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High idle, pretty stumped


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Ok all, I made mention to this in the GD topic but I think it's about time to make a ...


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Old 09-24-2017, 06:04 PM   #1 (permalink)
 
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Default High idle, pretty stumped
Ok all, I made mention to this in the GD topic but I think it's about time to make a thread because this issue is starting to irritate me.

Starting about three weeks back, every once in a great while when I shift the tranny into Park, the engine idles up to 1,000 RPM and holds. It drops and rises during this time like the ECU is trying to pull it down but is not succeeding. So, I decided to replace the IAC, which I suspect was faulty anyway due to unresolved cold-start stalling issues last winter. The engine started and idled no problemo, so I decided to rev it. Lo and behold, the engine did not return to it's normal idle of 650 RPM, but instead stuck at friggin' 1,000 RPM again. I revved the engine a little and nothing changed so I revved the engine to 3,000 RPM and what do you know, it returned to proper idle.

So, I spent the next little while revving the engine to see if the issue would happen again. And it did but there was no predicting when it would. It was totally random when the engine would return to a high idle rather than a normal idle.

Earlier this year, I fiddled with the idle screw on my modified throttle body and had no problems with the setting until now. So, I reversed what I did and the issue was improved but the engine still wanted to high idle on occasion. Went for a drive earlier today and when I stopped at the station, the idle was fine. When I got home, however, the engine high-idled again!

This issue has me totally stumped. New IAC, fiddled with the throttle body and the problem as of now remains unresolved. Starting to bug me. What do y'all think? Vacuum leak? Electrical bug? I've got my old throttle body in a box somewhere. If I can find it, I might try putting it back on and see if that does anything if I can't figure this out.

If it could possibly make a difference, this problem started about one week after I got my shorties installed.


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1999 Dodge Ram 1500 4x4 SLT Laramie
The only true screw-up is one that can't be reversed!
American Racing Nitro, K&N open element, modified 50mm, eBay shorties, 2.25" y-pipe, Magnaflow cat, Cherry Bomb Extreme, DUI LiveWires/cap/rotor, canned 91 tune by Flyin' Ryan, Hughes plenum repair, 4x4 Posi-Lok, on-board Money Sink 3000
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Old 09-24-2017, 08:51 PM   #2 (permalink)
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The engine cant rev if its not getting enough air, something is causing it to open the IAC to hold that RPM, which it will do on cold start for a few seconds until things warm up. A vacuum leak unless its huge (like pulling the brake booster) will not affect the idle much at all. If it only happened after shorty headers then I would suspect something to do with what the O2 sensors are reporting and how your tune is deciding to act. Do you have a scantool that will read O2 info and fuel system information? I'd be checking to see if its going open loop when this is happening, and what the O2 sensors are outputting. I'd also be curious to see what the engine temp is reporting via the scantool.

I doubt its anything with the intake, especially since its intermittent its gotta be the computer reacting to a sensor reading somewhere. You might also try the APPS reset procedure and see what the TPS readings are.
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Old 09-24-2017, 09:05 PM   #3 (permalink)
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^+1, Yes I would definitely look at the o2's, might need to get a couple non foulers.
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Old 09-24-2017, 09:11 PM   #4 (permalink)
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You guys have helped me lots getting my 3 1996 trucks running, I,m thinking. The iac you got isn,t good. Hard to say.
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Old 09-24-2017, 11:43 PM   #5 (permalink)
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I literally cleaned my TB because of my IAC getting stuck open. Turns out there was 122k miles worth of grime built up in there and you could see the lines where the IAC would rest open and closed.


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Old 09-25-2017, 05:14 PM   #6 (permalink)
 
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Thanks for the input, guys. I've got an Innova scanner with live data function, so I'll check things out next time I get a chance.


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The only true screw-up is one that can't be reversed!
American Racing Nitro, K&N open element, modified 50mm, eBay shorties, 2.25" y-pipe, Magnaflow cat, Cherry Bomb Extreme, DUI LiveWires/cap/rotor, canned 91 tune by Flyin' Ryan, Hughes plenum repair, 4x4 Posi-Lok, on-board Money Sink 3000
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Old 09-26-2017, 07:27 AM   #7 (permalink)
 
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These may help

screenshot_20170909-232748.jpg
screenshot_20170909-232815.jpg
screenshot_20170909-232822.jpg
screenshot_20170909-232830.jpg
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Old 09-27-2017, 09:02 AM   #8 (permalink)
 
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Just tried that adjustment procedure. Ended up turning the screw back in at least a few whole turns. Couldn't get as precise as 200 above command (which would have been 850). It was either settle on ~750 or the engine would rev up and hang on to 1,200. Seems to be okay now but I'll drive the truck for a few days before I come to any conclusions.


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The only true screw-up is one that can't be reversed!
American Racing Nitro, K&N open element, modified 50mm, eBay shorties, 2.25" y-pipe, Magnaflow cat, Cherry Bomb Extreme, DUI LiveWires/cap/rotor, canned 91 tune by Flyin' Ryan, Hughes plenum repair, 4x4 Posi-Lok, on-board Money Sink 3000
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Old 09-27-2017, 03:15 PM   #9 (permalink)
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I am not understanding this, what did you adjust?
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Old 09-27-2017, 03:19 PM   #10 (permalink)
 
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Where'd you get the throttle body from?
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