Codes 131, 151. 171, 174, 300, 756

[Marv02]

At first I was getting codes 131, 171, 174, I changed out the right O2 put a New MAF in and new Intake manifold gasket.

The New MAF helped it had no power it fixed that then it still threw the 171 and 174 codes I replaced the intake manifold gasket about 8 months ago so.

I changed out intake gasket again this morning it ran great for 130 miles or so but on the way back home it started acting up again threw codes again limp it home had no power nothing bottom end as long as keeping it at 55 MPH was very hard to do it dropped down to 35 climbing hills to get home.

About the last 20 miles or so it was able to pick up some speed but still no bottom end power.

I have low Fuel Pressure 32 LB's I know I should be around 50 to 60 LB's could this be my problem.

Any idea what is causing this.

 

[SLCHOE]

At first I was getting codes 131, 171, 174, I changed out the right O2 put a New MAF in and new Intake manifold gasket.

The New MAF helped it had no power it fixed that then it still threw the 171 and 174 codes I replaced the intake manifold gasket about 8 months ago so.

I changed out intake gasket again this morning it ran great for 130 miles or so but on the way back home it started acting up again threw codes again limp it home had no power nothing bottom end as long as keeping it at 55 MPH was very hard to do it dropped down to 35 climbing hills to get home.

About the last 20 miles or so it was able to pick up some speed but still no bottom end power.

I have low Fuel Pressure 32 LB's I know I should be around 50 to 60 LB's could this be my problem.

Any idea what is causing this.

Yes.

---------- Post added at 09:10 PM ---------- Previous post was at 09:10 PM ----------

Its the fuel pump.

 

[Marv02]

I should gone with my Gut feelings on this from the Get go it was the Fuel pump.

I wasted about $200.00 and hours of my time Chasing everything else others said was my issues from other sources.

If you throw these codes and it runs good idles smooth but no power check you're fuel pressure if low change the fuel filter But I knew my was new it is the fuel pump.

BUT my AC Delco E bay $30.00 fuel pump I put in about 3 months ago went bad new don't mean it good.

This time I went with a Auto Zone AC Delco complete new fuel pump assembly with a lifetime warranty for $245.00

 

[SLCHOE]

For the record, all of the stuff that is AC Delco on Amazon is legit. Most of the time cheaper than the parts stores also. I order AC Delco stuff on Amazon all the time (run a shop) as well as Toyota and Nissan OEM stuff. Always in OEM packaging and never had ay issues.