct Munkey]

nah, like my car becomes undriveable. unplugging the TPS makes it run better, less repsonsive, flat, but not so missing like. yea, havnt really tested the AFM mite giv that a go. anything is a good idea at the mo, its seriously sick! if someone told me to stick an apple in the engine bay to fix it i would probably giv it a go.

[sergei]

check ignition coil (listen if it makes static sound, look if it glows at night)
check if tps set properly -> use multimeter in Volts, measure voltage between red wire (3rd if you counting from front of car) on tps, and GND, it should read 0.5V (500mV) if not adjust TPS, then slowly open and look at the voltage, if its steadily increasing whithout jumping to 0 in some spots its all sweet, after you done that reset the computer, don't open AFM it will lead to no good, there is nothing there to adjust.

[mr20v]

my mates blacktop did the same thing but due to a disconnected lambda sensor, or perhaps a knock sensor. just chugged away in the when accelerating at a middly sort of level but fine when accelrating hard or real softly.

[Truenotch]

My ae86 was doing the same thing, no power till 2500. All it was in my case was a split hose from the plenium to a sensor on the firewall. Put on a new one and it ran sweet. Could pay to check them out maybe.