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Hi all, need some help.
I have a 2008 Honda Civic LX AT with 150k miles on it. I cleaned the throttle body with someone pressing on the gas to open the throttle plate. I used a shop towel soaked in throttle body cleaner and wiped out all the carbon trying not to touch the throttle plate.
After I’m done I tried the idle learn by disconnect battery for 10 mins and then key on for 2 seconds and 3000rpms till fan comes on then idle for 5 mins.
It’s still idling high @ 1,200 RPMs. and doesn’t drive too smooth. Got CEL and code P0507
Does anybody have any suggestions? I would hate to bring to dealer and spend $100-$200 for them to just program my car.
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I happen to have the service manual for your car since I also have the same car as you and I Looked up our code and got this:
Check for vacuum leaks at these parts;
• PCV valve
• PCV hose
• EVAP canister purge valve • Throttle body
• Intake manifold
• Brake booster hose
• Brake boosterAlso mentioned is to check wiring/terminals to the throttle body.
There is a lot of info in the manual but most of it we can’t do without the Honda specific scan tool.
It could also be IACV. Check to make sure a hose or connector didn’t get dislodged during the cleaning.
Relearn Procedure:
1.Make sure all electrical items (the A/C, the audio system, the lights, etc.) are off.
2.Reset the ECM/PCM with the HDS.
3.Turn the ignition switch to ON (II), and wait 2 seconds.
4.Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, or until the engine coolant temperature reaches 194 °F (90 °C).
5.Let the engine idle for about 5 minutes with the throttle fully closed.
NOTE: If the radiator fan comes on, do not include its running time in the 5 minutes.
If you moved the throttle plate, the learn is likely lost. The above is directly from Honda. That doesn’t mean it definitely is, but in most cases one goes with the other. A check over of the hose is a good idea first.
The p0507 code is just the computer saying the idle is too high. Thanks PGM-FI, tell us something we didn’t know.
I think this guy hit the nail on the head. I’m going to bring by a local shop to see if they can calibrate Throttle Plate:
ok so to everyone who has this problem i want to stop the insanity of hearing people replacing good throttle bodies and some saying the dealer has to reflash your pcm.. in some cases if you man handle your throttle body you could damage it but jeez im sure you guys are being careful RIGHT? So that being said im a tech and have been in the automotive trade over 25 years doing electrical diagnosis and tune up so when i cleaned my throttle body and my car started acting this way i naturally needed to find out why… first thing i did was a idle relean which did nothing n i did it 4 times..so i hooked up the scanner and looked at all my pid’s n low and behold the tp sensors were not agreeing so i went into special functions on the scanner and did a tps calibration..fired it up and idle went down to 750 perrrrrrrffffffect…the rev hang was gone or back to normal cause as all of us know these 8th gens do that on factory tune.. unfortunately this action has to be done by the use of a scanner and no it doesn’t have to be a hds from honda it could be any good scanner with bi directional controls a $100 scanner from the parts store wont work…so if you clean your throttle and notice your idle stays at 900 rpm and when you come to a rolling stop in neutral your rpms shoot up to 2500 rpm till you come to a complete stop or you use your front window defrost and throw a p0507 “idle higher than expected” all these problems are caused by the same problem “TPS CALIBRATION” to all of you that went to honda and they couldn’t address this problem its a shame cause they should know this..Now i know people are saying the car fixed itself after driving it a couple months or whatever but really can you drive you car with it bucking along while trying to find a parking spot or going to a drive through and you guys that have this know what i mean..it will fix itself after a while but it will take a long time for the pcm to learn all the values needed..hope this sheds some light guys…peace.
What scanner did you use? I have the same car as you and would like to have that scanner in case I need in the future.
Thanks.
[quote=”twiggy02919″ post=137688]What scanner did you use? I have the same car as you and would like to have that scanner in case I need in the future.
Thanks.[/quote]
I used a simple Actron scanner to pull the P0507 code. But I think I might have to go to Honda to re calibrate the throttle plate position sensor
Any modern independent shop should have the equipment to do it. If they can’t get it done, don’t pay.
UPDATE:
I took my car to a local shop that had a bi-directional scan tool and within 10 mins FIXED. I brought along paperwork from forums regarding the throttle position calibration, he read it and went out to the car, hooked up the OBD and bamm, DONE. Now I idle at 700 RPMs and everything is the way it used to be. He didn’t even charge me…..
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