engine surging?

dusted800 · 03-12-2007, 10:07 AM

91 C1500 with 305. Engine will run fine but at idle it will start to die a little and then catch it self and rev up a little. It almost sounds like an old carbuerated engine that loads up a little. It will continue to do this as long as it is idling. There is no engine light on. I have checked for codes and there is none. Can anyone give me a place to start or a sensor that is possibly doing this. thanx. wnk.

junior3382 · 03-12-2007, 10:16 AM

the Throttle position sensor (TPS) or map sensors.

dusted800 · 03-12-2007, 03:50 PM

Also meant to say that when you start it up for the first time it doesn't start the surging for approx 3-5 minutes. When it starts, it is on high idle and will run for a few minutes just fine, then the idle comes down to normal and it will run a few more minutes and then it will start surging. thanx. wnk.

junior3382 · 03-12-2007, 04:25 PM

Sounds like it runs fine until it warms up. When it warms up, the air fuel mixture is off. I would look at the o2 sensor or even the egr valve...

03-12-2007, 10:07 AM	#1
dusted800 Junior Member Join Date: Mar 2007 Posts: 3	engine surging? 91 C1500 with 305. Engine will run fine but at idle it will start to die a little and then catch it self and rev up a little. It almost sounds like an old carbuerated engine that loads up a little. It will continue to do this as long as it is idling. There is no engine light on. I have checked for codes and there is none. Can anyone give me a place to start or a sensor that is possibly doing this. thanx. wnk.

03-12-2007, 10:16 AM	#2
junior3382 Senior Member Join Date: Mar 2007 Location: Currently, I live in Lancaster county, Pennsylvania. Posts: 3,040	the Throttle position sensor (TPS) or map sensors. __________________ *Parts have been found, tools are collecting, tensions are rising, the weather is changing...look out.... the SAS is comming!*

03-12-2007, 04:25 PM	#4
junior3382 Senior Member Join Date: Mar 2007 Location: Currently, I live in Lancaster county, Pennsylvania. Posts: 3,040	Sounds like it runs fine until it warms up. When it warms up, the air fuel mixture is off. I would look at the o2 sensor or even the egr valve... __________________ *Parts have been found, tools are collecting, tensions are rising, the weather is changing...look out.... the SAS is comming!*

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03-12-2007, 03:50 PM	#3
dusted800 Junior Member Join Date: Mar 2007 Posts: 3	Also meant to say that when you start it up for the first time it doesn't start the surging for approx 3-5 minutes. When it starts, it is on high idle and will run for a few minutes just fine, then the idle comes down to normal and it will run a few more minutes and then it will start surging. thanx. wnk.