Would this also cause the negative Fuel Trim numbers I'm seeing? Wouldn't it be a positive number because the computer thinking it's got a lean condition? Thanks for your feedback.
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So my 8.1 has 130K, no mods. I'm the third owner, was sold to me out of Canada. Some good amount of rust on the undercarriage but nothing to alarming.
Recently I hear a loud Ticking/Rattle right at 1800RPM that will continue if I hold it there. I'm assuming it's on of two things, lose heat...
Bought it used, but I'm sure it's all stock, definitely no tune.
Correct me if I'm wrong but wouldn't a vacuum leak effect + FT, not - FT? A leak would increase the air mixture so the PCM would add(+FT) (enrich) because of a perceived lack of fuel for that condition. Am I wrong here?
Thanks...
I just had time to review 3 sets of live data across multiple RPM ranges I'm seeing a common thread.
The LTFT on both banks seems to me to be very lean at idle -9% to -14% (not getting enough air?) At higher RPM'S it reading +5% to +9% (getting to much fuel?) I was under the impression that...
Wondering what you all think would be a good tune for my gas hog. Not looking to brake the bank here. Tell me what you know about what the gains may be, thanks in advance.
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I can not for the life of me find one single vacuum line on my 2004 chevy 2500 8.1L, also has no EGR valve. I have an Idle bounce and am trying to figure out what the problem is. Took the fuel pressure at the rail. At KOEO was 55psi, KO pressure holds. At idle it reads able 63psi and will rise...
Does that data show on the scan tool or would I need to connect to the fuel rail? So I guess my answer would be I'm not sure. Could it only affect it at idle? Thanks for the quick response.
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Just recently replaced my alternator thinking because it's diodes were going bad was why my idle was rough. Turns out that was not the case. The voltage swing is gone (except now when the idle drops, so does the voltage) but the idle bounce is still there. (We're talking from 600, to 500 then...
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