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P0740, Low Idle, and other issues

  #11  
Old 05-02-2013, 12:37 PM
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Repaired the connection between PGM and ECM. Easy fix.

Spent a few hours last night making the throttle body and IACV look polished. No luck. Still low idle. So I adjusted the idle screw until way farther than I think should have been necessary to get the idle where it's supposed to be. It was fine when I ran the AC for the required minute, but I hit the brake pedal on accident and all hell broke loose (not really). When I would release the brake, the idle would rise to around 1k, and then bog out. No stall, just bog out and then return to where it was.

Adjusted it back down slowly until the bogging stopped, and it's too low again. FML. Here's a video of what it's doing
Don't know if you can tell, but the idle rise happens when I LET OFF the brake.

There is also intake backfire (not in video) that has been there from the beginning. So I'm thinking:
1) CAI causing too much air, not enough fuel, although there should be something automatically correcting this. Not sure what it is.
2) Something with the fuel delivery.
3) The fact that I'm still missing 1 muffler. As said before, there is only an open exhaust on one side of the Y-pipe.

I am out of troubleshooting ideas. PLEASE HELP!
Thanks!
 
  #12  
Old 05-02-2013, 08:28 PM
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I just realized we're talking about a V6. I'm not sure it even has an IACV. My only V6 is an 03 Acura MDX w/ 3.5L V6. It indicates a idle re-learn is required any time ECM is reset.

Suggest downloading a manual for your vehicle from automanualsource.com for $21.99. This will have details for trouble shooting and idle relearn for your vehicle.

good luck
 
  #13  
Old 05-03-2013, 12:07 AM
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It has one, and I have one. Was also thinking about doing an EGR cleaning as well, but intake backfire means too much air right? Hence I'm thinking a fuel issue.

The idle relearn procedure is just let it idle for a while right?
 
  #14  
Old 05-03-2013, 06:14 PM
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No there are several steps in the shop manual. May be different for 99 V6, hence shop manual suggestion.

good luck
 
  #15  
Old 05-03-2013, 08:40 PM
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I'll look for the procedure, but I didn't see anything other than disconnecting battery for 10min and then idling for a while.
 
  #16  
Old 05-07-2013, 02:34 PM
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Should there be ANY gap between the throttle body plate and the housing when the throttle is closed? When I try to set base idle (disconnect IACV w/ warm engine, no load), the rpms bounce at 1k. I have sprayed throttle body cleaner EVERYWHERE on the engine and hoses to check for vacuum leaks.
 
  #17  
Old 05-07-2013, 06:27 PM
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No, however throttle plate and AT throttle cables should begin to move at same time.

Have you adjusted throttle stop screw? It is not supposed to be adjusted.

good luck
 
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