Hi!


I've been scouring the forums and trying to come up with why my 22RE is surging at idle. It doesn't get really bad until it's warm.


Here's what i've done so far:


* Replaced all vacuum lines including brake booster lines
* Super super super clean throttle body
* New throttle body gasket
* New IACV and gasket
* I had a shop do a smoke test to see if I had any vacuum leaks but nothing was found
* New o-ring on the idle screw
* Cleaned out the coolant hoses that attach to the IACV
* Made sure there wasn't air in the coolant system
* I even unhooked the throttle cable to make sure it wasn't too tight and it's fine
* Throttle plate/butterfly thing doesn't seem to be hanging up
* Timing is at 5deg


So here's where i'm currently at:


I took the throttle body off to check/adjust the TPS. Now my truck won't rev past 2000 rpms unless I unhook the TPS sensor (and it still has an idle surge so is it the TPS??). Clearly I did something wrong. My issue that i'm having is that when I go to adjust the TPS i'm not getting the infinite ohms that i'm supposed to be getting on step 3 (E2-IDL) with the .085mm feeler gauge. Here's where it gets even stranger. When I take the TPS off and test it without it attached to the throttle body, i'll get the infinite ohms (when I rotate the arm inside the TPS) on step 3. What in the hell am I doing wrong? I'm losing my freaking mind over this. Does it absolutely have to be mounted to the motor while I test? I'm lost.


I've spent hours trying to figure out how to get the right readings off of the TPS while it's bolted to the throttle body and i'm just plain stumped --- not to mention the time spent trying to diagnose this idle surge.


Hoping ya'll will have some insight for me so I don't lose my damn mind even further.


tldr; I have an idle surge. I did things. None of them fixed it. I tried to adjust/test the TPS (it seemed to be working fine apart from the idle surge) and now I can't drive my truck unless the TPS isn't hooked up. HELP! Also what else could be causing this?

 

What year is the throttle body/engine?
What year is the tps sensor?
What is the relationship between the paddles that engage the throttle body and the mounting ears.
(I kind of think you have the wrong sensor or are putting it together wrong.)

Honestly the tps adjustment isn't that complicated of a task, sorry if that comes off caustic, you are simply taking the slack out of the engagement between throttle plate blades and tps blade (paddles)..


You mentioned nothing about the idle RPM or the RPM range it is surging through. This soo very commonly just a too high of a base idle speed which triggers the cut off in the ECU because it is seeing the idle signal and the rpms are to high and it is shutting off like it is supposed to.


Since you have the throttle body in hand the throttle plate is exposed it's a quick check to see if the shaft attached to the throttle.plate has worn out the throttle body. Wiggle both ends of the shaft, there should be no noticeable movement (audio visual test). Open it slowly from the throttle pull, close it slowly does it reliably return to the same position.?Open it and let it snap closed, does it return reliably.? Do you have manual transmission which means you have a dashpot, is this dashpot sticking and not letting the throttle plate return to the same position?

.. I still don't understand where this "I need to take the throttle body off to test and adjust the tps" thing started it just adds more complexity to the issue as it introduces more chances of unknowns/errors..

 

Hi,

Even with the tps sensor completely removed from the throttle body it still surges.

Idle was set at 750 rpms.

The throttle butterfly doesn't seem worn. It closes quickly and doesn't have excessive play. The previous owner removed the dashpot although I do have the one from another throttle body. I've used 2 different throttle bodies, both used, and they both do this when I connect the tps. I've tried 2 other tps. Is it possible I've got 2 bad throttle bodies and 3 bad tps units???

It's an 89 22re. The sensor is 198500-0201. It WAS working fine until I decided to test the tps and now I can't drive the truck unless it's disconnected. If I connect the tps I can get it to idle a little smoother but the surge is still there. Problem is I can't rev it past 1500 rpms with the sensor connected now.

The big question now is why is it surging with the tps completely removed? I'm assuming that it's not tps related.

Edit: the paddle ears are in correct orientation.