tooter's manifold adventure...

[JustDidIt]

awesome update!

[dragoonmc]

that looks awesome!

[tk-421]

55mm sounds about right. I made this exact mod a couple of years ago and I've had zero problems. I do have a high idle, but there's nothing I can do about that, since the idle screw has some epoxy on top of it. Ah well.

That erratic behavior should go away after a couple of trips (at least it did in my case).

[Bluevitz-rs]

Mabey something got messed up on disassembly/re-assembly?

[suckerface]

Originally Posted by Bluevitz-rs

Mabey something got messed up on disassembly/re-assembly?

This. Astroman and myself aren't the only ones to have plug and play success. I'm guessing something went awry when you started the chip swap drilling and pulled the epoxy off the idle screw.

It took a good 10-15 min for my yaris to calm down at first, then a few minutes the next couple starts. Within a few days, it'd idle high for about 90 seconds when I first started the car. Drove it like that for about a year until the wreck. Didn't touch a thing on the TB except with some degreaser to clean it up.

Also ran it with an SRI. Regular tubing size, just used a section of silicone tubing as a makeshift adapter. I'll try to find you my pics if you want to compare.

[tooter]

Originally Posted by Bluevitz-rs

Mabey something got messed up on disassembly/re-assembly?

Nope. I was super careful having read what everyone else did. Even picked out the epoxy real careful. The idle screw underneath is absolutely pristine...




I'm going to give it a couple of cycles, just to see if anything gets better. I'm for sure going to swap out the chips to get rid of that really irritating delayed throttle notch between light throttle and decel. The chip behaves as if it was made to control the throttle for an automatic transmission as likely the majority of them were.

Funny, if the 030 was supposed to be the good one. Makes me wonder what an 031 was like?

[suckerface]

Might be a stupid question, but you confirmed on the part itself that's it's the proper part number?

[tooter]

Yes. The number is clearly printed on the chip. The throttle body itself is in excellent condition, and nothing on it had been buggered around with. I'm going to cycle it some more before I swap the chip, just to see if things get any better and I'm definitely going to turn the idle down!

[cali yaris]

No one listens to me. I sold at least five pre-swapped TB's and none of my customers had issues. Swap the chip.

[tooter]

Originally Posted by cali yaris

No one listens to me. I sold at least five pre-swapped TB's and none of my customers had issues. Swap the chip.

Got it, Garm.

[tooter]

Originally Posted by cali yaris

No one listens to me. I sold at least five pre-swapped TB's and none of my customers had issues. Swap the chip.

Hey Garm,

Swapped out the chips and the throttle body does work a little bit better. It only goes to 2,000 now while suddenly deciding to hunt around for an idle speed. And it still has that 2 second delayed jerky drop on decel that makes the drivetrain shudder. I did turn the idle down 1/4 turn. It needs more, but at least I can do something about that issue.

Driving at speed is strange, you just rest your big toe on the accelerator and it holds 40 mph Even partial throttle and the engine is eagerly accelerating. Clearly this thing is capable of feeding lots of air into the engine without hardly any angle on the butterfly. This makes the throttle extremely sensitive. Now that's not a complaint as it's not so much so as to be unsafe. It will just take some driving to get used to it.

All in all, at least some improvement. Do you have any other ideas? Particularly about the two second delay of the jerk on decel. If I just barely have the throttle pressed, the jerking cycles back and forth constantly. It feels like it has lost the ability to smoothly transition from throttle to decel, and the delay tells me that it is computer related because it is so perfectly evenly timed.

Even running both chips the throttle body has never thrown a CEL light... so at least that's good.

Greg

[bladesmith6]

I swapped the chip on the tb I had and still had issues. The high idle finally came down a bit but when you let off the pedal to decel the car got kind of herky-jerky(bucked) I finally took it off because of that. You could feel that the acceleration was better though....

[tooter]

Originally Posted by bladesmith6

I swapped the chip on the tb I had and still had issues. The high idle finally came down a bit but when you let off the pedal to decel the car got kind of herky-jerky(bucked) I finally took it off because of that. You could feel that the acceleration was better though....

I hear ya on the bucking... it's flat out undriveable.

I'm swapping out the chip right now and am going to also turn down the idle, and will see what happens.

[Bluevitz-rs]

If you remember the old fashioned fueling devices called a carburetor, they had a device called a dashpot that holds the throttle partially open while you release the pedal and acts as an emission control device. The computer treats the electronic throttle the same way. But because the throttle is larger the effect is greater.

[tooter]

Originally Posted by Bluevitz-rs

If you remember the old fashioned fueling devices called a carburetor, they had a device called a dashpot that holds the throttle partially open while you release the pedal and acts as an emission control device. The computer treats the electronic throttle the same way. But because the throttle is larger the effect is greater.

Yeah, I'm familiar with those, because I'm from that era.
...but they let the throttle down slowly and smoothly. This waits 2 seconds and then suddenly drops it shut. This is a precise computer timed event as it does it exactly the same each time.


So this brings me back around to the same question:


Has anyone here ever successfully run a Corolla throttle body with none of the issues I'm experiencing?

[suckerface]

Originally Posted by tooter

Has anyone here ever successfully run a Corolla throttle body with none of the issues I'm experiencing?

As mentioned, aside from the fluctuating idle at cold start (which only lasted 1-2 minutes) I had ZERO problems with mine. Also had an SRI on it. Same part number as yours, just cleaned it up and slapped it on. No chip swap. Didn't even clean the epoxy off the idle screw.

I'll do some digging to see if I ever did a video of it.

[tooter]

Originally Posted by suckerface

As mentioned, aside from the fluctuating idle at cold start (which only lasted 1-2 minutes) I had ZERO problems with mine. Also had an SRI on it. Same part number as yours, just cleaned it up and slapped it on. No chip swap. Didn't even clean the epoxy off the idle screw.

I'll do some digging to see if I ever did a video of it.

I'm glad to hear that,sucker...
At least it worked right for one person here. I'm also glad it worked with your SRI so I can rule out that variable on mine. I can say that when you step on the gas... man, it roars!



The noise could be deceptively making the car feel like it's faster, but the dyno will provide an objective answer that.

Even if all of the issues aren't sorted out, when I get the ECU to a stable point, I'm taking it down to Harry's dyno shop!



Greg

[bladesmith6]

You know i was thinking about this , this might be the case where one of those aftermarket throttle controllers is just the thing. You have to calibrate them when you plug it in between the accel pedal and the obd II port anyway, it might correct the bucking issue...