dneu Posted July 30, 2023 Report Share Posted July 30, 2023 Pre-heating O2 sensor fault. The car run well, although i noticed higher consumption. Two more codes came on fuel pressure sensor and engine speed sensor. I finally decided to replace them. After I did it the car does not run. It starts an is running very rich, clouds of smoke and does not idle for more than a few seconds. Scanner does not show any other codes. If I disconnect MAF sensor the car idles much better. I check it with a scanner again. No DTC now. Previously randomly fuel pressure sensor (after I installed the new one. Update: I installed a new engine speed sensor - still no change. Trying everything I just disconnected the hose from charcoal canisters to intake manifold. (A horizontal fitting on the right side of the intake manifold - facing the engine). Checked the suction with a finger and suddenly engine idle smoothed to the normal, the engine reacted to the gas pedal much better then before and engine stopped smoking. Somehow I achieved almost ideal air-fuel mixture. As soon as I reconnect MAF sensor engine stalls. I switched the MAF sensor with a borrowed one - but no change. Where is the buried gremlin? Link to comment Share on other sites More sharing options...
dneu Posted August 1, 2023 Author Report Share Posted August 1, 2023 problem solved - a brand new fuel pressure sensor was faulty - fuel pressure 80psi. Link to comment Share on other sites More sharing options...
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