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06-20-2010, 11:18 PM
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#1
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Intrepid Modder |
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Join Date: Feb 2005 |
Location:
Hamilton, ON, CA |
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Year: 199x |
Model: Intrepid 3.5L's |
Color: Radiant Red/Chargold |
Posts:
433 |
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Low idle when hot - driving me bananas!
Driving me    !! I replaced the valve cover gaskets today, so I replaced the plugs, wires and swapped out the IAC with another known working one.. I still have a low idle issue when the engine is hot.
In Park/Neutral is idles at 650rpm and in gear it idles at 500, shaking and growing. I cleaned the throttle bodies and now I just don't know what to check. There are no fault codes. Any known issues for first gen 3.5s?
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06-21-2010, 12:39 AM
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#2
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Intrepid Pro |
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Join Date: Aug 2003 |
Location:
long island |
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Year: 1995 |
Model: corde |
Color: spruce |
Posts:
1,701 |
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check pcv valve system also check air filter.Also the throttle position sensor could be dirty.There could also be a vacuum leak
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06-21-2010, 10:06 AM
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#3
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Intrepid Modder |
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Join Date: Feb 2005 |
Location:
Hamilton, ON, CA |
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Year: 199x |
Model: Intrepid 3.5L's |
Color: Radiant Red/Chargold |
Posts:
433 |
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| Quote: |
Originally Posted by stroise
check pcv valve system also check air filter.Also the throttle position sensor could be dirty.There could also be a vacuum leak
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Air filter is good. I don't think there are any vacuum leaks as I just put all the vacuum lines back and the fuel rail o-ring recall was just done, so I know all the seals and gaskets are new from the plenum upwards. I'll recheck. PCV hoses are new, but I'll check the rest. TPS was a thought - I'll clean it or swap it out.
Thanks for the ideas. I think some of which I take for granted are fine. ;) I'll check it out.
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06-21-2010, 04:44 PM
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#4
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Intrepid Pro |
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Join Date: Jun 2003 |
Location:
Maryland |
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Year: 1997 |
Model: Intrepid |
Color: Stone White |
Posts:
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egr valve?
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06-21-2010, 06:18 PM
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#5
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Intrepid Fan |
Join Date: Mar 2005 |
Location:
Kenosha, Wisconsin |
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Year: 1996 |
Model: Intrepid |
Color: Candy Apple Red |
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Don't forget to check the lower intake gasket. Common problem,
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06-22-2010, 09:31 AM
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#6
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Intrepid Modder |
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Join Date: Feb 2005 |
Location:
Hamilton, ON, CA |
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Year: 199x |
Model: Intrepid 3.5L's |
Color: Radiant Red/Chargold |
Posts:
433 |
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| Quote: |
Originally Posted by mass04
egr valve?
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The EGR valve itself works all right. I did have to replace the transducer solenoid though not too long ago as it was leaving fault codes. This issue with low idle has existed since I bought the car and there are no current fault codes.
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06-22-2010, 09:32 AM
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#7
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Intrepid Modder |
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Join Date: Feb 2005 |
Location:
Hamilton, ON, CA |
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Year: 199x |
Model: Intrepid 3.5L's |
Color: Radiant Red/Chargold |
Posts:
433 |
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| Quote: |
Originally Posted by Rams
Don't forget to check the lower intake gasket. Common problem,
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Could it be though? Usually an intake leak causes a fluctuation in rpm, not a steady low idle. I can check it anyway just to be sure.
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06-23-2010, 12:24 AM
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#8
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Intrepid Pro |
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Join Date: Apr 2008 |
Location:
georgia |
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Year: 2004 |
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the intake gasket would cause a high-idle IIRC
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06-23-2010, 12:54 PM
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#9
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Intrepid Pro |
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Join Date: Jun 2003 |
Location:
Maryland |
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Year: 1997 |
Model: Intrepid |
Color: Stone White |
Posts:
1,341 |
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| Quote: |
Originally Posted by gearhead291
the intake gasket would cause a high-idle IIRC
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Not necessarily, the IAC will continuously adjust for it making it fluctuate
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10-03-2010, 03:36 PM
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#10
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Intrepid Modder |
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Join Date: Feb 2005 |
Location:
Hamilton, ON, CA |
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Year: 199x |
Model: Intrepid 3.5L's |
Color: Radiant Red/Chargold |
Posts:
433 |
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It's pretty much fixed.
I couldn't find any reason for the low idle when hot, other than the throttle body adjustments. I noticed on the throttle bodies, someone has removed the plugs for the adjustment, so I figure some moron along the way was fudging around with it. So it's adjusted and idles at about 575rpm in gear now, which is a huge improvement. Next spring I will refine it more. The car is parked now for the winter.
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10-03-2010, 11:36 PM
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#11
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1st Gen FTW - It's AutoMedic! |
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Join Date: Jun 2008 |
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Garrison, ND |
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Year: 1994 |
Model: Intrepid ESi |
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15,412 |
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Parked for the winter?
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Low idle when hot - driving me bananas!
