Fuel Pressure dropping, attempting to diagnose and fix my truck

[mjm-1957]

Check for a restricted exhaust system.Pull the front oxygen sensors out and try it.

[GavinKBarnes]

5 hours ago, swathdiver said:

And the fuel pressure is holding during this at the commanded rate?  

 

Can your scan tool check and test the transmission and torque converter?  

No, it's not that fancy. Unfortunately closest mechanic is 25 minutes away and I don't have the means to tow my truck currently lol. But if I can't figure it out soon I'm probably just gonna have to find a way to drop it at a mechanic, because this is just frustrating. 

[GavinKBarnes]

4 hours ago, mjm-1957 said:

Check for a restricted exhaust system.Pull the front oxygen sensors out and try it.

I'll try that today, and get back with you on if there is any improvements

[sefiroxx]

Agreed, check exhaust. Cats may have clogged up (running hot, too much fuel).

[GavinKBarnes]

4 hours ago, GavinKBarnes said:

I'll try that today, and get back with you on if there is any improvements

 

22 minutes ago, sefiroxx said:

Agreed, check exhaust. Cats may have clogged up (running hot, too much fuel).

Won't be able to get it today, thought I had the right socket to get them off but I don't, so I'll have to pick one up this week. I'll keep y'all posted

[swathdiver]

1 hour ago, GavinKBarnes said:

 

Won't be able to get it today, thought I had the right socket to get them off but I don't, so I'll have to pick one up this week. I'll keep y'all posted

7/8" or 22mm.  It should have thrown codes for a bad cat if they were plugged but stranger things have happened.

[GavinKBarnes]

3 hours ago, swathdiver said:

7/8" or 22mm.  It should have thrown codes for a bad cat if they were plugged but stranger things have happened.

9 hours ago, GavinKBarnes said:

I'll try that today, and get back with you on if there is any improvements

 

5 hours ago, sefiroxx said:

Agreed, check exhaust. Cats may have clogged up (running hot, too much fuel).

Got a 7/8" deepwell from a buddy, got my o2 on my PS off, truck Revs and runs, albeit no faster than 35, but I imagine that's because there's still restrictions with only one hole open. Gonna have to cut the cats off and replace them, thank you all so much for helping me figure this out. If anybody has a link to some decently priced cats for my truck I would greatly appreciate it. 

[sefiroxx]

Rockauto direct for 310+.

Also, be sure to do research and correct fuel trim as you don't want melt the new one

[swathdiver]

4 hours ago, GavinKBarnes said:

 

Got a 7/8" deepwell from a buddy, got my o2 on my PS off, truck Revs and runs, albeit no faster than 35, but I imagine that's because there's still restrictions with only one hole open. Gonna have to cut the cats off and replace them, thank you all so much for helping me figure this out. If anybody has a link to some decently priced cats for my truck I would greatly appreciate it. 

Don't be so quick to call it cats, if they are plugged a code should have been thrown for them.

 

If you are certain, well, be sure to buy good ones, not Chicom garbage that won't last a year.  I replaced my entire Y-pipe and cats with Magnaflow's system.  #51578 for my truck.  

 

Then go buy a Tech-2 (which are not Chicom garbage) to save yourself the aggravation of trying to diagnose these computerized vehicles next time.  It will quickly pay for itself.

[Paintor]

Fuel looks fine.

 

Take a multimeter and Ohm out all your coil packs. Are they all reading the same resistance?

 

If there are no vacuum leaks I am going with a crank sensor. 

 

Did you recently break up with a girl and potentially have something like sugar in your fuel tank?...gotta ask.

[GavinKBarnes]

6 hours ago, sefiroxx said:

Rockauto direct for 310+.

Also, be sure to do research and correct fuel trim as you don't want melt the new one

 

6 hours ago, swathdiver said:

Don't be so quick to call it cats, if they are plugged a code should have been thrown for them.

 

If you are certain, well, be sure to buy good ones, not Chicom garbage that won't last a year.  I replaced my entire Y-pipe and cats with Magnaflow's system.  #51578 for my truck.  

 

Then go buy a Tech-2 (which are not Chicom garbage) to save yourself the aggravation of trying to diagnose these computerized vehicles next time.  It will quickly pay for itself.

Thanks for the suggestions, and I will be getting a Tech-2 ASAP. I definitely don't want to deal with this all over again.