Question about 2005 Jeep Wrangler

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When I first start my Jeep each day, I have to let it warm up or it hestitates. It's like it's not getting getting gas. Occasionally, it even stalls. That problem only lasts for the first few minutes that it's running. It's been going on for 3 years because everytime someone looks at it they can't figure it out. Sometimes at a stoplight it will buck forward, like I gave it gas even when I'm holding down the brakes. Again, that's only when I first start driving. After a few minutes it's fine.

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  • Jeep Master
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It is running lean during cold start mode when the fuel is vaporizing fast enough to keep the engine running.

Either your cold start system is not operating, or your Mass Air Flow Sensor is coated with varnish and needs to be cleaned with carb cleaner. Your engine coolant temp sensor tells your engine computer what the temo of the engine is. The computer then tells the fuel injectors how much fuel to inject. When engine is cold, it injects more fuel to keep the engine running. So, it may be the coolant temp sensor. Autozone can run a computer scan for free and tell you what the fault codes are. However, if the coolant sensor fails to always reading warm engine, the scan may not get a fault code for that.
A coolant sensor should be about $75, cheaper on ebay. Report back on codes and progress.

Posted on Jun 03, 2009

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