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Discussion Starter #1
Guys,
Every couple hundred miles I've been getting the diagnostic code "P0507 Idle Air Control System RPM Higher Than Expected"
pop up with the "Service Engine Soon" on the dash. Anyone had this issue or now what it means? My truck is a 2008.5 with
about 132,000 miles on it. Please advise. Thanks!
 

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Discussion Starter #2
Anyone have any idea or similar issue before?
 

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I would start small check air filter if that's OK, then I would move on to see if the mass air flow sensor is clean. I've previously seen vehicles (my wife's traverse and others) having the rpms bounce a little at idle and throttle body cleaner does the trick. The wife's, I have to do every 3-6 months, it really needs a ketch can, but I haven't got around to it (piece of crap Chevy, they know there's a problem and will do nothing). DON'T use the throttle body cleaner on the MAF, it is very sensitive, I think there is a proper cleaner for it. Good luck I hope this helps.
 

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Discussion Starter #4
I would start small check air filter if that's OK, then I would move on to see if the mass air flow sensor is clean. I've previously seen vehicles (my wife's traverse and others) having the rpms bounce a little at idle and throttle body cleaner does the trick. The wife's, I have to do every 3-6 months, it really needs a ketch can, but I haven't got around to it (piece of crap Chevy, they know there's a problem and will do nothing). DON'T use the throttle body cleaner on the MAF, it is very sensitive, I think there is a proper cleaner for it. Good luck I hope this helps.
Thanks Smccarty,
I will definitely try that. I just changed the air filter about 500 miles ago after having a K&N in there for the last 100,000. With what you've said above, I'm thinking the oil residue may have gummed up the MAF and the throttle body.........especially with 131,000 miles on the rig! Will definitely check it out. THANKS AGAIN!!!
 

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Discussion Starter #5 (Edited)
OK, new air filter, cleaned MAF sensor well, removed air box/tube assembly and fully cleaned the throttle body
with TB cleaner and a clean rag, then ran the Nissan idle relearn steps. Truck is getting an additional 2-3 mpg
(17-18mpg at 70mph vs previous 14-16mpg!!), HOWEVER, the damn thing idles like crap between 930-1100 RPM,
depending whether it's a cold(first thing in the AM) start, or a warmed(2nd time in day) use...........CONFUSED!!!

Would disconnecting the battery overnight reset the computer to relearn, as sort of a reboot?
Since I have a BullyDog Triple Dog programmer, would it help to push a new upload with a fresh programming?
 

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If that's your only code: Check PCV function (rattle=OK). If OK, then do a gasket test on all gaskets from the throttle body to the intake. If OK, then you start examining all vacuum hoses/connections.
 
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