Low Idle, Tried some Fixes, Need more Suggestions Please
03-25-2014, 06:51 PM
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Low Idle, Tried some Fixes, Need more Suggestions Please
Hello,
I'm having major problems with a low idle on my Honda Civic D17A1. On startup, it idles at 1100-1200, but once warm, it goes down to 750 and then slowly starts dropping to 500 to the point where the car starts to shake and at times will stall.
I've cleaned the IACV valve and my throttle body which didn't seem to be super dirty. I've checked for vacuum leaks in and around the thorttle body and haven't found anything. When I cleaned the throttle body, I did notice an improvement, but 10 minutes later it was bogging down again.
Is there something I'm missing or I could look at?
Thank you for any help,
Tom
I'm having major problems with a low idle on my Honda Civic D17A1. On startup, it idles at 1100-1200, but once warm, it goes down to 750 and then slowly starts dropping to 500 to the point where the car starts to shake and at times will stall.
I've cleaned the IACV valve and my throttle body which didn't seem to be super dirty. I've checked for vacuum leaks in and around the thorttle body and haven't found anything. When I cleaned the throttle body, I did notice an improvement, but 10 minutes later it was bogging down again.
Is there something I'm missing or I could look at?
Thank you for any help,
Tom
03-26-2014, 05:43 PM
#2
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Re: Low Idle, Tried some Fixes, Need more Suggestions Please
Try resetting the ECM/PCM: With the ignition OFF, remove fuse #6 in the under-hood fuse/relay box for at least 10 seconds.
03-26-2014, 06:01 PM
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Re: Low Idle, Tried some Fixes, Need more Suggestions Please
Sorry, but I forgot to mention that I have reset the ECM also and that unfortunately did not help.
I read somewhere that when you clean the TB, you should reset the ECM.
I read somewhere that when you clean the TB, you should reset the ECM.
05-02-2014, 11:08 AM
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Re: Low Idle, Tried some Fixes, Need more Suggestions Please
Had the same low idle problem (amongst others) with my 2005 Civic LX with 160k. Reach under the drivers side of the intake manifold (need a small hand) and beside the line to the PCV there is a small rubber seal or plug on an unused port (part #22 on the intake manifold diagram). Pull it off and see if it is cracked. Mine was cracked and I replaced with a piece of vacuum line with a bolt inserted and it idled fine.
However, my short term fuel trim was still high (15 - 20 %) and further investigation revealed a crack in the exhaust manifold/converter at cylinder 4. Apparently a common feature in Civics - interestingly the converter to frame stay was also cracked - leading to me to surmise that the cracked stay allowed excess movement of the manifold leading to the crack. Maybe, maybe not, but I will be inspecting the new (welded) stay on a regular basis. That is, once I get it all back together.
Waiting on a new manifold and hoping to reuse the air/fuel ratio sensor and O2 sensor. They were working fine but will they come out? They look like NGK ($$$$) and was wondering if anyone has used Denso ($$) as a replacement? And, oh yeah, I have one broken stud to remove from the head. Any caveats on using the welded nut technique?
However, my short term fuel trim was still high (15 - 20 %) and further investigation revealed a crack in the exhaust manifold/converter at cylinder 4. Apparently a common feature in Civics - interestingly the converter to frame stay was also cracked - leading to me to surmise that the cracked stay allowed excess movement of the manifold leading to the crack. Maybe, maybe not, but I will be inspecting the new (welded) stay on a regular basis. That is, once I get it all back together.
Waiting on a new manifold and hoping to reuse the air/fuel ratio sensor and O2 sensor. They were working fine but will they come out? They look like NGK ($$$$) and was wondering if anyone has used Denso ($$) as a replacement? And, oh yeah, I have one broken stud to remove from the head. Any caveats on using the welded nut technique?
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