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Dwebb76
Novice
Jun 6, 2016, 3:31 PM
Post #1 of 11
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2004 Tahoe Help!!
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Hi, I just bought a 2004 Chevy Tahoe, 4.8l, V8,with 202k and some change on it. Or is throwing a random misfire and a cylinder 6 misfire code. Replaced plugs & wires and #6 coil. Injectors are all firing. Checked for vacuum leaks and replaced Mass air flow sensor. Doesnt want to go over 30. Trans shifts fine.
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kev2
Veteran
Jun 6, 2016, 3:44 PM
Post #2 of 11
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Re: 2004 Tahoe Help!!
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tell us the code numbers.
I am assuming you do NOT have a scanner - correct?
check fuel pressure- post the PSI reading. Then with KOEO observe pressure drop
MIght want to do a compression test esp #6 and adjacent cylinders.
Plugs - use ONLY AC Delco or expect a misfire. how does #6 plug look WET,black, dry, tan?
do you have a vacuum gauge to check for excess exhaust back pressure?
Add a can/bottle of 'seafoam' or 'techron' fuel system cleaner
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Discretesignals
Ultimate Carjunky
/ Moderator
Jun 6, 2016, 3:54 PM
Post #3 of 11
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Re: 2004 Tahoe Help!!
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Why would you buy a truck with that kind of mileage that has a bunch of misfire issues? I say do a compression test first to be sure you don't have any mechanical issues.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jun 6, 2016, 3:55 PM)
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Dwebb76
Novice
Jun 6, 2016, 4:11 PM
Post #4 of 11
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Re: 2004 Tahoe Help!!
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Codes are po301 & po600
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Dwebb76
Novice
Jun 6, 2016, 4:14 PM
Post #5 of 11
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Re: 2004 Tahoe Help!!
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Did not have misfire issues when bought. Did a tune up & issues came up. Originally thought it needed a transmission, but it was just a filter/fluid issue.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jun 6, 2016, 4:18 PM
Post #6 of 11
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Re: 2004 Tahoe Help!!
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You sure that is a P0600? You should still perform a compression test just to see what kind of shape the engine is in.
Does the engine feel like it is bogging out when it won't go over 30 or is the engine revving up, but the transmission isn't shifting to the next gear? What was wrong with the transmission that the fluid/filter change corrected?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jun 6, 2016, 4:22 PM)
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Dwebb76
Novice
Jun 6, 2016, 4:22 PM
Post #7 of 11
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Re: 2004 Tahoe Help!!
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Yes, positive. I bought cheap plugs...will redo those. And compression test next. What should compression be at?
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kev2
Veteran
Jun 6, 2016, 4:23 PM
Post #8 of 11
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Re: 2004 Tahoe Help!!
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no issue before your 'tune up" so recheck your work...
Are you sure of P0600 ?
those codes do not indicate cylinder #6 -
P0301 is cylinder #1
P0600? IDK confirm
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Dwebb76
Novice
Jun 6, 2016, 4:26 PM
Post #9 of 11
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Re: 2004 Tahoe Help!!
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Yes it is bogging badly. No engine rev or shifting issues. That's what previous owner thought was issue, decided to check filter and fluid before changing transmission out. All service records came with vehicle, I am 3rd owner.
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Dwebb76
Novice
Jun 6, 2016, 4:31 PM
Post #10 of 11
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Re: 2004 Tahoe Help!!
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Will check again, and change plugs. And let you know. Just racking my brain trying to get it running right. Thanks for the help, I'll get back to you when I get those things checked out.
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