Check to make sure your pop-up valve has not released (stuck open) and is dumping air out of the system. What do your spark plugs look like? Are they black at all (rich)? How about vacuum leaks, do you hear hissing from anywhere (move the lines around a bit to see if there is a change). Is it running at the correct RPM when it is cold?
- umm pop up valve is questionable. the lid is not touching the valve body. has been like this since I bought the car.
- as for spark plug, I just found out today I don't have long enough extension to clear the head and dizzy (OK, I don't have the proper tools, I have that tiny mastercraft home owner socket set) gonna buy one long extension tomorrow.
- I can't hear any hissing.
- it's some kind of vacuum leaks for sure because when the engine is cold vacuum reads at 14-16 in-Hg. Based on info on internet it should be around 21-22 in-Hg for 4 cyl engine. if I let go of the gas while driving I get 23 in-Hg. it doesn't idle properly when it's cold, it sits at 600 rpm and act like it has a lumpy cam. if I give it a gas quick, it sounds like it's gonna die -> it stumble then rev up (maybe it just a turbo car? it was like that with the old turbo).
I'm gonna get an injector cleaner and just dump it in the tank, see if it helps. Also, gonna get help from friend to diagnose this. Gonna get an oil change, as on this one website it's a possibility that make this, dirty oil (oil is black).
Engine hasn't been started in maybe almost 3 months until last saturday night. it fires OK and run fine, so we thought there is no problem. It was a warm day and we have no problem with the car at all.
Can dirty MAF causes this? how do you clean them properly?
Thanks a lot!