Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

weird acting engine *problem still, no help yet*

Discussion in 'The Garage' started by BigOrange90Jimmy, Sep 2, 2002.

  1. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

    Joined:
    May 24, 2002
    Posts:
    2,923
    Likes Received:
    0
    Location:
    Wilmington, NC
    The TBI 350 in my 90 Jimmy is running kinda awkward. After I had it tuned up, it started running rough. When just plain riding around, it's fine. When I start it in the morning, or any time that the engine is cold, it runs like a 3-legged dog. It skips and is just plain rough, but if you rev it up one time, it runs fine. Also, when it's hot and when you're barely on the throttle, it starts sounding like it's got a big cam in it, kinda like it's loading up the cylinders before it fires. What is you take on this?
     
  2. 87sm465np208

    87sm465np208 1/2 ton status

    Joined:
    Aug 28, 2002
    Posts:
    1,114
    Likes Received:
    0
    Location:
    illinois
    Re: weird acting engine

    my 87' 350 tbi 149600 miles, its starting to not want to idle high in the morning when i turn it on anymore, and it will acctually stumble and die, and then i turn it on again, and hold it at about 1000, and then drive it around for a bit, it runs fine, i dont know, im as clueless as you /forums/images/icons/confused.gif
     
  3. lizard

    lizard 1/2 ton status

    Joined:
    May 11, 2002
    Posts:
    114
    Likes Received:
    0
    Location:
    Tallahassee, Florida
    Re: weird acting engine

    well you should check to see if the computer has any error codes set. also look at the IAC - prolly gots lots of carbon
     
  4. bryguy00b

    bryguy00b 3/4 ton status

    Joined:
    Apr 7, 2002
    Posts:
    5,587
    Likes Received:
    0
    Location:
    Rochester, N.Y
    Re: weird acting engine

    my dads 79 runs like that...but thats of course carburated so its proboly totaly different..
     
  5. 87sm465np208

    87sm465np208 1/2 ton status

    Joined:
    Aug 28, 2002
    Posts:
    1,114
    Likes Received:
    0
    Location:
    illinois
    Re: weird acting engine

    how do i get to the IAC valve?, and what do i use to clean it?
     
  6. 87sm465np208

    87sm465np208 1/2 ton status

    Joined:
    Aug 28, 2002
    Posts:
    1,114
    Likes Received:
    0
    Location:
    illinois
    Re: weird acting engine

    this is pissing me off
     
  7. ntaj*ep

    ntaj*ep 1/2 ton status

    Joined:
    Feb 4, 2002
    Posts:
    3,248
    Likes Received:
    1
    Location:
    Evergreen state
    Re: weird acting engine

    See if the water temp. sending unit is connected to the computer, or which sender goes to the computer. There maybe one for your gauge and one for the computer, or they maybe one in the same. Get a new one and reset the computer, either disconnect the batt. or the fuse for clearing codes. After that it will run fine when cold. /forums/images/icons/grin.gif If you have any other questions feel free to PM me. /forums/images/icons/grin.gif We can fix it together!!
     
  8. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

    Joined:
    May 24, 2002
    Posts:
    2,923
    Likes Received:
    0
    Location:
    Wilmington, NC
    Re: weird acting engine

    what? how the hell do i do that? i'm all thumbs when it comes to electronics
     
  9. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

    Joined:
    May 24, 2002
    Posts:
    2,923
    Likes Received:
    0
    Location:
    Wilmington, NC
    Re: weird acting engine

    i ask the question for me and somehow we're now talking about someone else's problems /forums/images/icons/mad.gif what gives?!
     
  10. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

    Joined:
    May 24, 2002
    Posts:
    2,923
    Likes Received:
    0
    Location:
    Wilmington, NC
    Re: weird acting engine

    how do i check for error codes. and i'm not paying the $45 an hour labor charge at the dealership
     
  11. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

    Joined:
    May 24, 2002
    Posts:
    2,923
    Likes Received:
    0
    Location:
    Wilmington, NC
    Re: weird acting engine

    ttt
     
  12. ntaj*ep

    ntaj*ep 1/2 ton status

    Joined:
    Feb 4, 2002
    Posts:
    3,248
    Likes Received:
    1
    Location:
    Evergreen state
    Re: weird acting engine

