Problem after rebuilt TB

[tay97gst]

I just put on my rebuilt throttle body that i got from Steve at throttlebodys.com. After my test drive i noticed something odd. When i push on the gas it doesnt engage immediately, it takes an inch or so of pushing then the car goes. Also, when i let on/off the gas the car like lurches a bit, kind of like changing a gear quickly. I think it's either the TPS being not put on right or could the throttle plate be sticking a bit. Steve suggested it could be the IAC also but im not sure because that sensors pretty easy to flip into the rebuilt TB from the old.
What do you guys think?

 

[bryanwheat]

Did you adjust the throttle cable properly after installing the throttle body?

 

[tay97gst]

Did you adjust the throttle cable properly after installing the throttle body?

Sorry to sound ignorant but what adjusting would i have to do? I just figured the throttle cable wouldnt really change from one TB to another
Enlighten me on what adjustments i should check for. BTW Bryan I'm pretty sure you've helped me on every one of my posts so thank you, and thank you in advance for the next time

 

[bryanwheat]

Did you actually remove the throttle cable bracket from the intake manifold or did you just undo the cable from the tb. The bracket on the intake is slotted and if unbolted will have to be adjusted properly.

 

[viridionplague]

sounds like throttle cable adjustment. if the cable is not adjusted properly one of 2 things happens. either the throttle blade will never close fully. or in your case it sounds like there is too much slack.

there is 2 bolts that mount the cable to the intake manifold. they are on a slid bracket so you can loosen them and move it around until its adjusted.

make sure there is not any slack. and that when you manually move the throttle plate there is still a noticeable click to make sure the throttle closes all the way

 

[tay97gst]

Did you actually remove the throttle cable bracket from the intake manifold or did you just undo the cable from the tb. The bracket on the intake is slotted and if unbolted will have to be adjusted properly.

I just unhooked the throttle cable from the old on and put it onto the rebuilt one. I didn't unbolt it or anything. Also, when i first got the throttle cable on i had someone push down the gas pedal to make sure it shut and opened properly. I watched it go WOT and then shut so that's why i dont believe its the cable.

sounds like throttle cable adjustment. if the cable is not adjusted properly one of 2 things happens. either the throttle blade will never close fully. or in your case it sounds like there is too much slack.

there is 2 bolts that mount the cable to the intake manifold. they are on a slid bracket so you can loosen them and move it around until its adjusted.

make sure there is not any slack. and that when you manually move the throttle plate there is still a noticeable click to make sure the throttle closes all the way

I also checked for slack after i reinstalled the throttle cable and it seemed pretty tight when it was shut.

 

[snowborder714]

Open it all the way and let it slam shut. Then try to open it by hand using the throttle cable bracket. Do you notice any sticking, or does it open very easy and smooth?

 

[tay97gst]

Open it all the way and let it slam shut. Then try to open it by hand using the throttle cable bracket. Do you notice any sticking, or does it open very easy and smooth?

Hey Brian i was hoping you'd chime in, I just took off my elbow to see what the plate is doing while i step on the gas. I took a video but am having trouble loading it. It doesn't appear to me to be sticking but I really don't know for sure. I'm still pulling towards the tps being the culprit. I really didn't adjust the tps, i just swapped it over without any marks or anything. Could the TPS not being adjusted correctly cause this? I did also notice when i came to a stop light that my idle wasn't too happy, it was jumping a little bit.

Here it is: View My Video

 

[snowborder714]

Well, since you didn't really follow my instructions, that video is only partially helpful. I wanted you to open it by hand to really feel what is happening. You can't quite get the same feel when pressing on the gas pedal.

Yes, the TPS could have something to do with it (but I'm not positive if it'd be the main culprit). I've honestly never stepped on the gas pedal of a car with an uncalibrated TPS. Break out the multimeter and set it.

 

[tay97gst]

Yeah thats my next move, and sorry i made that video before your post. Ill do what tou said to. And im not sure if this matters but if i push the clutch in and let off the gas pedal it doesnt lurch. I dont think it helps but its something i noted. And there is no rpm change during the lurch.
How much slack should the cable have? I'd say it has 3/4-1" of play in the line upwards until it pulls on the throttle plate. Is it supposed to be pretty taught?

 

[rEclipserGST]

You have to re-calibrate the tps now. Thru dsmlink is how I usually do it.

 

[tay97gst]

You have to re-calibrate the tps now. Thru dsmlink is how I usually do it.

By recalibrate you mean adjusting it with a multimeter until it's dialed in? I don't have link What would happen if i reset the ecu? Would that reset the TPS or would it still be off?

I'd also like to point out that it's pretty much impossible for me to ease into the gas. When i lightly push the gas pedal it doesnt register and then when it registers it opens too much

 

[rEclipserGST]

By recalibrate you mean adjusting it with a multimeter until it's dialed in? I don't have link What would happen if i reset the ecu? Would that reset the TPS or would it still be off?

I'd also like to point out that it's pretty much impossible for me to ease into the gas. When i lightly push the gas pedal it doesnt register and then when it registers it opens too much

Exact symptoms I was experiencing after I unbolted and tucked my throttle cable under the intake manifold.

I guess you are limited on your adjusting options

 

[bryanwheat]

Adjust it with a multimeter. There is a good writeup on vfaq. You will also need a feeler gauge, but it is real simple.

 

[tay97gst]

So assuming it's my TPS not being dialed in right... If i use the multimeter and it shows me the values are indeed not what they should be then do i unscrew the tps and turn it more? then recheck the values? And would i have to re-remove my throttle body to adjust the tps if it's wrong?

 

[rEclipserGST]

No. Just rotate the tps. Mark with marker afterwards.

 

[tay97gst]

No. Just rotate the tps. Mark with marker afterwards.

Alright, i'll adjust in the morning and come back with my results. Thanks gentlemen.

 

[bryanwheat]

Basically you will unhook the connector, put a .45mm feeler gauge between the throttle stop screw and throttle linkage. Test between pins 3 and 4 with a multimeter set to continuity. It should have continuity with the feeler gauge inserted, and no continuity with the feeler gauge removed. If it doesn't than loosen the bolts and turn the tps clockwise and turn it to where it just has continuity and tighten the bolts back down. From there test to see if it doesn't have continuity with the feeler gauge removed.

 

[tay97gst]

Just got back from checking the tps. I just followed the instructions here, TPS Adjustment, and now it feels just like it did before i changed the throttle body. I think i still have to tighten my throttle cable up a bit to get rid of some slack. To do this do i just unbolt those 2 bolts and slide the bar down then tighten the bolts?