The Down Range Forum
Member Section => Down Range Cafe => Topic started by: garand4life on November 03, 2013, 10:19:30 AM
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If anyone here is a mechanic or at least familiar with newer model engines I need some insight.
My 2011 Ford has for the last few months been idling at about 650rpm causing a hard vibration when stopped in any gear (d, R, P, ETC.). I don't know where to go from here other than to go dealer and pay for service out of warranty (85,000 miles). When I went back to NM over the spring and summer I did not have this issue. However last winter I experienced a similar issue. It also seems to drop rpms at times when idling instead of holding a steady idle. Thoughts?
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i would check for an air leak. Unmetered air in modern cars is just as bad as a vaccuum leak with a carb.
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Agree with TAB. Had a similar prob with my Escort. Torn vacuum line, twenty dollar part. Pop the hood and feel up all the vacuum lines.
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If you spray starting fluid around a vacuum leak it should rev up. If it's a pressure leak it won't work.
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THat use to work, but with new cars they can stop thay. i would check from the air box to the throttle body for a small leak, crack or lose hose clamp. Small leaks can cuase issues but not throw up a code.
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Could also be the Mass Air Flow Sensor (MAF), Idle Air Control valve (IAC), Exhaust Gas Recirc Sensor (EGR) or any number of other sensors these new cars are equipped with. They all play a part in instructing the computer to enrich or lean out the fuel mixture, control timing, etc... There are plenty of youtube videos to research for backyard mechanics.
What model Ford?
There are a few licensed mechanics around here. Maybe they'll chime in..
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It's al '11 Focus. The surprising thing is my mileage hasn't been affected and the engine is feeling stronger so I don't know what the hell to think. I just really can't afford an expensive dealership visit. But I'll try using the above when I get a day off. Thanks.
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Check to see if the air box is properly assembled, a leak there can cause symptoms that you described,also check the wires to the Mass airflow and MAP sensor.An other possibility would be to check the gas cap to make sure it's screwed on properly,But that will usually set an check engine light.
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Whatever you find, please let us know as I own the same model and year. A lot less miles on mine though.
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As noted, generally poor idle and engine miss is due to a vacuum leak(s). Eyeball the engine compartment for a hose that popped off a fitting. A grounded spark-plug wire will cause a stumble/miss also.
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It's not missing currently. The weirdest thing is it's basically just idling about 200 rpms below what it would do normally. The intermittently it will suddenly drop 100 rpm or so and come back.
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A dirty throttle-body butterfly will cause that also..... So will the Idle Air Control (IAC).
You might try youtube and search for "idle problems" or such as that.
Today's vehicles are harder to diagnose because the systems are more intricate.....even though the basics are still the same: fuel, air, and spark. It could be anything from a bad plug wire to a bad injector to the fuel pressure regulator.
Here is a link with some things to things to look for.
http://autorepair.about.com/od/enginetroubleshootin1/a/TS_idle-speed.htm
http://www.autozone.com/autozone/repairinfo/common/repairInfoMain.jsp?whereId=39&whereName=Engine&whenId=156&leftNavPage=&whatId=2&symptomName=Erratic+Idle&selectedLinkName=Feels&whenName=Engine+Idling&targetPage=diagnosisBody&diagnosisId=43
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Just a thought, might try changing brands of fuel.
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all fuel is exactly the same until it hits the trucks, so unless your getting bad fuel( water or old) that plays no roll,