73-87 Chevy _ GMC Trucks > Suburbans
90 Suburban runs rough and dies shortly after filling up.
Irish_Alley:
--- Quote from: 90_suburban on October 05, 2018, 11:17:33 PM ---
--- Quote from: Irish_Alley on October 05, 2018, 09:56:45 PM ---can you swap computers?
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Yeah I could pull the one out and swap it in the other and give it a try. I guess the promm is the same in both of them?
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cant say 100%, the only issue i can think of is the trans and thats because im not sure how the 700r4 works in relation with the ECU if at all. does it seam to run different depending on if the engine is hot or cold?
VileZambonie:
Holy parts cannon Batman.
Check your fuel pressure, check for spark, check for injector pulse. Don't keep swapping parts around as you may begin to compound issues before identifying your initial issue.
90_suburban:
--- Quote from: VileZambonie on October 06, 2018, 07:50:36 AM ---Holy parts cannon Batman.
Check your fuel pressure, check for spark, check for injector pulse. Don't keep swapping parts around as you may begin to compound issues before identifying your initial issue.
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I definitely have spark and fuel. With it cold this morning I was able to get it to run but wouldn’t hold a steady rpm. Once warmed up I couldn’t get it to start but for 1-2 seconds. I unplugged the idle air control motor and it fired right up and is idling at a high rpm but steady. I’ll test the iac motor and see if it is bad.
Not sure if it has anything to do with it or not but the brake light in the dash came on as well and hasn’t went back off. My thought is from braking with the engine off several times has caused it not sure what sets it.
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90_suburban:
After plugging the iac back up while it was running. It seems to be running perfect for now.
Screenshot of the live data at the moment. Seems to idle a little higher than before but could be the difference in the tbi units from the 88 to 90.
I turned it off and it started back up running normal still. Guess I’ll see how it goes.
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90_suburban:
Didn’t last long back to how it was I’ll get to testing the iac hopefully that’s all it is.
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