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.

Chevy 350 starts rough, check engine light

Discussion in 'The Garage' started by bud991649, Dec 28, 2004.

  1. bud991649

    bud991649 Registered Member

    Joined:
    Dec 28, 2004
    Posts:
    7
    Likes Received:
    0
    Location:
    South Florida
    Hi All! I ahve a 1992 GMC K2500 with TBI 350. Sometimes when I start the truck it starts real rough and idles hi/low ( like it's trying to die) for about 10-20 seconds. Then the check engine light comes on and it seems to run OK. The injectors are definitly spraying fuel. After a few starts it usually stops. Any ideas?
     
  2. tunedportk5

    tunedportk5 1/2 ton status

    Joined:
    Jul 13, 2004
    Posts:
    371
    Likes Received:
    0
    Location:
    Union City, CA
    If you pull the code for that check engine light it probably will tell you the problem
     
  3. bud991649

    bud991649 Registered Member

    Joined:
    Dec 28, 2004
    Posts:
    7
    Likes Received:
    0
    Location:
    South Florida
    I'm sure, but unfortunatly I don't have a reader, was hoping someone might have an idea with the symptoms.
     
  4. dheavychevy38

    dheavychevy38 1/2 ton status Premium Member

    Joined:
    Jan 6, 2003
    Posts:
    1,003
    Likes Received:
    1
    Location:
    Algonquin,illinois
    not sure if it will work on that year but on my 89 k5 you can use a paper clip in the a@b terminal and count the light flashing and that will be your code
     
  5. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

    Joined:
    Jan 27, 2003
    Posts:
    3,254
    Likes Received:
    0
    Location:
    Castro Valley, CA
    Jump the to terminals in the upper right. IAC, EGR?
     
  6. tunedportk5

    tunedportk5 1/2 ton status

    Joined:
    Jul 13, 2004
    Posts:
    371
    Likes Received:
    0
    Location:
    Union City, CA
    you do the papaer clip thing and turn the key on and the check engine light will start blinking codes it should start with a 12 three times and then what ever set your light off that code will flash there might be a few each code will blink three times then the next and then it will start over at 12 again
     
  7. bud991649

    bud991649 Registered Member

    Joined:
    Dec 28, 2004
    Posts:
    7
    Likes Received:
    0
    Location:
    South Florida
    Thanks for that info everyone, that sure is usefull. I an getting booth a code 33 and code 59. Anyone know what these codes are for?
     
  8. tunedportk5

    tunedportk5 1/2 ton status

    Joined:
    Jul 13, 2004
    Posts:
    371
    Likes Received:
    0
    Location:
    Union City, CA
    well 33 is for MAP sensor- leaking or restricted vacuum hoses;poor elecrical connection' open or short in circuit; defective MAP sensor; defective ECM. but the 59 it don't show is that one right
     
  9. bud991649

    bud991649 Registered Member

    Joined:
    Dec 28, 2004
    Posts:
    7
    Likes Received:
    0
    Location:
    South Florida
    That is definitly what it is reading, it blinks once, then short pause, then blinks twice.. does this 3x. Then blinks 3 times, short pause, the blinks 3 times again. 3x for that also, then 5 blinks, short pause, and 9 blinks, 3x. Th code 33 could be for a cloged PCV valve? I noticed some oil around the TB.
     
  10. tunedportk5

    tunedportk5 1/2 ton status

    Joined:
    Jul 13, 2004
    Posts:
    371
    Likes Received:
    0
    Location:
    Union City, CA
    you could do a google search for 59
     
  11. bud991649

    bud991649 Registered Member

    Joined:
    Dec 28, 2004
    Posts:
    7
    Likes Received:
    0
    Location:
    South Florida
    thanks... code 59 is: Transmission code - TTS low temperature (sensor or signal wire open). The engine trouble must be the MAP sensor, I will try to track that down, thanks for all your help.
     
  12. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,980
    Likes Received:
    189
    Location:
    Roy WA
    If there is someone here that is nice, perhaps they will scan or post the service manual troubleshooting flow chart for your error codes. Will save you some money in parts, thats for sure.

    The service manual is a very valuable tool if you can swing buying one.
     

Share This Page