OhareFred Posted November 23, 2018 Report Share Posted November 23, 2018 Hey all. The particulars: 09 , v6 3.5, about 88,500 miles The issues: rough idle when in gear with foot on brake, mpg is about 12 [usually get 14 around town in the winter] on occasion it will die after backing down the driveway and shifting into drive, but only when cold. Once it warms up once it won’t die until next day. NO ENGINE LIGHT. SO FAR: cleaned my K&N air filter (really wasn’t dirty but cleaned it anyway), cleaned the throttle body [wasnt really dirty but cleaned it anyway]. At about 85k the dealer replaced the intake manifold and changed the plugs for a similar issue, but that issue threw the check engine light. I’m taking it in Monday and leaving it for a 4 wheel alignment [new rubber] and so that they can check it out cold, but was curious what you all think. I’m thinking it could be anything from a weak coil to a slipped timing belt. Yes, this engine has a belt that needs replacement every 100k miles. I know no one can diagnose the problem online, but maybe someone had a similar situation and can point me to what they did to fix it. Thoughts? Thanks! Quote Link to comment Share on other sites More sharing options...
2late4u Posted November 23, 2018 Report Share Posted November 23, 2018 what about the map sensor,.............. What common symptoms indicate you may need to replace the Manifold Absolute Pressure Sensor (MAP Sensor)? Erratic or rough idling Delay in acceleration or deceleration Check Engine light is on Excess exhaust emissions resulting in failed emissions test OhareFred 1 Quote Link to comment Share on other sites More sharing options...
OhareFred Posted November 23, 2018 Author Report Share Posted November 23, 2018 Thought about the map but no engine light triggered..wouldn’t the map trigger a mil if it was bad? Not sure... Quote Link to comment Share on other sites More sharing options...
Summer Solstice Posted November 23, 2018 Report Share Posted November 23, 2018 A vacuum leak could cause that problem. A leak around the intake manifold would do it. The installation of the new manifold may have developed a problem or a vacuum hose, related to he previous work or not, may have a leak. 2late4u, OhareFred and larryl 1 2 Quote Link to comment Share on other sites More sharing options...
2late4u Posted November 23, 2018 Report Share Posted November 23, 2018 14 hours ago, OhareFred said: Thought about the map but no engine light triggered..wouldn’t the map trigger a mil if it was bad? Not sure... wouldnt hurt to clean it,have watched a you tube on it not hard.. OhareFred 1 Quote Link to comment Share on other sites More sharing options...
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