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Discussion Starter · #1 ·
Hey everyone,

I recently had a serpentine belt, radiator hoses, and trans cooler hoses to the radiator put on. When I got it back the idle was/is high. Running about 800 to 900 rpms sitting in drive. In neutral or park it knocks back and feels like it normally did but doesn't drop much as far as rpm's.

I can get to about 15 mph just idling. It also now walks itself up slight hills that before it would barely hold itself or drift back some. Down-shifting seems rough as well.

You know how when you drag race you put your left foot on the brake to hold it back while you lean on the gas? That's how I feel just driving normal with my foot he brake, like it just wants to bust out and go. That may be a common sense description, I'm just trying to be as descriptive as possible.

Could a new belt make the idle go up that much? I have a 2005 SE crew, this is the first time I changed the belt. I read the threads about the IAC (Idle Air Control Valve) but nothing has been done I that area of the truck. If it wasn't down-shifting weird, I may not care as much.

Any ideas or thoughts would be greatly appreciated!

Thank you!
 

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Vacuum leak
 
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Did you ever resolve the high idle issue? I cleaned my throttle body and MAF only to make mine worse (900 rpms went up to 1100 rpms). I replaced my throttle body and MAF and now back down to 900. I did the throttle relearn upon the installation, 3 times now and 800 rpms is the best I can get. My 2004 Titan has over 220K miles and was running like a champ until now. I can't imagine a vacuum leak causing high idle as from my experience leaks generally cause low, rough idle. Any bit of info from your experience would help me. Thanks
 

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Discussion Starter · #5 ·
Did you ever resolve the high idle issue? I cleaned my throttle body and MAF only to make mine worse (900 rpms went up to 1100 rpms). I replaced my throttle body and MAF and now back down to 900. I did the throttle relearn upon the installation, 3 times now and 800 rpms is the best I can get. My 2004 Titan has over 220K miles and was running like a champ until now. I can't imagine a vacuum leak causing high idle as from my experience leaks generally cause low, rough idle. Any bit of info from your experience would help me. Thanks
Hey man, I took it back to the shop and they refused to believe the idle would be so low from the factory. I told them it wasn't right so they plugged in their diagnostic reader (or whatever it's called) and reset my computer. When they reset it, it was reading the normal idle RPM's on their reader but the truck was still idling high - the tach showed it as well. He ran it twice for me with the same results. He also said it may take some time for the computer in the truck to actually take hold of the re-program and settle back to normal. I left and drove a mile or two, got to a stop sign and sure enough it dropped back to normal. Hope this helps some.
 

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Thank you for your response. After a month, I finally figured mine out yesterday! Woo Hoo! My sending unit on my power steering pump is either bad or my power steering is going out. I bought a cheep sending unit on Amazon to test my theory, plugged in the new unit (but did not install in pressure line). Idle immediately went down to around 650 in gear. Drove it for a while, then reprogrammed throttle position and it dropped down to about 550 in gear and 750 in neutral. It's been a while since it's been back to near original levels. With the new throttle body and MAF I hope I get my gas mileage back (horrible as it was before, still better than the past month). It doesn't seem that I need the sensor for keeping idle up during tight parking maneuvers, so for now I'll just keep driving it and see what happens. No low pressure code as of yet (fingers crossed).
 
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