2004 Dodge Ram 1500 Idles High

Idles High

Dodge Engine jerks into gear

Q: 2004 Dodge Ram 1500 QC SLT 4.7L automatic engine with 165,000 miles. My idle continues to fluctuate. When I come to a quick stop the engine continues to idle high. While take off  truck moves slow for a few feet then jerks into gear. Also, in park or drive it sometimes jerks into gear.

A: It is most likely  throttle position sensor (TPS) issue. 

For 2004 Dodge Ram model truck The TPS is mounted on the left side of the throttle body and tells the engine and trans controllers how far the throttle is open.

Why Such Problem Occurs:

When the sensor gets worn it will start to create small voltage spikes in it's signal and the engine controller things you are opening the throttle, so the idle can be erratic. If the voltage just stays high then so will the idle.

The trans controller also receives the TPS signal and uses it for shifting control. If the idle fluctuation and the trans symptoms started at about the same time then the TPS is likely causing the shifting issues too.

Monitoring TPS Signal:

The TPS signal can be monitored with a scan tool or lab scope. You can also try unplugging it while the idle is fluctuating, if it straightens up then replace the sensor. You can also tap on the sensor or wiggle the connector, if this has any effect on the engine then replace the sensor.

This will help.

Thanks.

Car Engine Stalls While Driving?

Engine stalling is many a times caused by faulty TPS sensor.TPS means throttle position sensor.So first inspect Throttle sensor. If the Throttle Position senor is checked ok,then IAC valve needs to be inspected.
The IAC [idle control motor] may be sticking. This problem usually occurs once the car exceeds 80,000 miles in service. Remove the IAC and clean it's interior with carburetor cleaner. Reinstall it using a new gasket. Sometimes, cleaning will not suffice & a new IAC must be installed. But if problem remains same then EGR valve has to be inspected.A sticking or leaking EGR [exhaust gas recirculation] valve can cause the same problem.

This basic details will help.Thanks.

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