P0089 Code

[Big_Mel]

So after changing my batteries my 02 started throwing codes P0088 and P0089. Just replaced the fuel pressure regulator and not getting the p0088 code but just the P0089. Considering the p0089 is regulator performance what is my next step?? I have efi live and LDS over stock injectors, FASS Fuel pump.

 

[2004LB7]

What pressure are you running on the LP?

 

[Big_Mel]

What pressure are you running on the LP?

Not sure?? Didn't know there is aadjustment. Just installed it and never looked back. Been on for a couple years now.

 

[2004LB7]

That code is common with lift pumps putting out too much pressure and the regulator can't pull the pressure down enough so the ECM thinks the regulator is bad. It can also be from a tune written for a modified regulator and a stock regulator was used. Or, an actual bad regulator that is sticking

 

[Ron Nielson]

Maybe some information in the attachment will help. Probably don't need to read further than page 3

 

[Big_Mel]

So got it to not throw any codes. Just rough to start and idles rough then smooths out....

 

[2004LB7]

And....

 

[Big_Mel]

Still Starts hard. Runs extremely rough for about a min of time. Then it runs fine. Runs fine down the road. Then idle kindof off. No lights...

 

[2004LB7]

Can you log fuel pressure?

 

[Big_Mel]

Maybe. Im not sure with my reader. My buddy owns a shop so I know his snapon can. What am I looking for??

 

[gmduramax]

Desired and actual fuel pressure. Main injection rate