03 silverado 1500?

[fish2live]

first i do not drive this truck very often only go through a tank of gas a month at the most. last weekend we were heading up north in it and i got a check engine light but, no other symptoms so i just cleared the code once i got up north and figured it was o2 sensors. we made it up north fine and the next day went to start and it started fine but killed twice at low rpms and low speed. i put some injector cleaner in it thinking it might be dirty injectors and drove it home about 120 miles, drove fine just had a little ruff idle when rpms were down. today i changed the o2 sensors thinking this was part of it. when i start it up now it idles fine but if i rev the engine and let settle it wants to kill drops down to about 300 rpms shimies a little then recovers. there is also a noticable hessitation in the fuel pedal not all the time but some times. could this be bad gas? dirty injectors? dirty intake mannifold? what are your thoughts. thanks steve

[fish2live]

forgot it has the 5.3 in it

[jwhjr]

Did you get what the codes were before you cleared them and has it tripped any codes since?

[fish2live]

no after i cleared it i thought about that. no no new codes since. i forgot to mention it has 63000 miles on it.

[Willow Sticks]

Have you considered fuel filters? my 2002 acted similar and filters took care of it.

[fish2live]

i did a fuel filter about a year ago. i could give it a shot and see what happens. you put filters is there more than just the one inline because if there is i haven't changed them.

[Jeremy airjer W]

I would bet that the code(s) where lean bank 1 and lean bank 2. Both of these together is the key to the puzzle. If only one of them was present than I would be more inclined to lean towards an 02 going bad. Since there together the likely culprit is the intake plenum gasket is leaking, essentially a vacuum leak. The ruff run at idle is another symptom of this problem. To properly diagnose this one a shop would use a smoker to confirm the presence of the vacuum leak at the gaskets.

These are becoming a common problem and start to show up more as the temps cool down.

[fish2live]

i will bring it in and have it looked at. what am i looking at for labor ona intakeif it happens to be it?

[morefishplease]

Could be the fuel pressure regulator??

[Jeremy airjer W]

The classic symptom for a fuel pressure regulator is an extended crank after a hot soak (drive for at least 20 minutes, shut it off, let sit for 10-15 minutes, then try to start).

[Jeremy airjer W]

Off the top of my head I think they pay around 2 hours. The gaskets will run you around $100.

[fish2live]

it doesn't have a problem starting even with a little wait just hard time at idle when reved up. i will let you know if it is the gasket when i get it looked at.

[ottertailguy]

My 05 had a bad coil so that's my guess but the thing to do is just bring it in. It could be a number of things and you want to replace the right part.

[Jeremy airjer W]

If a coil was bad the PCM would likely pick up the misfire and flash the check engine light.

[putter]

i would also say vacuum leak. i change my fuel filter every 5,000 on mine i get my filters cheap so its no big deal but you would be surprized how mutch restriction is in that filter after 5000 miles. i feel it helps the fuel pump alot

[fish2live]

well my machanic took a look at it and ended up being a dirty maf sensor so he cleaned it and that took care of the ruff idle. the check engine light he said is from a vaccume leak from somesort of valve back by the fuel tank he says another bad design. when i pick the truck up i will ask what the name of the valve was.

[Scott K]

Probably a canister vent solenoid.

[Jeremy airjer W]

Didn't see that one coming!