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Discussion Starter #1
Ok, this is my first post but I just got back from oklahoma buying an 04 lly. I floored it earler and it won't shift up to the next gear now! I have tried a few different times. What the heck is wrong with it? Lemon? I need some help soon! Thanks!

also, it is'nt throwing a code. Completely stock with 115k on it. It also continues to drive normally as long as it is'nt floored.
 

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You read the codes with a code reader? Sometimes there are hidden codes. Also, maybe the fuel filter? Sometimes they will fall flat at full throttle when the filter is dirty, and then drive normally otherwise. I would suggest starting there.
 

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Discussion Starter #3
are there 2 fuel filters like a powerstroke or just one? Is there a resource on here such as a tutorial for the change? Also, do people use aftermarket fuel filters or just order from gm?

no i didn't use a code reader.
 

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Pop the hood. Make sure that your air intake tube is plugged in. If it is, change out your fuel filter ASAP.

This sounds like you threw a 1093, fuel starvation code. This can happen without the engine light on and it wont go over 2000 rpms.
 

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One fuel filter, DIY section for the change.
 

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Discussion Starter #6
and fuel filter from gm? how much?
 

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I have used both. Probably about $50 from GM. Can get them quite a bit cheaper from the vendors here.
 

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Discussion Starter #9
who else has the fuel filters?
 

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I also got one from the dealer, $27 , good deal, I used to get them from O'reilys and they were like $38 .
 

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Discussion Starter #11
sounds good, is there anything else I'll need or should do at the same time as this? thanks for all the help!
 

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nothing you really need to do but, with 115k it might be time for some fluid changes, coolant, trans, etc. If they havent been done yet.
 

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Discussion Starter #13
ya, not sure when done last, what fluids are you guys switching to or just running gm?
 

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When u floored it how fast were you going. Over 75 mph and it won't downshift.
 

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Discussion Starter #15
no it did it at like 10, 20, 40, 50, basically every time I tried it. But I still drove it 75mph to work today! I have no clue what it is.
 
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