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Acura TSX k24 a3, positive short and long trim fuel value

  • raresvintea
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14 Feb 2019 05:10 #27031 by raresvintea
Hello. I am in europe, and i have a honda accord cl9 k24a3 that is very similar with acura tsx 1st gen in USA.
My car is fitted with LPG and from the begging its has positive stft and ltft
On idle short was 11.7 and long was 9.4
On 2600 rpm short 7.8 and log 7.8
On 4000 rpm short 4.7 and long 7.8

Sometimes on LPG it gaved me p0171 and i have dissabled the system
I have replaced
-pcv valve
-exhaust manifold donut, it's before o2 sensor
-o2 sensor with brand new
-fuel filter from the tank and check fuel pressure 3.6 bar(normal)
-i have check visual intake tube and no cracks
-blocked the vacuum tube that goes to front mount engine support
-block vacuum pipes to brake booster and evap system.

Checked for vacuum leaks with brake cleaner spray and no leak found

I want some suggestions. Car has fully electronic throttle body.

What i'm thinking
-maybe the butterfly from throttle body isn't sealing, but on HDS(honda diag scanner) it shows at idle 10-14% throttle position. maybe to reseal with special spray?\
-any suggestions please

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14 Feb 2019 11:32 #27039 by chief eaglebear
Replied by chief eaglebear on topic Acura TSX k24 a3, positive short and long trim fuel value
Ok so sometimes it's throwing a po171 intermittent po171 eh mate let's get to the problem here huaahhh is that a lean condition intermittent hmmmmm any other codes in other modules and are we sure no vacuum leaks I think sometimes we have to smoke exhaust and intake to rule out any vacuum leaks let's narrow these symptoms down a little I'ma beginner so be gentle lol

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14 Feb 2019 12:15 #27040 by raresvintea
i will try to find a service that i can smoke test the system.
There are no error codes present, just higher short and long trim.

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