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2004 Silverado 5.3 Ls 1500

seabeebu87

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seabeebu87 New Member

seabeebu87

Posted
Posted

I have a weird problem. When I bought the truck 6 months ago I noticed that the exhaust sounded weak coming out from my passengers side. After getting a P0300 code I ran the scanner and noticed all my O2 sensors were reading good so opted that out. I went and cleand My MAF sensor, regrounded my battery with 0 gauge to make sure it was a good connection :), and got a new battery. I also cleaned my throttle body, replaced all my spark plugs and wires(Ac DELCO). I only have 115,000 on the truck. It has true dual exhaust with 2 flowmaster 40's. I tried the sea foam last week and swapped all the spark plugs out, and noticed a dramatic change for about a day and than back to normal. Every time I go to start the truck it usually takes 2-3 turns of the key to get it started, and when it starts it sounds awful for 2 seconds but idles and sounds fine after that.

 

When I mash the gas all the way down it does well until I hit about 50 MPH than I hear a ping and low piched back fire coming from the passenger side only. I can increase my speed past 50 but won't go over 60. I have ordered a new fuel rail and fuel injectors, to go with that I have ordered a fuel pressure regulator as well. I noticed my vacume lines were leaking yesterday and best guess is that it's the FPR. Does anyone know the exact location of the Fuel pressure regulator? I know the process on how to depressurize the system, but just need to know the exact location so I don't have to look for it for 30 minutes lol. Also when I start it up it smells like straight gas. Also the P0300 code is always on, and when I clear it it comes back on after 100 ft of driving. Any other information would be greatly appreciated. Thanks :mad:

txab Senior Enthusiast

txab

Posted
Posted

IIRC, on an '04 the FPR is part of the fuel pump, in the tank. Check your fuel pressure for starters, key on, engine off reading. Your pump may be going bad. Also check for leaks at the intake gaskets

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