    Just go get a Haynes or Chiltons manual at the local parts store and it will tell you how to read/clear the codes. Go to the Dealer and ask them for the water temp sender for the ECU. Ask them where on your engine it goes and they will tell you. If you don't want to pay them get the part # from them and go get it somewhere else. The # will cross referance to other brands. The books will break it down for you, and you have this board as well. /forums/images/icons/grin.gif You can figure it out and have it running in no time. /forums/images/icons/grin.gif
     
  13. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

    Joined:
    May 24, 2002
    Posts:
    2,923
    Likes Received:
    0
    Location:
    Wilmington, NC
    Re: weird acting engine

    so that's all that's making my engine run like crap? just a water temp. sending unit?
     
  14. moneypit

    moneypit 1/2 ton status

    Joined:
    Sep 3, 2000
    Posts:
    1,382
    Likes Received:
    0
    Location:
    COLORADO
    Re: weird acting engine

    Got similar issues. Gettin pissed too. I am leaning towards a wire grounding.If the temp sender fixes your issue please let me know.TIA /forums/images/icons/smile.gif
     
  15. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

    Joined:
    May 24, 2002
    Posts:
    2,923
    Likes Received:
    0
    Location:
    Wilmington, NC
    Re: weird acting engine

    is your's "fool" injected too?
     
  16. jeffro

    jeffro 1/2 ton status

    Joined:
    Jul 2, 2002
    Posts:
    406
    Likes Received:
    0
    Location:
    Scurry, TX
    BigO',
    You need an EGR valve. That's what it sounds like to me. I've had to replace a couple on my wife's 93 GMC TBI.
     
  17. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

    Joined:
    May 24, 2002
    Posts:
    2,923
    Likes Received:
    0
    Location:
    Wilmington, NC
    thanks man. those are cheap and i actually know where they go /forums/images/icons/tongue.gif
     
  18. MontanaLifted

    MontanaLifted 1/2 ton status

    Joined:
    Aug 27, 2002
    Posts:
    171
    Likes Received:
    0
    Best bet when it comes to computers is check the codes. You gotta get a code reader and figure out how to "talk" to your engine. It will tell you what it needs.
    -Or you can chase your tail and replace every sensor until the problem goes away. After it's all said and done a cheap code reader would have been less expensive.
     
  19. ntaj*ep

    ntaj*ep 1/2 ton status

    Joined:
    Feb 4, 2002
    Posts:
    3,248
    Likes Received:
    1
    Location:
    Evergreen state
    OK, I am not a fan of "mine did this so it must be wrong with yours" I'm not flaming anyone, you just can't fix your rig like that. It will just cause more frustration, and cost you more money.
    You do need to read and decifer the code your truck is throwing at you. If you don't know/are unwilling to do it then you need to find someone that will do it or show you how to. After you find the code, you need to spend some time thinking about why it coded. I'll give you an example of this (a very common example at that)
    ***example has nothing to do with anything***You read codes, o2 sensor failure. You clear the code and drive the truck, it recodes, you find o2 failure again. OK we have an issue. You test the o2 sensor (reson why most people go to shop) it is testing faulty, why? Is the sensor bad? Or is there something else on the engine making it run rich or lean? HHHHMMMMMMMM /forums/images/icons/confused.gif***example has nothing to do with anything OVER***
    Now I will give more examples, there are about a dozen diffrent sensors that can make you engine run rough, hard start. Are you going to replace all of them?
    I say your water temp. sender for the ECU is faulty because you said it runs crappy, and is hard to start. The temp sender tells the ECU what temp. the motor is at. If faulty the rig will run rich, throw out a code (possibly o2, but who knows) and run like sh!t. /forums/images/icons/tongue.gif A stuck EGR valve would do the same, however it would not get better when warm, it would smooth out at cruise though. As my answer is speculation so is this. /forums/images/icons/laugh.gif Read the code. /forums/images/icons/grin.gif
     
  20. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

    Joined:
    May 24, 2002
    Posts:
    2,923
    Likes Received:
    0
    Location:
    Wilmington, NC
    good job on that post man. that's the best example I've read lately. i haven't started doing anything yet. i'm in Boone right now, so it'll probably be a while before i get to it. i guess i'll take it back to the guy who tuned it up. maybe he can tell me something.
     

Share This Page