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2005 Dodge Ram 1500 SLT 2dr Reg Cab 120.5 WB

2005 Dodge Ram 1500
Trim Info:
Rear Wheel Drive, Reg Cab 6.3' Bed
14 mpg city / 19 mpg hwy
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April 8, 2013, 3:56 pm

Jack R
 

Question: i have a dodge ram 1500 4.7 2005 the RPM raving in idle

i have dodge ram 1500 4.7 2005 the RPM raving when in idle


April 13, 2013, 10:00 am

Ron W
Expert Mechanic

Sounds like a lean condition. This could be caused by poor engine running (needs a tune up), a vacuum leak in the intake somewhere, or a sensor sending poor information causing the computer to make the car run lean. Make sure the basic tune up items are done first. If they are you ned to look for the other possible causes.

It’s possible that your MAF (Mass air flow sensor) may be contaminated. If it gets dirt or oil (from and over oiled K&N type filter), it will misread the amount of air coming into the engine. Usually it reads too little air because of the contamination. What happens is the PCM (Powertrain Control Module) reduces the injector on time (leans out the mixture) to compensate for the reduce air flow. What the driver experiences is surging.
You'll need a scan tool to clear the codes. This will reset the adaptives and reset the MIL light.

They sell at most parts stores Air Flow Meter cleaner (about $8 bucks). You just pull the sensor out, spray it off, air dry it, and reinstall. This can help, but usually is a temporary fix, and the sensor will eventually have to be replaced. If you try this, be sure not to touch the sensor except a it's connector as it is fairly fragile.


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