Question about 1998 Ford Expedition

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Miss at 1500 rpms

My truck has a miss to it at around 1500 rpms. It will go down to 1200 rpms and back up to 1500 rpms. And than it will go up 1800 rpms and than back down to 1500 rpms.

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  • kevin carpenter May 11, 2010

    is the check engine light on?

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  • 26 Answers

May have vacume leak some where.

Posted on Jan 01, 2009

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At 1200 RPMs my engine wants to die. At 1500 and up runs fine.


I would suggest a specific order, first, check for vacuum leaks especially at the PCV and the hoses connecting. Then clean the Mass Air Flow sensor, after these easy things it gets more difficult with the plug connectors, plugs and coils.

Sep 12, 2014 | 2004 Ford F150

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Small oil leak front of engine looks like coming out of sencer


If you mean the sending unit, clean the area around it first. Then run the engine at between 1500 to 1800 rpms for about 5 minutes. That should tell you whether or not you do have seepage from the sending unit.

Sep 25, 2010 | 2005 Ford Focus

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Start car and the idle goes to 3000 rpm, holds there for around 12 seconds or so and then comes down to around 1200. when driving if stopped and you put the car in park or nuetral the idle will go up to...


it sounds like a vacuum leak to me, my car had the same problem but when i changed the hose that connected the valve cover to the fuel injectors the rpms dropped back down to about 800 rpms

Sep 17, 2010 | 1999 Saturn SL

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Brakes pullin


power brake truck rpms should be around 1800 if not bad tourqe converter in transmission

May 25, 2009 | 1996 Dodge Ram

1 Answer

Engine revving problem


Sounds like your idle speed is way too high, should be somewhere around 800-1200 rpms. I would check for vacuum leaks.

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1 Answer

Around 1500 rpms or 55 mph engine seems to bog down


It sounds like your low on fluid, or your transmission filter is dirty and the front pump is not getting enough oil supply. Worst is your front pump is going bad. 
Check the fluid level and see if it's burnt. Good luck

Apr 06, 2009 | 2003 GMC Envoy

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