SnowyOwl
1st Gear Poster
Hi all. For the whole time I've owned this car I've experienced this interesting phenomena where I get very low idle RPM (~600rpm) during the first 3-5 minutes after I start the engine. After a few minutes, the rpm gets to around ~800. No misfiring as far as I can hear.
Additionally, during this phase, if I rev the engine up and let the gas pedal off "at once", the RPM will rapidly drop to zero and the engine stalls. Stalling occurs also if I change to D or R. If I let the gas pedal off "smoothly", the engine will barely stay on. I can rev the engine no problem as long as I don't drop the pedal too rapidly.
This happens whenever the engine is cold, summer and winter. This doesn't happen once the engine has warmed up.
I've replaced the T-shaped PCV hose behind the throttle body, and some other parts of the same line as well. To my understanding, another piece that could perhaps cause symptoms like this is the idle air control valve, but is there anything else I should check before replacing that? It seems it's not that fun of a part to change on this 1994 edition of the 4.6 engine.
Additionally, during this phase, if I rev the engine up and let the gas pedal off "at once", the RPM will rapidly drop to zero and the engine stalls. Stalling occurs also if I change to D or R. If I let the gas pedal off "smoothly", the engine will barely stay on. I can rev the engine no problem as long as I don't drop the pedal too rapidly.
This happens whenever the engine is cold, summer and winter. This doesn't happen once the engine has warmed up.
I've replaced the T-shaped PCV hose behind the throttle body, and some other parts of the same line as well. To my understanding, another piece that could perhaps cause symptoms like this is the idle air control valve, but is there anything else I should check before replacing that? It seems it's not that fun of a part to change on this 1994 edition of the 4.6 engine.
