Note: I thought I sent this out days ago, but it turned up in my drafts folder this morning. Sorry for the delay!
This requires some detective work. Typically this situation is caused by a poor fuel-air mixture, which has a number of potential causes. There are several factors that could be implicated: o The cold engine is getting too much air. Possible vacuum leak; possible stuck idle air control valve in throttle body. o The cold engine is getting poor sensor data. Possible throttle position sensor issue, also (remotely) possible O2 sensor issue First thing to do is to check for trouble codes in the PCM. You can use the key on-off-on-off-on method to see if any trouble codes blink out via the check engine light. If you get something other than codes 12 and 55, report them back here and it will help us to diagnose it. If you don't have trouble codes, check for vacuum leaks using an unlit propane blowtorch. Pass the nozzle of the torch around the areas where the intake manifold mates to the top of the engine. Also check over any vacuum lines you find, including the ones that lead to the evap charcoal cannister. Make sure the fuel cap is secure. Also check the condition of the throttle body. Is the butterfly gummed up, causing it to stick partly open? If you see a lot of soot and varnish, there's a good chance the idle air control motor is gummed up and sticking. You'll have to remove the throttle body and clean it thoroughly using Gumout and q-tips. Clean the idle air passage especially well. Avoid getting the solvent on the throttle position sensor. You can check the operation of the O2 sensor using a digital voltmeter. Acceptable values are usually between 0 and 1v; when the engine warms up it will cycle between those two values. An excellent description of O2 sensor operation can be found at http://www.mr2.com/TEXT/O2_Sensor.html. On 11/2/06, John Walston < [EMAIL PROTECTED]> wrote: > > Greetings from Birmingham, AL. I have a '96 Concorde with a 3.3L > engine and 110K miles. I am experiencing the same problem Steve > posted about in October, 2005. When the engine is cold, it idles > rough and the check engine and cruise lights blink when I come to a > stop. I have to put the car in neutral and give it gas or it will > die. This only happens until the car is warm. Then it runs fine. > > I couldn't see a post stating what the resolution to the problem was. > Goeff, if you're still in this group, you were also involved in the > conversation. Please advise if anyone has any ideas. I have recently > replaced the camshaft position sensor. This is my wife's car, so I > want to be sure it's safe. > > Thanks in advance for your suggestions. > John > Birmingham, AL > '96 Chrysler Concorde > '02 Chrysler 300M -- --Geoff MML Moderator/Admin/Website Admin/Map Keeper '92 Acclaim; '98 Intrepid; '03 Grand Caravan http://www.moparmailinglist.com Gizmo Project (Free VOIP): ggariepy68 [Non-text portions of this message have been removed] Web: <http://groups.yahoo.com/group/dodge_intrepid> Subscribe: <mailto://[EMAIL PROTECTED]> Unsubscribe: <mailto://[EMAIL PROTECTED]> Moderator: <mailto://[EMAIL PROTECTED]> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dodge_intrepid/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dodge_intrepid/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
