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decided to clean my throttle body today and empty the oil catch can. I also replaced the idler pulley on passenger side and tensioner. Could’ve replaced the serpentine belt but autozone gave me a belt that was longer than the one I took removed ( no clue how that happened when they typed in my car details). It was clearly too much slack once I removed the pin from the tensioner. Moving on, I replaced all the parts and threw the old belt back on because it was getting dark. Figured I’d just drive to autozone and get the correct one. Tensioner torqued to 20nm and idler pulley to 35nm.
I double checked the vacuum hose was reattached to the elbow that connects the TB and air filter and I attached the connector for the throttle body and the sensor for the elbow. I didn’t replace the TB gasket (It was supposed to arrive with my idler and tensioner but didn’t).
Those were all the parts that I touched. I attached the oil catch can at the end of the job but being as though everything was tightened already, I wasn’t able to get the little small rubber nub flushed with the elbow and the catch can but it was definitely on securely. I tried to push it up as much as I could to get it flushed and continued to reassemble everything. Also, the 4 long screws to the TB were creaking and squeaking at almost every turn until they got loose. The same for reinstalling. In the videos I watched, the screws seem relatively quiet when removing. Not sure if the old plastic that the screws were going into was showing signs of being old and in need of replacement but I didn’t have that replacement part for that so I went ahead and reinstalled everything. Had to apply some forced to keep the TB flushed with the engine to help reduce the loud squeaky noise from the screws when getting tight. I FINALLY started using he car and it sounded so good on the startup until about 5 seconds later when the idle started spazzing out sporadically. The car felt like it was choking for air and I tried to let it run for a few mins but no improvement. I turned it off and started it again. Same super rough idle and then it stalled. By this time it was night time. I went inside for warmth and refreshments. Did a little research on resetting the TB with the foot pressed down with key in position two method. That didn’t work. I let it run until I got the check engine light on for code P0505 then I shut it off. I’m now exhausted but not defeated.
Didn’t see any cracks from vacuum line I removed from the elbow. I am wondering what it could be that’s reducing my air. Maybe the gasket on the TB is old? Could something I sprayed gotten in contact with he connector at the bottom of the TB? Maybe I didn’t connect the catch can all the way for it to be flushed? I’m really lost for words because I followed the video by Senior Leigh to every detail.
today is day 2 and I just sprayed MAF cleaner on the MAF sensor connected to the air filter. I realized that when I removed that sensor the car idle wasn’t surging up and down. But it was at a high 1100 rpm at idle. I sprayed cleaner on the sensor and connected everything. The rough idle is back. No surging but I feel the vehicle shaking. Idle is steady at 700 rpm
Ok immediately after submitting that last post, the surging started back. I cleared the codes to see that new codes might appear but the car stalled before the check engine light came back on. I am going to try to remove the TB again and clean it again and reconnect everything because I am lost now
Tell me did you disconnect the battery at any time, if so when ?
Resetting the ECU is done with engine OFF. It sounds like you did a Reset with engine idling: yes/No ?
> RECAP:
-- Cleaning TB caused the ECU to fail controlling engine idle rpm.
-- Reset pedal procedure produced nothing positive.
-- You double checked your work, all is well.
From what you described, you did not make any mistake. Except perhaps yanking on the butterfly to misalign it.
I have overalled a similar TB to oil the shafts, grease the gears and clean carbon deposits. No problem, perfect outcome!
Can you describe the handling of your butterfly???
It sounds like the only thing left to do is to force the ECU to relearn its TB adaptations as if new.
Tell me did you disconnect the battery at any time, if so when ?
Resetting the ECU is done with engine OFF. It sounds like you did a Reset with engine idling: yes/No ?
> RECAP:
-- Cleaning TB caused the ECU to fail controlling engine idle rpm.
-- Reset pedal procedure produced nothing positive.
-- You double checked your work, all is well.
From what you described, you did not make any mistake. Except perhaps yanking on the butterfly to misalign it.
I have overalled a similar TB to oil the shafts, grease the gears and clean carbon deposits. No problem, perfect outcome!
Can you describe the handling of your butterfly???
It sounds like the only thing left to do is to force the ECU to relearn its TB adaptations as if new.
Experiencing the same problem,
how do you reset ECU, reset pedal, .. did several rest on TCU already but ECU and pedal reset what is the procedure?
Tell me did you disconnect the battery at any time, if so when ?
Resetting the ECU is done with engine OFF. It sounds like you did a Reset with engine idling: yes/No ?
> RECAP:
-- Cleaning TB caused the ECU to fail controlling engine idle rpm.
-- Reset pedal procedure produced nothing positive.
-- You double checked your work, all is well.
From what you described, you did not make any mistake. Except perhaps yanking on the butterfly to misalign it.
I have overalled a similar TB to oil the shafts, grease the gears and clean carbon deposits. No problem, perfect outcome!
Can you describe the handling of your butterfly???
It sounds like the only thing left to do is to force the ECU to relearn its TB adaptations as if new.
good morning. After spraying the MAF sensor on the air filter with MAF cleaner and letting it dry, there was no difference when I started the car back up. I then decided to remove the throttle body just to double check the gasket and BOOM it was pinched I guess from reinstalling. I am going to the dealer in about an hour to buy a new gasket and possibly some new clamps for the elbow between TB and MAF sensor on the air filter. I hope the pinched gasket was the culprit behind the sporadic idle jump (was told that it more than likely is the culprit)
I was pretty sure I did nothing wrong. I thought maybe the TB was bad because I heard a spray can like rattle inside when I was turning it around to clean it. Any idea if that’s a bad sign or normal noise?
I understand that but do you know what’s shaking inside? Kinda wanna just change the gasket and make sure that everything is back to normal before I go to that job
I understand that but do you know what’s shaking inside?
Kinda wanna just change the gasket and make sure that everything is back to normal before I go to that job
TB has nothing loose inside that can cause it to jam open.
The ECU will limp mode in a heart bit should TB position escapes control.
You don't want loose chunkies to jam the butterfly gear reduction. I do not know what can be rattling inside your TB.
One would say replace it... I'd open my own unit.
++++
You've found the gasket issue was likely causing your DTC, good deal 👍
Last edited by CaliBenzDriver; Mar 20, 2023 at 01:37 PM.
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