04-05-2021, 10:21 PM | #111 | |
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04-05-2021, 11:24 PM | #112 |
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Just recently popped up but I only switched to MHD like a month ago from Dinan stage 2, I'm kind of a nooby regarding this stuff so I'm not exactly sure how to record a log.
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04-06-2021, 07:52 PM | #113 | ||
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Yep.. since I flashed to stage 1 in thanksgiving. Shop found the lower intake tract was cracked, replaced that. Still had issues, found that my pcv valve is bad, replaced valve cover and everything seems ok. My ltft hangs around +12 - +15 while cruising and WOT drops to +10 - +11 Current mods are: Vsrf chargepipe Fmic Downpipe Afe drop in filter MHD stage 2+ I've swapped my maf sensor and there's no major change in anything. Next would be o2 sensor. If that doesn't fix it then I'm giving up. |
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04-07-2021, 11:56 AM | #114 | |
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What is your STFT during WOT? You need to add STFT and LTFT to get the full picture on your fuel trim health. If you're car is running smoothly and you have +-10% fuel trim, there isn't really anything to stress out about. And what are your fuel trims at idle? I don't think cruising fuel trim is a huge deal unless you're having issues while cruising.
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04-07-2021, 12:13 PM | #115 | |
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STFT is -21 during WOT At idle in D STFT is near 0 and LTFT is at +14 |
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04-07-2021, 12:22 PM | #116 |
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Anybody familiar with plug reading? I'm definitely not, but do those plus look fouled up? If they were new plugs and were already fouled up, is something going on in cylinders 4 @ 5 that caused them to foul so quickly? If so, I'd be concerned that the new plugs you just put in will foul up again soon. But I don't know, maybe those plugs have a normal amount of soot?
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04-07-2021, 12:23 PM | #117 | |
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Assuming your AFRs are good, your WOT fuel trims are ok. +10% LTFT / -21% STFT (-11% total) during WOT is ok. What makes you think new O2 sensors would be the next fix? Are you getting engine codes? How many miles does your car have? Maybe your injectors are just a little gunky, do you always use top tier fuel? Have you ever tried using one of those fuel system cleaners in a tank of gas like a bottle of Techron/Redline s-1/Liquimoly Jectron?
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04-07-2021, 12:29 PM | #118 |
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So at idle the DME is adding 14% extra fuel to hit stoich for the amount of air the cylinders are getting. Then at WOT it has to cut fuel, as it's getting too much fuel for the air in the cylinders. The intake tends to be under vacuum at idle, and obviously under pressure at boost. Maybe a boost leak somewhere letting in extra air at idle (sucking extra air in that wasn't counted by the MAF under vacuum), and leaking air out under boost (loosing air that was counted by the MAF)?
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04-07-2021, 12:47 PM | #119 | ||||
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And my car did trip a code last week for p0171 but it has yet to return. |
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04-07-2021, 12:58 PM | #120 | ||||
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04-07-2021, 01:35 PM | #121 | |
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04-07-2021, 02:46 PM | #122 |
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There's more vacuum at idle after the throttle body, but since you replaced your charge pipe, I'd start with checking those connections. When you put in your chargepipe, did you use the new o-ring that came with it for the connection to the throttlebody? Also at the other end of the CP, if the clamp is too loose it can leak, also if it's too tight the clamp can sqeeze the connection out of round and cause a leak. Also does your intercooler have the OEM style connections or hose clamps? Those connections could be leaky too.
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04-07-2021, 02:48 PM | #123 | |
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04-07-2021, 03:12 PM | #124 | ||
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For the intercooler, I used the oem connections with old o rings ( those are on order too). What should the fuel trim be at idle? |
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