Honda Accord 2012 LX-S MT: Intermittent shuddering while accelerating
Hi,
I’m trying to troubleshoot the cause of intermittent shuddering while accelerating. Here are some details: 80k miles with regular oil changes No check engine light, No faults found using the OBD2 reader from my local auto parts store. Idles fine Engine revs up and down fine Shudders at RPMs in all gears with reduced power. Shudders on a cold or hot engine. While not shuddering there’s plenty of power with smooth acceleration. Shuddering when it happens varies in intensity. Going into neutral and coasting with foot off the pedal (to allow the throttle plate to close) before going into gear sometimes clears the issue. No clicking sounds while turning the car - doesn’t appear to be a CV joint. What I’ve done so far: Cleaned out the throttle body and completed the idle relearn procedure to no avail. The throttle plate has a little play but returns to position as shown in the service manual. My current hypothesis is a faulty throttle position sensor and/or a loose plate axle is causing the intermittent shuddering due to a mismatch between what the computer reads and the actual position. As far as I can tell these sensors are integrated in the throttle body and cannot be serviced, right? I’m guessing the sensor is a potentiometer that might just need cleaning with contact cleaner…. Any help is appreciated. I am thinking of replacing the throttle body but will try to repair the sensor first if possible and see if that fixes the shuddering. I have tools and a DMM. |
Originally Posted by Gjpmho
(Post 43146)
Hi,
I’m trying to troubleshoot the cause of intermittent shuddering while accelerating. Here are some details: 80k miles with regular oil changes No check engine light, No faults found using the OBD2 reader from my local auto parts store. Idles fine Engine revs up and down fine Shudders at RPMs in all gears with reduced power. Shudders on a cold or hot engine. While not shuddering there’s plenty of power with smooth acceleration. Shuddering when it happens varies in intensity. Going into neutral and coasting with foot off the pedal (to allow the throttle plate to close) before going into gear sometimes clears the issue. No clicking sounds while turning the car - doesn’t appear to be a CV joint. What I’ve done so far: Cleaned out the throttle body and completed the idle relearn procedure to no avail. The throttle plate has a little play but returns to position as shown in the service manual. My current hypothesis is a faulty throttle position sensor and/or a loose plate axle is causing the intermittent shuddering due to a mismatch between what the computer reads and the actual position. As far as I can tell these sensors are integrated in the throttle body and cannot be serviced, right? I’m guessing the sensor is a potentiometer that might just need cleaning with contact cleaner…. Any help is appreciated. I am thinking of replacing the throttle body but will try to repair the sensor first if possible and see if that fixes the shuddering. I have tools and a DMM. |
Originally Posted by grcauto
(Post 43147)
Play? It should not have play.
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Originally Posted by Gjpmho
(Post 43148)
Thanks, Yes it wiggles a bit, as if the gear teeth are worn down. I am new to electronic throttle bodies. Will double check and upload a video soon. could the throttle plate play cause the shuddering?
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6 Attachment(s)
Originally Posted by grcauto
(Post 43149)
It's bad and may be the cause of the problem.
Also, I removed the battery cables and did some spot resistance checking on the throttle body pins. I couldn’t find the circuit diagram in the service manual. The resistance across pins 5 and 6 (where pins start with 1 on the left) is a few ohms and jumps while moving the plate. Here's the link to the video. https://drive.google.com/file/d/1b5z...ew?usp=sharing found the diagram. As it turns out you need a torx security bit to take off the sensor cover. https://cimg9.ibsrv.net/gimg/hondafo...0fed6a3f10.png |
Not sure if it's bad.
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Originally Posted by grcauto
(Post 43151)
Not sure if it's bad.
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Let us know how it goes.
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Originally Posted by grcauto
(Post 43154)
Let us know how it goes.
any other… ideas |
Let's see what the new TB does.
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