Engine & Performance High Engine Idle
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1999 Ram, 5.9L, auto, 4x4
I just replaced the IAC valve on my ...
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01-11-2012, 12:00 PM
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#1 (permalink)
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Junior Member
Join Date: Jan 2012
Posts: 10
Ram Year: 99
Engine: v8
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High Engine Idle
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1999 Ram, 5.9L, auto, 4x4
I just replaced the IAC valve on my truck 'cause it wouldn't idle and figured the IAC was bad as per OBD scan. Now the truck idles at 1800 rpm and I can't get it to idle down to normal. I did the proper IAC adjustment which calls for driving at 40 mph to allow ECM to learn the setting, but that didn't work.
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Last edited by camoman214; 02-21-2012 at 12:59 AM.
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01-11-2012, 12:10 PM
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#2 (permalink)
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Senior Member
Join Date: Aug 2011
Location: Lancaster, TX / Winchester, VA
Name: Rick
Age: 44
Posts: 485
Ram Year: 2001
Engine: 5.9L CTD 24v 6 hole Bolt-action
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verify your TPS setting is correct.
Also, ensure your throttle cable isn't hanging on something, or improperly adjusted.
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__________________
'01 QCSB 5.9L Cummins - 6speed, Edge Juice w/Attitude, BHAF, 5" Diamond Eye TBE
'96 SCLB 5.9L Cummins - #10, BHAF, 4" DP, 7" Miter Stack, Leveler, 4500, M275s, Jake
'03 QCSB 4.7 2WD - all original, 98k mi., dual exhaust - My late father's truck. RIP, pops! 4/11/36 - 3/26/11
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01-11-2012, 12:13 PM
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#3 (permalink)
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Junior Member
Join Date: Jan 2012
Posts: 10
Ram Year: 99
Engine: v8
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What should the proper setting?
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Last edited by camoman214; 02-21-2012 at 12:57 AM.
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01-11-2012, 12:38 PM
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#4 (permalink)
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Senior Member
Join Date: Aug 2011
Location: Lancaster, TX / Winchester, VA
Name: Rick
Age: 44
Posts: 485
Ram Year: 2001
Engine: 5.9L CTD 24v 6 hole Bolt-action
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I just checked, and the TPS on the 5.9 is not slotted, therefore, not adjustable. Sorry for the confusion..
If you have, or know someone with a good scanner, they should be able to connect it to the OBD port, and see if the TPS voltage is within spec at idle (I believe it's around .9VDC)
Another thing to check is vacuum lines; ensure you have no leaks anywhere. A vacuum leak can cause a high-idle issue, as well.
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__________________
'01 QCSB 5.9L Cummins - 6speed, Edge Juice w/Attitude, BHAF, 5" Diamond Eye TBE
'96 SCLB 5.9L Cummins - #10, BHAF, 4" DP, 7" Miter Stack, Leveler, 4500, M275s, Jake
'03 QCSB 4.7 2WD - all original, 98k mi., dual exhaust - My late father's truck. RIP, pops! 4/11/36 - 3/26/11
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01-11-2012, 01:31 PM
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#5 (permalink)
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Junior Member
Join Date: Jan 2012
Posts: 10
Ram Year: 99
Engine: v8
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Awesome, thanks. I have a scan tool at home, so I will get a voltage reading tonight.
For reference, approximately what is the (IAT) temperature supposed to be at idle after the truck is warmed up?
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01-11-2012, 01:37 PM
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#6 (permalink)
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Senior Member
Join Date: Aug 2011
Location: Lancaster, TX / Winchester, VA
Name: Rick
Age: 44
Posts: 485
Ram Year: 2001
Engine: 5.9L CTD 24v 6 hole Bolt-action
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The IAT reading will depend on how hot the intake air is.. I don't have a resistance/voltage scale on the IAT handy. I'd say temp-wise, at operating temperature, +40*F over ambient.
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__________________
'01 QCSB 5.9L Cummins - 6speed, Edge Juice w/Attitude, BHAF, 5" Diamond Eye TBE
'96 SCLB 5.9L Cummins - #10, BHAF, 4" DP, 7" Miter Stack, Leveler, 4500, M275s, Jake
'03 QCSB 4.7 2WD - all original, 98k mi., dual exhaust - My late father's truck. RIP, pops! 4/11/36 - 3/26/11
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01-13-2012, 12:02 PM
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#7 (permalink)
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Junior Member
Join Date: Jan 2012
Posts: 10
Ram Year: 99
Engine: v8
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Hey Rogan68, thanks a lot for the reply. TPS was it.
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Last edited by camoman214; 02-21-2012 at 12:57 AM.
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01-13-2012, 12:32 PM
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#8 (permalink)
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Senior Member
Join Date: Aug 2011
Location: Lancaster, TX / Winchester, VA
Name: Rick
Age: 44
Posts: 485
Ram Year: 2001
Engine: 5.9L CTD 24v 6 hole Bolt-action
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Awesome! Happy motoring!
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__________________
'01 QCSB 5.9L Cummins - 6speed, Edge Juice w/Attitude, BHAF, 5" Diamond Eye TBE
'96 SCLB 5.9L Cummins - #10, BHAF, 4" DP, 7" Miter Stack, Leveler, 4500, M275s, Jake
'03 QCSB 4.7 2WD - all original, 98k mi., dual exhaust - My late father's truck. RIP, pops! 4/11/36 - 3/26/11
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01-13-2012, 10:22 PM
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#9 (permalink)
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Junior Member
Join Date: Jan 2012
Posts: 10
Ram Year: 99
Engine: v8
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Well I guess I spoke too soon. After replacing the TPS sensor and driving the truck last night, the truck ran fine and idled normal. Today, I started it up and now it's idling high again, just as it was before.
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01-13-2012, 10:52 PM
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#10 (permalink)
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Senior Member
Join Date: Aug 2011
Location: Lancaster, TX / Winchester, VA
Name: Rick
Age: 44
Posts: 485
Ram Year: 2001
Engine: 5.9L CTD 24v 6 hole Bolt-action
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Try reseating the tis connector
per Tapatalk on my EVO
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__________________
'01 QCSB 5.9L Cummins - 6speed, Edge Juice w/Attitude, BHAF, 5" Diamond Eye TBE
'96 SCLB 5.9L Cummins - #10, BHAF, 4" DP, 7" Miter Stack, Leveler, 4500, M275s, Jake
'03 QCSB 4.7 2WD - all original, 98k mi., dual exhaust - My late father's truck. RIP, pops! 4/11/36 - 3/26/11
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