Krambo Posted August 16, 2007 Report Share Posted August 16, 2007 Are you around 25 or -25,...big difference there. AND, if you can, find out if it was LTFT or STFT. Quote Link to comment Share on other sites More sharing options...
fox_forma Posted August 16, 2007 Author Report Share Posted August 16, 2007 i think it was 25, but I cant read the graphs since I dont have EFlive, Maybe Justin will chime in as I sent him over some logging What is LTFT or STFT? Quote Link to comment Share on other sites More sharing options...
fox_forma Posted August 16, 2007 Author Report Share Posted August 16, 2007 pulled a few plugs, they werent white but more or less had some grey to them which I assume is on the verge of being lean. Here is a pic, kinda hard to really focus in on it but either way I'm going to switch out the plugs today. Quote Link to comment Share on other sites More sharing options...
Black2003SS Posted August 16, 2007 Report Share Posted August 16, 2007 LTFT = Long Term Fuel Trims STFT = Short Term Fuel Trims (I just learned this not too long ago myself...) They should be clearly labeled in your logs of your runs. Quote Link to comment Share on other sites More sharing options...
fox_forma Posted August 16, 2007 Author Report Share Posted August 16, 2007 not sure if this is correct but I downloaded EFILive so I could get a read out of the fuel trim, here is a shot of the 25 mark I hit. Quote Link to comment Share on other sites More sharing options...
.justin. Posted August 16, 2007 Report Share Posted August 16, 2007 It's his long term trims. They're moving in unison (signifies that it's not an exhaust problem) and raising as manifold pressure raises. If no leaks exist, then it's likely that he's having a fueling issue... quite possibly damaged FPR diaphragm. Quote Link to comment Share on other sites More sharing options...
fox_forma Posted August 16, 2007 Author Report Share Posted August 16, 2007 hey justin, any idea why the trims went a good amount higher with the stock pcm? Should i put the tuned pcm back in? Quote Link to comment Share on other sites More sharing options...
.justin. Posted August 16, 2007 Report Share Posted August 16, 2007 hey justin, any idea why the trims went a good amount higher with the stock pcm? Should i put the tuned pcm back in? It's a freak occurance... unless the condition is worsening as time goes on. None of the primary air/fuel injector tables are changed from the tuned to the stock one. Quote Link to comment Share on other sites More sharing options...
fox_forma Posted August 16, 2007 Author Report Share Posted August 16, 2007 ok cool, I just changed all the plugs out as well, they looked greyish so thats a lean condition I assume. Hopefully it was just a sealing problem with the intake tube or something that is corrected now. Gonna run the tank out then try to get some more logging next week. Oh and what is a FPR diaphragm? Quote Link to comment Share on other sites More sharing options...
04CHASE Posted August 16, 2007 Report Share Posted August 16, 2007 ok cool, I just changed all the plugs out as well, they looked greyish so thats a lean condition I assume. Hopefully it was just a sealing problem with the intake tube or something that is corrected now. Gonna run the tank out then try to get some more logging next week. Oh and what is a FPR diaphragm? fuel pressure regulator diaphram , it keeps the fpr from getting pregnant. lol it is what regulate the fuel pressure to you rrails , all of the unused fuel is then sent back to the tank( return fuel system) the fpr is on the fuel rail so if it is the problem it shouldnt be to hard to fix. unlike the 04+ returnless the fpr is in the tank. Quote Link to comment Share on other sites More sharing options...
.justin. Posted August 16, 2007 Report Share Posted August 16, 2007 FPR is in this picture, the circular object just south of center with a small vacuum line attached. Unhook that line and look for fuel... Quote Link to comment Share on other sites More sharing options...
fox_forma Posted August 16, 2007 Author Report Share Posted August 16, 2007 ok unhooked it and everything seems dry, good or bad thing? This is assuming I checked the right line. Is it the one in the pic that runs along the PCV valve line which is skinny? Quote Link to comment Share on other sites More sharing options...
.justin. Posted August 16, 2007 Report Share Posted August 16, 2007 yep, that's the line. When was the last time you ran the truck? Disconnect the line with it idling and see what effect that has... Do you have access to a fuel pressure gauge? Quote Link to comment Share on other sites More sharing options...
fox_forma Posted August 16, 2007 Author Report Share Posted August 16, 2007 no access to a fuel pressure gauge. What should it do when disconnected? Right now we have a sand storm blowing through so I cant do it just yet. Should some fuel or something came out when I disconnected with the truck off? Oh and should I pull both sides off or just the one? Quote Link to comment Share on other sites More sharing options...
fox_forma Posted August 17, 2007 Author Report Share Posted August 17, 2007 ok, fired the truck up and let it idle, pulled the line and basically idle dropped for a second and you could air being sucked in, or maybe out, only had a second to do it with all the sand and rain that was starting to come through. Reconnected it and everything seems normal for the most part. Anything else? Quote Link to comment Share on other sites More sharing options...
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