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Old 03-04-2011, 11:28 AM
bcampbe7 bcampbe7 is offline
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2004 GMC Yukon 5.3L issues

2004 GMC Yukon XL with the 5.3L Flex Fuel. 105k miles (or so).

Yukon started having an issue on Wednesday. My wife drove about 20 miles from work to her parentís house to pick something up. She got back into the vehicle a few minutes later, started it and when she accelerated the vehicle sputtered. No power what-so-ever but would idle just fine. After a mile or so, it was fine. It was low on fuel, so she thought maybe that was it. Filled it up and everything seemed OK. Same thing happened yesterday. This time the issue didnít go away. She ended up making it home (barely) and parked the Yukon in the garage. I got home maybe 45 minutes later. The Yukon fired right up and drove like it never had an issue.

Any idea what would cause this? I am changing the fuel filter because that has never been done. Thinking it may be a clogged catalytic converter, but not sure if these symptoms portray that. Like I said, when I got home it was running fine.

Any ideas?
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Old 03-04-2011, 11:30 AM
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I'd guess fuel filter. That's a lot of miles on a filter
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Old 03-04-2011, 11:40 AM
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Yep fule filter.
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Old 03-04-2011, 11:42 AM
bcampbe7 bcampbe7 is offline
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Quote:
Originally Posted by flipper View Post
I'd guess fuel filter. That's a lot of miles on a filter
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Originally Posted by KnoxX2 View Post
Yep fule filter.
Yeah, hoping it is just the fuel filter. I couldn't get the dang pressure fitting off (even bought the tool to do so). A mechanic that lives down the street from me is coming over this evening to help.
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Old 03-04-2011, 12:10 PM
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Cut it
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Old 03-04-2011, 01:03 PM
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Now you have a full tank of fuel to deal with when you put the fuel pump in it.
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Old 03-04-2011, 02:06 PM
bcampbe7 bcampbe7 is offline
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Now you have a full tank of fuel to deal with when you put the fuel pump in it.
Yeah, I hope it is not the pump. If it is, I will not be doing the work myself.
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Old 03-04-2011, 02:31 PM
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Quote:
Originally Posted by bcampbe7 View Post
2004 GMC Yukon XL with the 5.3L Flex Fuel. 105k miles (or so).

Yukon started having an issue on Wednesday. My wife drove about 20 miles from work to her parent’s house to pick something up. She got back into the vehicle a few minutes later, started it and when she accelerated the vehicle sputtered. No power what-so-ever but would idle just fine. After a mile or so, it was fine. It was low on fuel, so she thought maybe that was it. Filled it up and everything seemed OK. Same thing happened yesterday. This time the issue didn’t go away. She ended up making it home (barely) and parked the Yukon in the garage. I got home maybe 45 minutes later. The Yukon fired right up and drove like it never had an issue.

Any idea what would cause this? I am changing the fuel filter because that has never been done. Thinking it may be a clogged catalytic converter, but not sure if these symptoms portray that. Like I said, when I got home it was running fine.

Any ideas?
Check the pressure and scan it for codes- you know the drill.
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Old 03-04-2011, 02:54 PM
bcampbe7 bcampbe7 is offline
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Originally Posted by JimN View Post
Check the pressure and scan it for codes- you know the drill.
Yeah, planning on checking fuel pressure and pre-cat exhaust pressure this evening. From what I have read, fuel pressure should be 55 psi and exhaust pressure should be no more tha like 2 lbs. Does that sound correct?

No MIL, but will check for codes too just to be sure.

Spoke to a muffler shop and he said if it was the Cat it would not go away. He thinks it is the fuel pump. I just thought if it was the fuel pump it would also be a go out and not come back type of thing. We shall see.
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Last edited by bcampbe7; 03-04-2011 at 02:57 PM.
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Old 03-04-2011, 02:57 PM
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Originally Posted by bcampbe7 View Post
Yeah, planning on checking fuel pressure and pre-cat exhaust pressure this evening. From what I have read, fuel pressure should be 55 psi and exhaust pressure should be no more tha like 2 lbs. Does that sound correct?

No MIL, but will check for codes too just to be sure.
Here, AutoZone will do a code check and if you have O'Reilly's Auto Parts near you, I think they do that, too. Do you have any problems with fuel quality, where you are? I have no idea what the exhaust pressure should be.
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