High idle on 99 Durango when warm

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High idle on 99 Durango when warm - 11/10/2007 11:24:01 AM    eddieg5150   Posts: 8 Joined: 11/10/2007 Status: offline Hello, I have a high idle problem on my 99 Durango 5.2litre.  It is returning a P0505 error, I have replaced the IAC and the TPS, I have removed and cleaned the throtlle body but the check engine light is still on.  It seems to idle fine untill it warms up, then the idle will shoot up to about 2000 RPM.  The only part on the throttle body I have not replaced is the MAP sensor, at a $110 I would like to know if it would be the next step or if there is anything else I can look at.  I would like to add that it does not idle high all of the time, sometimes it runs and idles perfectly, but the check engine light remains on all the time.  All and any help is greatly appreciated.  Thanks! Post #: 1

RE: High idle on 99 Durango when warm - 11/10/2007 5:40:12 PM    berger21   Posts: 7 Joined: 9/29/2007 Status: offline I have the same issue on my 99 with the 5.9L engine. I have cleaned the battery terminals, replaced the plugs, wires, vacuum hoses, PCV valve, IAC and TPS. I have also cleaned the throttle body and put on a new throttle body gasket. I also get the P0505 code. I'm not sure what to look at next. It runs at 700-750 RPM when cold and then moves up to 1,000-1,000 RPM as it warms up. Anyone? (in reply to eddieg5150) Post #: 2

RE: High idle on 99 Durango when warm - 11/10/2007 6:56:44 PM    Sixtysixdeuce   Posts: 468 Joined: 11/5/2007 Status: offline 505 indicates an IAC driver circuit is shorted to ground or one of the other drivers.  This can be a defective IAC (obviously not for either of you), a problem in the wiring harness or at the PCM connector.  Only thing to do now is test circuits and find out which driver is shorted to what.  I would carefully inspect the exposed wires and loom to make sure none of them have rubbed through to gound or each other.  If you don't find anything (without actually tearing apart the whole loom, provided it appears in good condition), start probing. _____________________________ Thank god Ford is still making vehicles, because mechanics still have bills to pay. (in reply to berger21) Post #: 3

RE: High idle on 99 Durango when warm - 11/11/2007 7:29:22 AM    eddieg5150   Posts: 8 Joined: 11/10/2007 Status: offline Thank you very much for the information.  I will check the wiring today and post results.  Is it easier to simply replace the harness or is that not an option?  (in reply to Sixtysixdeuce) Post #: 4

RE: High idle on 99 Durango when warm - 11/12/2007 4:26:43 AM    berger21   Posts: 7 Joined: 9/29/2007 Status: offline I don't see anything obvious. If I take a voltmeter, do you know what the readings should be for each lead? (in reply to Sixtysixdeuce) Post #: 5

RE: High idle on 99 Durango when warm - 11/12/2007 8:44:26 AM    eddieg5150   Posts: 8 Joined: 11/10/2007 Status: offline I checked all the wiring yesterday and could not seem to find any problems, they all seem in tact and working properly.  What is strange is that it runs great with normal idle most of the time and it is only after it warms up that the idle will stay high.  Could it be a vacum leak or a oxygen sensor?  I was going to replace the PCM, but it seems that it would fail all of the time and not just some of the time.  I might take it to our local shop this week as I am out of answers.  Thanks for the help and if anyone has any suggestions they would most certainly be appreciated. (in reply to berger21) Post #: 6

RE: High idle on 99 Durango when warm - 11/13/2007 5:57:15 AM    Chris_Gorham   Posts: 73 Joined: 2/1/2006 Status: offline Try replacing the crankshaft speed sensor that can sometimes ground itself...after that its the PCM...Chris (in reply to eddieg5150) Post #: 7

RE: High idle on 99 Durango when warm - 11/13/2007 11:22:01 AM    eddieg5150   Posts: 8 Joined: 11/10/2007 Status: offline Thanks Chris, I will try that.  I am trying to hold out on the PCM, I found one for $250 and almost purchased it, but would like to get the less expensive stuff out of the way first.  I'll keep you posted.  (in reply to Chris_Gorham) Post #: 8

RE: High idle on 99 Durango when warm - 11/17/2007 3:55:15 PM    eddieg5150   Posts: 8 Joined: 11/10/2007 Status: offline I replaced the crankshaft position sensor today and it did not fix the problem....so I guess it's either take it to the shop or replace the PCM which is a real easy job.  I'm just not sure if I should spend the $250 for the PCM or try our mechanic.  It seems that only when the D warms up it starts to idle very high, somewhere in between 1500 and 2000 r's.  Any other suggestions would be appreciated as I have tried all the easy stuff and am now thinking I should maybe leave it to the experts. (in reply to eddieg5150) Post #: 9

RE: High idle on 99 Durango when warm - 11/23/2007 1:22:44 PM    berger21   Posts: 7 Joined: 9/29/2007 Status: offline Well I took mine in for a diagnostic. It cost me $110. They say it is definitely the PCM. Any recomendations for aftermarket ones to replace it with? < Message edited by berger21 -- 11/23/2007 1:40:47 PM > (in reply to eddieg5150) Post #: 10

RE: High idle on 99 Durango when warm - 12/4/2007 2:36:29 PM    eddieg5150   Posts: 8 Joined: 11/10/2007 Status: offline I replaced the PCM and the problem appears to be fixed.  Thanks for the all the help! (in reply to berger21) Post #: 11

RE: High idle on 99 Durango when warm - 12/6/2007 1:29:57 PM    berger21   Posts: 7 Joined: 9/29/2007 Status: offline Where did you get yours and how much? I've not replaced mine yet. (in reply to eddieg5150) Post #: 12

RE: High idle on 99 Durango when warm - 12/6/2007 8:41:43 PM    eddieg5150   Posts: 8 Joined: 11/10/2007 Status: offline Ebay...Auto Computer Exchange.  It was $249 plus shipping...well worth it and they were excellent to deal with and easy to install.  http://cgi.ebay.com/ebaymotors/98-02-DODGE-DURANGO-Rebuilt-Engine-Computer-ECM-PCM_W0QQcmdZViewItemQQcategoryZ33596QQihZ002QQitemZ120191660959QQrdZ1QQsspagenameZWDVW (in reply to berger21) Post #: 13

RE: High idle on 99 Durango when warm - 12/7/2007 8:08:43 AM    Mean Green Posts: 3187 Joined: 6/22/2006 From: Reno, NV Status: offline Were they able to flash your VIN and mileage onto it or did you have to take it to the dealer? _____________________________ 2000 Durango 5.9L SLT+ Flowmaster 40 "Custom" Ram Air 31" BFG AT T/A KO's Bilstein Shocks Hidden Hitch Sirius Satelite Radio E-fan conversion Smittybilt brushguard SSU's (in reply to eddieg5150) Post #: 14

RE: High idle on 99 Durango when warm - 12/7/2007 8:57:51 AM    eddieg5150   Posts: 8 Joined: 11/10/2007 Status: offline They (Auto Computer Exchange) did everything and shipped ready to install, no trips to the dealer.  Great company to work with and the software on the PCM was the latest from Mopar.  (in reply to Mean Green) Post #: 15

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