Hello, I’m located in Europe and I have a Honda Accord CL9 2008, like the Acura TSX in USA with K24a3(without egr and 190bhp) My car has aprox 160.000kn(120.000 miles) and i have an issue with positive short trim fuel and long trim fuel(sometimes p0171). My car has also LPG, and when car runs fine on lpg it’s still want to compensate in stfl and ltfl.
I’ve tried several items:
-sprayed brake cleaner on every hose to find a vacuum leak, no found, if i spray directly into intake immediately the values drop and goes negative
-make a profi valve adjustments
-block vacuum from brake booster and the pipe coming from purge valve
-block front mount engine support that is vacuum actuated
-check air valve that closes when antifreeze gets hooter
-replace fuel filter inside the tank
What to do next:
-check fuel pressure
-change the gasket between exhaust manifold and down pipe and then it comes lambda sensor, if it’s leaking it can give false readings?! but it’s no dark sports visible, like exhaust smoke
-change first lambda
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