jonnywhoop52

I have a 4.8 and after all the cold weather in Ohio over the last few weeks my fuel pressure regulator broke and dumped 3/4 of a tank (36 gallon tank) within 3 miles all over the head. After replacing the regulator the motor idles like complete garbage. Everything is fine as far as compression, leak down, or oil consumption, and the vacuum line on top of the regulator is ok. I need some ideas on where to go from here. This is my daily driver and no performance mods have been done to it.

MustangPunk

iTrader: (1)

You're sure the vacuum lines aren't bad and creating a vac leak. Have you tested the fuel pressure since changing the regulator?

jonnywhoop52

I haven't been able to check since I don't have a gauge. I replaced the coils that got fuel dumped on them and it helped a little but I noticed when I moved the regulator back and forth it got a little bit better but it still isn't right. Lines seem to be ok, but I can't say with 100% certainty they aren't cracked somewhere small.

Atomic

iTrader: (42)

try unplugging the battery for a couple minutes then plug it back in to reset the trims and stuff.

xx_ED_xx

iTrader: (17)

some auto parts store rent a gauge

jonnywhoop52

Got a gauge a few days ago, and when I tested fuel pressure I had 55 psi as soon as the key was turned on, then it bled right off to around 10 psi.

custm2500

iTrader: (10)

Sounds like a bad regulator or you messed up one of the O-rings

jonnywhoop52

I didn't change the regulator myself and it's 20 degrees outside so I really don't feel like pulling it back apart, but it seems like that's where I'm at, at this point.

chevrolet all the way

iTrader: (24)

If you have to drive it daily you might want to feel like getting in that cold! Its a quick job to take apart and see the issue. Did you rev it or anything to see the change on the gauge?

jonnywhoop52

No all I did was turn the key and from what I saw it was suppose to keep pressure. Should I just replace it after I take it off and how far in is that o-ring? I just don't like having to spend another $80 if all I need is an o-ring. Could it be a fuel filter plugging up. Because I did an injector clean before the regulator popped, so I'm wondering if some of the cleaning stuff got through the return?