# Mitsubishi montero...  Won't idle when warmed up.. eh?

**URL:** <https://forums.speedlife.net/t/mitsubishi-montero-wont-idle-when-warmed-up-eh/63422>\
**Category:** NYSpeed Automotive\
**Created:** [February 21, 2009, 2:14pm UTC](https://forums.speedlife.net/t/mitsubishi-montero-wont-idle-when-warmed-up-eh/63422 "2009-02-21T14:14:31Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![redZ](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/redz/32/7492_2.png) [@redZ](https://forums.speedlife.net/u/redZ)\
**Post date:** [February 21, 2009, 2:14pm UTC](https://forums.speedlife.net/t/mitsubishi-montero-wont-idle-when-warmed-up-eh/63422/1 "2009-02-21T14:14:31Z")

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So i’m having trouble diagnosing a problem im having. When cold, my truck will start , idle and drive fine. When it warms up it won’t idle. RPMs drop to 0 and it dies. If i try to restart, it will start strong, but tghen rpms go back go 0 and it dies. I don’t know a thing about these cars and everything is ridiculously expensive. I’m thinking maybe Idle air control valve? It’s $180 though… so i don’t want to make guesses.

No SES light… However im thinking i will go get it scanned anyway.

Anyone have any other ideas?

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**Author:** ![psychopjv](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/psychopjv/32/7251_2.png) [@psychopjv](https://forums.speedlife.net/u/psychopjv)\
**Post date:** [February 22, 2009, 10:21am UTC](https://forums.speedlife.net/t/mitsubishi-montero-wont-idle-when-warmed-up-eh/63422/2 "2009-02-22T10:21:21Z")

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def sound slike a vac leak/ unmetered air problem. best way without a scanner is to spray carb cleaner around while it’s actually running. when the idle drops, you found your hole.

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**Author:** ![redZ](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/redz/32/7492_2.png) [@redZ](https://forums.speedlife.net/u/redZ)\
**Post date:** [February 24, 2009, 9:11am UTC](https://forums.speedlife.net/t/mitsubishi-montero-wont-idle-when-warmed-up-eh/63422/3 "2009-02-24T09:11:39Z")

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I  
ll have to try that after work today.

Definitely not a fuel problem right? I’m assuming a fuel problem would cause problems whether the engine was warm or cold, or in open loop or closed loop

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**Author:** ![psychopjv](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/psychopjv/32/7251_2.png) [@psychopjv](https://forums.speedlife.net/u/psychopjv)\
**Post date:** [February 24, 2009, 2:46pm UTC](https://forums.speedlife.net/t/mitsubishi-montero-wont-idle-when-warmed-up-eh/63422/4 "2009-02-24T14:46:59Z")

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Never know could be a fueling issue. Check the fuel pressure. A semi plugged filter causing backpressure could in theory work well after it sat and bled pressure off and then like crap after it build pressure once again.