Vortec 454/4L80e HD swapped 1999 Tahoe OBS

6.0 Carb Conversion or Stay EFI?

  • Carb Conversion

    Votes: 0 0.0%

  • Total voters
    3
  • Poll closed .

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bigfootchiro

bigfootchiro

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On my way home, truck is running like shit again. Have no power anywhere in the RPM range, just runs like a slug. Then the TC doesn’t wanna lockup, the about 2 miles down the road it kicks me down from 4th to 3rd! After that, it starts up shifting hard. Get to the gas station, turn off the truck, put some gas in, start it up, and it shifts fine. I’m at a loss... have no idea wtf is happening

:Angry::biggun::favorites68::wtf2:
 
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bigfootchiro

bigfootchiro

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Found this diagram. Looks like a common connection/ground with the MAF and the ICM. Potential suspect?

C6B6FFB5-343B-44F7-AA4C-D271EAB24D7D.gif
 

randeez

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are you using the stock o2 sensors? possible they arent pinned the same as the RV o2 sensors/ecm. could be back feeding something? i dont know what else you may have carried over and used or used your original sensors

cant really read that all that well
 
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bigfootchiro

bigfootchiro

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are you using the stock o2 sensors? possible they arent pinned the same as the RV o2 sensors/ecm. could be back feeding something? i dont know what else you may have carried over and used or used your original sensors

cant really read that all that well

That’s a good idea. I’ll check the pin out diagrams, but I think they are the same
 
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bigfootchiro

bigfootchiro

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Found a bad ground in the area of that diagram above. Just noticed it! Previous owner thought it would be a good idea to “hook” the wires together and put shrink wrap over it, but never heated it either to shrink around. Didn’t even twist the wires together. Throwing a new ground wire on and we will see how she runs

6525D4C6-B894-44BD-A5FA-0614A4C4515B.jpeg
 

Sam Harris

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Found a bad ground in the area of that diagram above. Just noticed it! Previous owner thought it would be a good idea to “hook” the wires together and put shrink wrap over it, but never heated it either to shrink around. Didn’t even twist the wires together. Throwing a new ground wire on and we will see how she runs

View attachment 225145
Sweet! Good find!
 

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