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Thread: stumble in low rpm

  1. #1
    Join Date
    May 2011
    Posts
    42

    stumble in low rpm

    Hi there
    I am back with small prob.Stumble in the low rpmīs. The check engine starts to glow when it goes over 1200 rpm and goes of when it idle.There is no codes in the computer. The plugs are new and the gap is set the wires are driven only 3000 miles and they are Ford wires, new dis box, but the coilpack is used some time. I can make it go clean up the rpmīs if I am very smooth on the gas pedal but if I press to hard it stumbel, sometime very hard sometimes not.
    Have any thougts ?

    Palli

  2. #2
    Join Date
    Jul 2003
    Location
    Eastern (nee Western) PA
    Posts
    4,993
    Has this problem been going on ever since you changed the plugs and wires?

    If so, I would suggest checking the wire order at the coil pack. Here is a link to the proper order:

    http://www.sccoa.com/forums/showpost...63&postcount=2
    God bless!!!

    Former Birds:
    1990 SC auto ... red outside, gray cloth inside ... ~225,000 miles ... Sold.
    1990 SC auto ... white outside, gray cloth inside ... ~150,000 miles ... wrecked.
    1989 Base auto ... Crystal Blue metallic outside, dark blue inside ... ~160,000 miles ... Sold.

  3. #3
    Join Date
    Jul 2012
    Location
    Roseburg,OR
    Posts
    63
    Even tho the plugs are new, it could be possible one of them could have gotten cracked (during install).. my SC buddy had a similar issue that haunted him for months, changed about every part on the engine, finally found #1 plug with cracked ceramic. Stumbled bad when making the engine pull mainly when under boost. Hope you find it and it's cheap and easy fix

  4. #4
    Join Date
    Apr 2002
    Location
    Norcross, GA
    Posts
    3,326
    I would also check all of the intercooler tubing. You could have a leaky seal that would allow unmetered air to enter the system and cause it to go very lean. I've had this problem before.
    90 5spd, best ever E.T. 12.250
    best ever 1/4mi speed 112.89 mph
    Current dyno tune 383.54 rwhp 418.88 rwt

  5. #5
    Join Date
    May 2011
    Posts
    42
    Hi
    Thanks for these answers and I will check them what is still in my brain is about the light ????????????? Why does it come and go and no codes in the computer ??????????????

    Palli

  6. #6
    Join Date
    May 2011
    Posts
    825
    Just a thought but maybe test the battery and alternator. Its easy and quick to do.

  7. #7
    Join Date
    Jul 2012
    Location
    Roseburg,OR
    Posts
    63
    Weird issue with the light. I would be sure the ecm is getting a good ground thru the connector. Never heard of this before on any vehicle

  8. #8
    Join Date
    May 2011
    Posts
    42
    Hi there and happy new year
    I was thinking about this prob. I went over all connection when the car wood not start after I put the new engine in then I had huge prob when the car did not start. But better be save than sorry. So I went and check all the connection that I found and all good. But yesterday I heard like spark was going out somewhere so me and friend of mine looked in the dark for some light but did not see anything but we track the sound to the right front corner of the car?????????? is there something there that will make this problem ?????

    Palli

  9. #9
    Join Date
    Apr 2002
    Location
    Lakeville, MN
    Posts
    13,517
    You are sure that no codes are stored? It should store even intermittent issues. Check your wiring for your oxygen sensors. In particular make sure they are not grounding out on something. A problem in the wiring of the o2 sensors could lead to a engine stumble and a intermittent check engine light. Though a code should get stored.

  10. #10
    Join Date
    Jul 2003
    Location
    Eastern (nee Western) PA
    Posts
    4,993
    Quote Originally Posted by Icebird View Post
    Hi there and happy new year
    I was thinking about this prob. I went over all connection when the car wood not start after I put the new engine in then I had huge prob when the car did not start. But better be save than sorry. So I went and check all the connection that I found and all good. But yesterday I heard like spark was going out somewhere so me and friend of mine looked in the dark for some light but did not see anything but we track the sound to the right front corner of the car?????????? is there something there that will make this problem ?????

    Palli
    Maybe a relay in the IRCM (between the passenger headlight and the air filter box) is bouncing. Sounds like a loose connection is likely, and not allowing proper voltage to reach the relay and enable it to stay closed.
    God bless!!!

    Former Birds:
    1990 SC auto ... red outside, gray cloth inside ... ~225,000 miles ... Sold.
    1990 SC auto ... white outside, gray cloth inside ... ~150,000 miles ... wrecked.
    1989 Base auto ... Crystal Blue metallic outside, dark blue inside ... ~160,000 miles ... Sold.

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