Bronco Forum - Full Size Ford Bronco Forum banner

vacuum leak

  1. Still high rev after putting in park!

    Noobie Bronco Tech Questions. Flame free zone!
    1990 XLT, 5.0 Symptom: High engine rev constant at (1400 rpm) when putting bronco back in park after driving, when driving idle is perfect at 650 rpm. After engine is warmed up though, stopped at a light i do get random surging small but noticeable and today it just stalled on me at a light...
  2. Can a leaking valve cover cause a vacuum leak?

    Noobie Bronco Tech Questions. Flame free zone!
    I have been chasing down an high idle problem that I have worked down to a vacuum leak. I did a smoke leak test and found that I have smoke coming out of the valve cover on the passenger side, in between the last 2 fuel injectors. I think its around the valve cover bolt but can't really tell...