Choking at Idle | Ford Escort Owners Association (FEOA)

Choking at Idle

Discussion in '2nd Gen 1991-1996 1.9L SOHC' started by Mjestes17, Jan 4, 2020.

  1. Mjestes17

    Mjestes17 FEOA Member

    Messages:
    11
    Likes Received:
    0
    Trophy Points:
    1
    Anyone know why my 93 1.9L is idling this rough (videos posted below)?
    I bought it for $100 off a friend because he couldn't figure it out. I've replaced spark plugs (brand new) and I pulled the MAF/Intake amd the IACV off a 94 from a junkyard that only had 34k miles on it. Been trying to chase vacuum lines and even replaced the PCV but no luck so far.
    When I unplug the MAF sensor it dies as it should.
    The videos show the voltage across the IACV when its warm and I believe they're below normal but it's nearly a brand new IACV.
    Also, when I performed the self-test to try to get codes, jumping the STI and all that made the car flash randomly and would even engage the clutch fan. Really weird stuff!
    Any help is appreciated. Thanks guys, here are the links to the videos







  2. denisond3

    denisond3 Moderator Staff Member

    Messages:
    9,933
    Likes Received:
    2,696
    Trophy Points:
    563
    Location:
    south TX or northern VA
    Im interested, as one of my 94LX Escorts has such a bad idle, that it will die at most stop lights. This started happening on a long drive, and got progressively worse. I changed the usual stuff, including the fuel pressure regulator, the IACV, the PCV valve, and the EGR valve. (I know 93's dont have EGR valves unless they were for the California market.)
    I will be measuring the signal to the IACV when I get back to the car in the spring. It gets 12 volts to one of its wires, and should have about a 5 volt square wave at about 1kilo-herz to the other wire. Changing the duty cycle moves the IACV more open or closed.
  3. zzyzzx

    zzyzzx FEOA Member

    Messages:
    14,728
    Likes Received:
    1,100
    Trophy Points:
    463
    Location:
    Baltimore, MD USA
    Did you replace the vacuum lines that go to the charcoal canister?
    You really won't even see those unless you remove the air intake box that houses the air filter. They carry fuel vapor and rot from the inside. I've replaced mine twice so far.
    Check the PCV elbow. Those also collapse and leak.
  4. Mjestes17

    Mjestes17 FEOA Member

    Messages:
    11
    Likes Received:
    0
    Trophy Points:
    1
    I'll have to check that out. Can you send me a pic of it?
  5. zzyzzx

    zzyzzx FEOA Member

    Messages:
    14,728
    Likes Received:
    1,100
    Trophy Points:
    463
    Location:
    Baltimore, MD USA
  6. Mjestes17

    Mjestes17 FEOA Member

    Messages:
    11
    Likes Received:
    0
    Trophy Points:
    1
    Right I know of the PCV, I said I replaced it. I found the new elbow had actually split open so I replaced it with new vacuum line and nothing has changed. On start-up it reves high near 3000RPM and finally drops back to about 1500RPM. When accelerating, it stays at 1500-1700RPM when I let off the gas and even when I come to a stop. I have to put it in neutral to get the RPM to come back to idle (almost) and then it starts to choke and lope like it's cammed. Any idea?

Share This Page