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97 c-1500 solid/flashing engine light

Discussion in 'General Chevy & GM Tech Questions' started by GeoLow97, Nov 29, 2013.

  1. GeoLow97

    GeoLow97 Member

    I have a 97 GMC with the 5.0 5-speed. The other morning, we had a cold snap. The truck ran fine on the way to work. I let it idla for 10 minutes several hours later,everything was fine. Then in the afternoon, when I started the truck to go home from work, Igot a check engine light and the truck ran rough. Above about 2500 rpm, the light flashes. When I return to low rpm it comes on solid. I had it scanned and the #1 cylinder was misfiring. My guess, condensation in the distributor. I replaced cap,rotor,wires&plugs.They needed it BAD! Light went off .Truck smoothed out. About 3 minutes into test drive, it returned doing the exact same thing, but the truck is still running smooth. Any guesses?
  2. fugitive

    fugitive Member

    Having basically the same issue but my code is throwing a random cylinder mis-fire but she runs smooth as silk!
  3. Dana W

    Dana W Member 2 Years 100 Posts

    Sometimes the system has to go through a few start/stop cycles before the error code will clear out. The alternative is to have the code(s) erased, maybe at Autozone.
  4. GeoLow97

    GeoLow97 Member

    Curious...isn't it?! Alliance, eh? I'm from just north of Y-town! Moved down here bout 2 1/2 years ago. Gonna be 65 degrees today!

    - - - Updated - - -

    Thanks Dana! I'll give that a try..make sure all my connections are secure ...give it some time and if all else fails try a trip to Auto Zone!
  5. fugitive

    fugitive Member

    Yea! yea it's gonna warm up some today might reach 30 but Mounts playing so that a plus!
  6. poncho62

    poncho62 Member 1 Year 100 Posts

    Did you delete the code out of the ECM?...with OBD2, you do it with the scanner
  7. GeoLow97

    GeoLow97 Member

    Hmm, no , I did not. Feels like it is running slightly rough again. And the light is still switching from solid to flashing with an increase in engine speed and returning to solid whene it goes back to near idle. Did scan it again and the only thing I'm getting is #1 cylinder misfire. Think it may be the #1 port on the spider injector? I remeber a while back hearing of someone having similar troubles and it turned out to be some sensor or something on the fuel return line or possibly at the tank??? Regardless, I gave it a shot of Lucas injector cleaner. We'll see if it clears up. Never had much luck with stuff like that personally. Thank you all for the suggestions! Keep 'em coming!!!

    - - - Updated - - -

    Oh, and I was told that I can't replace 1 injector. That I have to replace the entire spider. At about $400! Is this true?
  8. BurbanMan

    BurbanMan Member 1 Year 500 Posts

    I'm betting the cylinder one spider leg went bad or came unplugged under the intake. We just went through this with my buddies 98 350
  9. GeoLow97

    GeoLow97 Member

    Thank you! Did he have to replace the whole kit and kaboodle or was he able to replace leg?

    By the way, nice Suburban! Had a '90 4WD loaded 1/2 ton. Loved it . Got nicknamed the "Magic Bus":rofl:
  10. BurbanMan

    BurbanMan Member 1 Year 500 Posts

    Depends in what setup you have. Most I've seen, the individual legs can be replaced. My buddies just came unplugged from the particular cylinder.

    Thanks. I can't wait to get it running lamborgeeties are getting old lol

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