97 Ranger 4.0 5 speed shaking idle?

Discussion in '4.0 Engine' started by Crazed, Aug 30, 2012.

  1. Crazed

    Crazed New Member

    Okay so I thought I pinned down the issue with the upper intake manifold, it helped but it's not perfect. At idle it shakes pretty hardcore and almost sounds cammed. It's throwing an EVAP code, but everything seems to be in working order. It also smells a little rich out of the exhaust. I am at a total loss on this thing, I've been trying to fix it for months and part after part it gets a little bit better but still has a nasty shake and rough idle.

    So in short -
    Engine shakes
    Idles around 1250 sometimes clear down to 250
    Runs fine going down the road
    Sounds like it's cammed
    New upper intake and gaskets
    Newer DDTFD sensor (has a plug and two lines on side of upper intake)
    New coolant temp sensor

    Any help would be greatly appreciated.
    Last edited: Aug 30, 2012
  2. Ranger Forum Sign Up!

    Join RangerForum.com Today - It's Totally Free!

    Are you a Ford Ranger fan? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's a great place for Ford Ranger Fans to meet online.
    Once you join you'll be able to post messages, upload pictures of your Ford, and have a great time with other Ranger fans. Whether your an old timer or just bought your Ford you'll find that Ranger Forum is a great community to join. Best of all it's totally free!

    Join RnagerForum.com Today! JOIN FOR FREE

  3. Freemans 00

    Freemans 00 Active Member

    you check the vaccum hose? When thats loose or off itll shake bad and you will have a rough idle. Thats the only thing I know of.
  4. Brinker88

    Brinker88 Black sheep o' the family

    EGR valve sounds like it's sticking open, pumping raw exhaust in constantly.
  5. OP

    Crazed New Member

    The one off the brake booster?
  6. OP

    Crazed New Member

    How can I test this?

    Edit: I took the vac line off the EGR valve and it ran smooth as butter, so does that narrow it down?
    Last edited: Aug 30, 2012
  7. Brinker88

    Brinker88 Black sheep o' the family

    ...Yup. There's your problem.
  8. OP

    Crazed New Member

    It has a code for the canister purge valve, could it be like a chain reaction deal?
  9. Brinker88

    Brinker88 Black sheep o' the family

    It's your EGR valve. It's all connected in some odd way.

Share This Page