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!997 C3500 No power great idle


veprk130

Question

Posted

I just recently encountered a problem with my truck:

 

1997 C3500 CrewCab dually 7.4 vortec

 

One day is was running then the next it was not.

 

Engine has a hard start on cold, but when warm it idles evenly at 1000rpm.

Once I push the gas pedal it just bogs down with no power at all.

 

Here are the codes I found:

 

P0131 - O2 Sensor Circuit Low Voltage (bank 1 sensor 1)

P0150 - O2 Sensor Circuit Malfunction (bank 2 sensor 1)

P0151 - O2 Sensor Circuit Low Voltage (bank 2 sensor 1)

P0171 - System Too Lean (bank 1)

P0174 - System Too Lean (bank 2)

 

Any ideas would help. I was thinking replacing the 2 from O2 sensors.

 

Ruben

0 answers to this question

Recommended Posts

Posted

Well thanks for the tip, but it did not work.

 

I replaced the following:

 

TPS - was broken

MAP

Idle control air value

 

Still runs the same.

Posted

Thanks to everyone and their responses.

 

It turns out it was the fuel sending unit. One of the tubes was loose and the base

of the connection. Once replaced all is good.

 

Ruben

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