Truck wont rev much past 2k rpm no codes

johnny89345

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Nov 29, 2024
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My lbz has been acting up the last few weeks. It was breaking up in the upper rpms a few weeks ago, I fixed a leak at the filter housing with a housing delete kit. Then a week or so goes by and my truck doesn't want to rev much past 2k rpms. Sometimes if I stay on the throttle it'll rev up. Most of the time won't. While it's acting up I check rail vs desired pressure with my efilive and it seems to be on the money. I have no codes. What do you guys recommend. Btw the truck has a rail plug/fitting, full hsp kit, full exhaust, 66mm ddp turbo, ad165 lift pump, and a ddp tune.
 

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2004LB7

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Probably going into limp mode but codes are turned off. Makes diagnose difficult

MAF seems low for that RPM
 

Bdsankey

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I'm sorry I'm doing my best taking pics as I drive. How do I data log? And no haven't spoke to my tuner yet.

This should help.


Then, when you need to pull the log files off you can follow this link. Compress the log(s) into a .zip file and you can attach here no problem.
 

johnny89345

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The site won't let me upload a data log. It says the file doesn't have an allowed extension. I tried a new throttle pedal, maf, map. 10psi fuel pressure to rail, doesn't drop during rough running. Unplugged fpr and it spikes to just over 27k psi. What i did notice was some tranny fluid in the transmission plug in the through case harness connector. I cleaned it out with no immediate difference. It was recommended I replace that.
 

Cougar281

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The site won't let me upload a data log. It says the file doesn't have an allowed extension. I tried a new throttle pedal, maf, map. 10psi fuel pressure to rail, doesn't drop during rough running. Unplugged fpr and it spikes to just over 27k psi. What i did notice was some tranny fluid in the transmission plug in the through case harness connector. I cleaned it out with no immediate difference. It was recommended I replace that.
@Chevy1925 - James, why are efi log files not an allowed extension? I can't think of a valid reason to not allow them and require users to jump through hoops to work around that rule...
 

Chevy1925

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Oct 21, 2009
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This site has required you to put logs and tunes in .zip files long before i was here. You can also change the name of the extension to .pdf by saving it this way and it will post. Its not a site deal, it has to do with transferring of data to a program that can read it.

Aint nothin new lol
 
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Woody35

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Jan 4, 2013
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I would put the stock tune back on to see what you get for codes. Probably some egr codes will pop up but see if you have any others.
 

Cougar281

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Sep 11, 2006
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This site has required you to put logs and tunes in .zip files long before i was here. You can also change the name of the extension to .pdf by saving it this way and it will post. Its not a site deal, it has to do with transferring of data to a program that can read it.

Aint nothin new lol
I get that... And as the site owner, you could add the efi log extension as an allowed extension... While I'm not trying to suggest that this is the case here, some users aren't that savvy, and it doesn't help that windows, by default, hides recognized extensions... Simply adding the efilive log extension to the allowed list would make things simpler... I can't see a downside....
 
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2004LB7

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I get that... And as the site owner, you could add the efi log extension as an allowed extension... While I'm not trying to suggest that this is the case here, some users aren't that savvy, and it doesn't help that windows, by default, hides recognized extensions... Simply adding the efilive log extension to the allowed list would make things simpler... I can't see a downside....
There is probably a lot more going on then just clicking a check box or typing in a three letter extension into an allowable field. The server/site has to be able to read and transfer the content. Possibly do some virus scans and other items beyond what we know at ground level. The software is setup to be able to handle certain file types. Adding additional files is probably more involved then most of us know.

Right clicking and choosing "send to zip" is not very hard to do even for a technically challenged person. If you can manage an EfiLive file and upload it, then you can zip one too. If the owner says we need to zip the files then we need to zip the file
 

1FastBrick

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Dec 1, 2016
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There is probably a lot more going on then just clicking a check box or typing in a three letter extension into an allowable field. The server/site has to be able to read and transfer the content. Possibly do some virus scans and other items beyond what we know at ground level. The software is setup to be able to handle certain file types. Adding additional files is probably more involved then most of us know.

Right clicking and choosing "send to zip" is not very hard to do even for a technically challenged person. If you can manage an EfiLive file and upload it, then you can zip one too. If the owner says we need to zip the files then we need to zip the file
Ugh.. I don't want too go to school daddy.... My truck has a boo boo, Can't you just kiss it an make it better?