Hesitation with hard acceleration
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Senior User
Joined: May 2008
Posts: 121
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From: South, AR
Hesitation with hard acceleration
Hi guys, I've been having an issue with my 06 sputtering when I accelerate hard getting on interstate or passing. I replaced my fuel filter and that helped a little bit but it is still doing it. While parked I can rev the engine and I hear what seems to be marbles rattling in the muffler area. My CEL came on the other day and the code is PO442 small evap leak. Do I need a new muffler or what???? Truck runs fine until I really get in the gas. Thanks for any input. Oh by the way I love this freaking site, solved my problem with 4x4 system thru this website!!!
Elder User
Joined: Dec 2007
Posts: 680
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From: Michigan
I hope someone answers. I'm having a similar issue with my 04! 140K. Did the same thing, replaced my fuel filter, added some lucas trans fix. I'm just hoping it's not the tranny. Seems to slip.
As to your code, Evap leak has to do with the carbon canister and fuel system not the muffler. Make sure your gas cap is on and tight. Turn until it clicks. Maybe a weld broke on a partition in the muffler. Good excuse to get something a little more free flowing.. Sorry, didn't answer your question..
As to your code, Evap leak has to do with the carbon canister and fuel system not the muffler. Make sure your gas cap is on and tight. Turn until it clicks. Maybe a weld broke on a partition in the muffler. Good excuse to get something a little more free flowing.. Sorry, didn't answer your question..
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Senior User
Joined: May 2008
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From: South, AR
Yeah I've had this code pretty much since I got my truck. It's become my little annoying friend. Pretty sure I've got an exhaust leak around the muffler but don't know why I would have this much sputtering when accelerating hard. I think I'm gonna replace stock muffler with magnaflow muffler just not sure which size I need or want. I don't want a lot of rumbling noise, just a little (enough to let someone know when I'm passing LOL).
Sick 'n Tired
Joined: May 2006
Posts: 2,969
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From: League City, TX
OK, could be a bad COP or plug (or both) with the hesitation on hard accel symptom. However, the rattling noise is not a good sign. It could be that the bad COP, Plug or stuck injector has killed a cat and that rattling sound is your catalyst which has fractured into a hundred pieces due to having been melted by the fuel blow by. Run the codes again and make sure you're not getting cat insufficiency codes P0420 or P0430.
Just went though this with my Expy '06 5.4L. If you take it in make sure they thoroughly inspect and TEST the injectors. My dealer went in circles with COPs, plugs and Cats (through 3 BRAND new ones) before isolating the stuck injector. $2600 later it's fixed...thank god for the extended warranty.
Just went though this with my Expy '06 5.4L. If you take it in make sure they thoroughly inspect and TEST the injectors. My dealer went in circles with COPs, plugs and Cats (through 3 BRAND new ones) before isolating the stuck injector. $2600 later it's fixed...thank god for the extended warranty.
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Senior User
Joined: May 2008
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From: South, AR
Well not getting any of those codes Bridge just the PO442, I've started thinking about the injectors also. Ran some injector cleaner and opened her up and wow no sputtering or hesitation!! Took it to a muffler shop and couldn't hear the rattle in muffler area when reving up, however did find a rattle inside heat sheild on cat (gravel). Hopefully it is just injectors, that will be an easy and fairly cheap fix especially if this cleaning solvent did the trick. In my 01' gmc I took each injector out and cleaned by hand may end up doing that with this truck. I've heard I can get all new injectors for $100 -150 off ebay.
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Joined: Feb 2006
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Hi guys, I've been having an issue with my 06 sputtering when I accelerate hard getting on interstate or passing. I replaced my fuel filter and that helped a little bit but it is still doing it. While parked I can rev the engine and I hear what seems to be marbles rattling in the muffler area. My CEL came on the other day and the code is PO442 small evap leak. Do I need a new muffler or what???? Truck runs fine until I really get in the gas. Thanks for any input. Oh by the way I love this freaking site, solved my problem with 4x4 system thru this website!!!
Thread Starter
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Senior User
Joined: May 2008
Posts: 121
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From: South, AR
Well that is sure what it sounds like. Every once in a while it will act up when trying to crank it. Like it half cranks and dies. I let it sit and it will then fire right up. I'll tell ya this, if it is a fuel pump they make these better than the ones in gmc's. I had a 2001 gmc 5.3L and went thru 5 in two months and when these act up they kill the dam engine on spot. It got to the point that I cut a patch out of the bed to easily access the fuel pump in the tank. Like you said normal driving it's fine but wot it bucks and jumps like hell no I ain't gonna do it!!! What did a new one cost ya if you don't mind me asking? Dealership do it?
New User
Joined: Feb 2006
Posts: 13
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Well that is sure what it sounds like. Every once in a while it will act up when trying to crank it. Like it half cranks and dies. I let it sit and it will then fire right up. I'll tell ya this, if it is a fuel pump they make these better than the ones in gmc's. I had a 2001 gmc 5.3L and went thru 5 in two months and when these act up they kill the dam engine on spot. It got to the point that I cut a patch out of the bed to easily access the fuel pump in the tank. Like you said normal driving it's fine but wot it bucks and jumps like hell no I ain't gonna do it!!! What did a new one cost ya if you don't mind me asking? Dealership do it?
New User
Joined: Nov 2009
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it would pull a p0171 like my truck did which means a oxygen sensor detected to much oxygen in the the exhaust...which can be caused by a dirty/faulty MAF, or a vacuum leak..which can cause those symptoms lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.
