High Negative LTFT

fenix-silver said:

It's been awhile since I've cleaned a MAF, but only use MAF cleaner and I don't think you should spray directly onto the metal wires. Might damage them depending on the spray pressure, but hopefully someone will correct me if I'm wrong.

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Yes. Only use a MAF Cleaner. The sensor wires is exactly what you want to spray, those are the only components measuring the air signal. They won't be damaged with spray from a can, just hit them about 2-3 times with the cleaner and attach it back. By the time the vehicle is started again everything will be well and dry.

fenix-silver said:

Is the post-cat O2 sensor even used for fueling in these cars? I know in my old WRX the rear O2 sensors were not utilized except to determine that the cat is working properly.

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They are not.

Jes_si562 said:

I have a cobra race Cai tsp stg 1 and my LFTS usually stays at -7 most It hits is -10 im pretty sure your okay man I would be worried if there some super high numbers it's all in the temp and fuel when I use she'll it stays at that I tried arco and it increased as well as my KC it hit .83 on map 3 switch back to shell

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Gas definitely has an impact on my K. CON but can’t remember if it impacted my trims too much.

For me, Chevron keeps my K CON value at 0.49 all the time while Shell will go up to 0.62

ne0guri said:

Gas definitely has an impact on my K. CON but can’t remember if it impacted my trims too much.

For me, Chevron keeps my K CON value at 0.49 all the time while Shell will go up to 0.62

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Shell and Chevron usually is the same for me when it comes to KC

Another update:

So I’m in California now and my fuel trims are now back to 0! Wooo all that worrying for nothing lol.

I wonder if it’s also simply because I drive locally 100% of the time in Vegas vs on the highway the whole way to California. My constant stop and go driving habits probably piss off my car... well at least I don’t have to worry about leaking injectors or anything crazy now!

Can’t wait to get back home now so I can change the transmission fluid to Amsoil.

ne0guri said:

Another update:

So I’m in California now and my fuel trims are now back to 0! Wooo all that worrying for nothing lol.

I wonder if it’s also simply because I drive locally 100% of the time in Vegas vs on the highway the whole way to California. My constant stop and go driving habits probably piss off my car... well at least I don’t have to worry about leaking injectors or anything crazy now!

Can’t wait to get back home now so I can change the transmission fluid to Amsoil.

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sorry if i'm bringin this up again, but exactly this happened to me this week...nothing crazy changed except the weather and my LTFT is at -10 to -15%...are you still getting this?

ShadowFiend said:

sorry if i'm bringin this up again, but exactly this happened to me this week...nothing crazy changed except the weather and my LTFT is at -10 to -15%...are you still getting this?

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My anecdotal observation is that LTFT will trend more negative in warmer weather. Especially with more stop-and-go (which will cause higher air temps). I wonder if you’ve had any different with the pandemic. I had the same fuel in my tank for two months whereas I would usually fill up every week. But I’m not driving for work. By the end of the tank I was getting higher negative trims.

WOPSiWOT said:

My anecdotal observation is that LTFT will trend more negative in warmer weather. Especially with more stop-and-go (which will cause higher air temps). I wonder if you’ve had any different with the pandemic. I had the same fuel in my tank for two months whereas I would usually fill up every week. But I’m not driving for work. By the end of the tank I was getting higher negative trims.

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would this number seem okay then? i'm so worried lol. but so far i'm not noticing any sudden changes in the way how the car drives so...